TEXAS INSTRUMENTS bq20z60-R1, bq20z65-R1 Technical data

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bq20z60-R1/bq20z65-R1

Technical Reference

Literature Number: SLUU386

January 2010

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Contents

1 Preface .............................................................................................................................. 7

1.1 Read This First .............................................................................................................. 7

1.2 Notational Conventions ..................................................................................................... 7

2 Detailed Description ............................................................................................................ 9

2.1 JEITA Temperature Ranges ............................................................................................... 9

2.2 1st Level Protection Features ............................................................................................ 10

2.2.1 Cell Overvoltage (COV) and Cell Undervoltage (CUV) ...................................................... 10

2.2.2 Charge and Discharge Overcurrent ............................................................................ 13

2.2.3 Short-Circuit Protection .......................................................................................... 18

2.2.4 Overtemperature Protection ..................................................................................... 19

2.2.5 Host Watchdog ................................................................................................... 21

2.2.6 AFE Watchdog .................................................................................................... 21

2.3 2nd Level Protection Features ........................................................................................... 21

2.3.1 2nd Level (Permanent) Failure Actions ........................................................................ 22

2.3.2 Time-Limit-Based Protection .................................................................................... 23

2.3.3 Limit-Based Protection ........................................................................................... 25

2.3.4 Clearing Permanent Failure ..................................................................................... 27

2.4 Gas Gauging ............................................................................................................... 27

2.4.1 Impedance Track Configuration ................................................................................ 27

2.4.2 Gas Gauge Modes ............................................................................................... 28

2.4.3 Qmax ............................................................................................................... 30

2.5 Charge Control ............................................................................................................. 32

2.5.1 Charge Control SMBus Broadcasts ............................................................................ 32

2.5.2 Cell Balancing ..................................................................................................... 32

2.5.3 Charge-Inhibit Mode ............................................................................................. 33

2.5.4 Charge-Suspend Mode .......................................................................................... 35

2.5.5 Charging and Temperature Ranges ........................................................................... 37

2.5.6 Precharge .......................................................................................................... 40

2.5.7 Primary Charge Termination .................................................................................... 41

2.5.8 Charging Faults ................................................................................................... 42

2.5.9 Discharge and Charge Alarms .................................................................................. 45

2.6 Discharge-Inhibit Mode ................................................................................................... 45

2.7 LED Display ................................................................................................................ 46

2.7.1 Display Activation ................................................................................................. 46

2.7.2 Display Configuration ............................................................................................ 47

2.7.3 Display Format .................................................................................................... 48

2.7.4 Permanent Failure Error Codes ................................................................................ 49

2.7.5 LED Current Configuration ...................................................................................... 50

2.8 Device Operating Mode .................................................................................................. 50

2.8.1 Normal Mode ...................................................................................................... 50

2.8.2 Battery Pack Removed Mode/System Present Detection ................................................... 51

2.8.3 Sleep Mode ........................................................................................................ 51

2.8.4 Wake Function .................................................................................................... 52

2.8.5 Shutdown Mode .................................................................................................. 53

2.8.6 Ship Mode ......................................................................................................... 53

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2.9 Security (Enables and Disables Features) ............................................................................. 53

2.10 Calibration .................................................................................................................. 56

2.10.1 Coulomb-Counter Dead Band ................................................................................. 56

2.10.2 Autocalibration ................................................................................................... 56

2.11 Communications ........................................................................................................... 56

2.11.1 SMBus On and Off States ...................................................................................... 56

2.11.2 Packet Error Checking .......................................................................................... 56

2.11.3 bq20z60-R1/bq20z65-R1 Slave Address .................................................................... 56

2.11.4 Broadcasts to Smart Charger and Smart Battery Host ..................................................... 57

A Standard SBS Commands .................................................................................................. 59

A.1 ManufacturerAccess (0x00) .............................................................................................. 59

A.1.1 System Data ...................................................................................................... 59

A.1.2 System Control ................................................................................................... 61

A.1.3 Extended SBS Commands ...................................................................................... 65

A.2 RemainingCapacityAlarm (0x01) ........................................................................................ 66

A.3 RemainingTimeAlarm (0x02) ............................................................................................. 66

A.4 BatteryMode (0x03) ....................................................................................................... 67

A.5 AtRate (0x04) .............................................................................................................. 68

A.6 AtRateTimeToFull (0x05) ................................................................................................. 69

A.7 AtRateTimeToEmpty (0x06) ............................................................................................. 69

A.8 AtRateOK (0x07) .......................................................................................................... 69

A.9 Temperature (0x08) ....................................................................................................... 70

A.10 Voltage (0x09) ............................................................................................................. 70

A.11 Current (0x0a) .............................................................................................................. 70

A.12 AverageCurrent (0x0b) ................................................................................................... 71

A.13 MaxError (0x0c) ............................................................................................................ 71

A.14 RelativeStateOfCharge (0x0d) ........................................................................................... 71

A.15 AbsoluteStateOfCharge (0x0e) .......................................................................................... 72

A.16 RemainingCapacity (0x0f) ................................................................................................ 72

A.17 FullChargeCapacity (0x10) ............................................................................................... 73

A.18 RunTimeToEmpty (0x11) ................................................................................................. 73

A.19 AverageTimeToEmpty (0x12) ............................................................................................ 73

A.20 AverageTimeToFull (0x13) ............................................................................................... 74

A.21 ChargingCurrent (0x14) ................................................................................................... 74

A.22 ChargingVoltage (0x15) .................................................................................................. 74

A.23 BatteryStatus (0x16) ...................................................................................................... 75

A.24 CycleCount (0x17) ......................................................................................................... 76

A.25 DesignCapacity (0x18) .................................................................................................... 76

A.26 DesignVoltage (0x19) ..................................................................................................... 76

A.27 SpecificationInfo (0x1a) ................................................................................................... 77

A.28 ManufactureDate (0x1b) .................................................................................................. 77

A.29 SerialNumber (0x1c) ...................................................................................................... 78

A.30 ManufacturerName (0x20) ............................................................................................... 78

A.31 DeviceName (0x21) ....................................................................................................... 78

A.32 DeviceChemistry (0x22) .................................................................................................. 79

A.33 ManufacturerData (0x23) ................................................................................................. 79

A.34 Authenticate (0x2f) ........................................................................................................ 80

A.35 CellVoltage4..1 (0x3c..0x3f) .............................................................................................. 80

A.36 SBS Command Values ................................................................................................... 80

B Extended SBS Commands .................................................................................................. 83

B.1 AFEData (0x45) ............................................................................................................ 83

B.2 FETControl (0x46) ......................................................................................................... 83

B.3 StateOfHealth (0x4f) ...................................................................................................... 84

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B.4 SafetyAlert (0x50) ......................................................................................................... 85

B.5 SafetyStatus (0x51) ....................................................................................................... 85

B.6 PFAlert (0x52) .............................................................................................................. 86

B.7 PFStatus (0x53) ........................................................................................................... 87

B.8 OperationStatus (0x54) ................................................................................................... 88

B.9 ChargingStatus (0x55) .................................................................................................... 88

B.10 ResetData (0x57) .......................................................................................................... 89

B.11 WDResetData (0x58) ..................................................................................................... 89

B.12 PackVoltage (0x5a) ....................................................................................................... 89

B.13 AverageVoltage (0x5d) ................................................................................................... 89

B.14 TS1Temperature (0x5e) .................................................................................................. 90

B.15 TS2Temperature (0x5f) ................................................................................................... 90

B.16 UnSealKey (0x60) ......................................................................................................... 90

B.17 FullAccessKey (0x61) ..................................................................................................... 90

B.18 PFKey (0x62) .............................................................................................................. 91

B.19 AuthenKey3 (0x63) ........................................................................................................ 91

B.20 AuthenKey2 (0x64) ........................................................................................................ 91

B.21 AuthenKey1 (0x65) ........................................................................................................ 91

B.22 AuthenKey0 (0x66) ........................................................................................................ 92

B.23 SafetyAlert2 (0x68) ........................................................................................................ 92

B.24 SafetyStatus2 (0x69) ...................................................................................................... 92

B.25 PFAlert2 (0x6a) ............................................................................................................ 93

B.26 PFStatus2 (0x6b) .......................................................................................................... 93

B.27 ManufBlock1..4 (0x6c..0x6f) ............................................................................................. 94

B.28 ManufacturerInfo (0x70) .................................................................................................. 95

B.29 SenseResistor (0x71) ..................................................................................................... 95

B.30 TempRange (0x72) ........................................................................................................ 95

B.31 LifetimeData1 (0x73) ...................................................................................................... 96

B.32 LifetimeData2 (0x74) ...................................................................................................... 97

B.33 DataFlashSubClassID (0x77) ............................................................................................ 97

B.34 DataFlashSubClassPage1..8 (0x78..0x7f) ............................................................................. 98

B.35 Extended SBS Command Values ....................................................................................... 98

C Data Flash ....................................................................................................................... 101

C.1 Accessing Data Flash ................................................................................................... 101

C.1.1 Data Flash Interface ............................................................................................ 101

C.1.2 Reading a SubClass ............................................................................................ 102

C.1.3 Writing a SubClass ............................................................................................. 102

C.1.4 Example .......................................................................................................... 102

C.2 1st Level Safety Class ................................................................................................... 103

C.2.1 Voltage (Subclass 0) ........................................................................................... 103

C.2.2 Current (Subclass 1) ............................................................................................ 108

C.2.3 Temperature (Subclass 2) ..................................................................................... 114

C.2.4 Host Comm (Subclass 4) ...................................................................................... 118

C.3 2nd Level Safety ......................................................................................................... 118

C.3.1 Voltage (Subclass 16) .......................................................................................... 118

C.3.2 Current (Subclass 17) .......................................................................................... 125

C.3.3 Temperature (Subclass 18) .................................................................................... 126

C.3.4 FET Verification (Subclass 19) ................................................................................ 130

C.3.5 AFE Verification (Subclass 20) ................................................................................ 131

C.3.6 Fuse Verification (Subclass 21) ............................................................................... 132

C.4 Charge Control ........................................................................................................... 134

C.4.1 Charge Temp Cfg (Subclass 32) .............................................................................. 134

C.4.2 Pre-Charge Cfg (Subclass 33) ................................................................................ 136

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C.4.3 Charge Cfg (Subclass 34) ..................................................................................... 137

C.4.4 Termination Cfg. (Subclass 36) ............................................................................... 143

C.4.5 Cell Balancing Cfg (Subclass 37) ............................................................................. 145

C.4.6 Charging Faults (Subclass 38) ................................................................................ 146

C.5 SBS Configuration ....................................................................................................... 152

C.5.1 Data (Subclass 48) ............................................................................................. 152

C.5.2 Configuration (Subclass 49) ................................................................................... 157

C.6 System Data .............................................................................................................. 160

C.6.1 Manufacturer Data (Subclass 56) ............................................................................. 160

C.6.2 Manufacturer Info (Subclass 58) .............................................................................. 161

C.6.3 Manuf. Block 2 (Offset 53) ..................................................................................... 161

C.6.4 Manuf. Block 3 (Offset 74) ..................................................................................... 162

C.6.5 Manuf. Block 4 (Offset 95) ..................................................................................... 162

C.6.6 Lifetime Data (Subclass 59) ................................................................................... 162

C.6.7 Lifetime Temp Samples (Subclass 60) ....................................................................... 169

C.7 Configuration ............................................................................................................. 169

C.7.1 Registers (Subclass 64) ........................................................................................ 169

C.7.2 AFE (Subclass 65) .............................................................................................. 178

C.8 LED Support .............................................................................................................. 179

C.8.1 LED Cfg (Subclass 67) ......................................................................................... 179

C.9 Power ...................................................................................................................... 184

C.9.1 Power (Subclass 68) ........................................................................................... 184

C.10 Gas Gauging .............................................................................................................. 188

C.10.1 IT Cfg (Subclass 80) .......................................................................................... 188

C.10.2 Current Thresholds (Subclass 81) .......................................................................... 191

C.10.3 State (Subclass 82) ........................................................................................... 193

C.11 Ra Table .................................................................................................................. 195

C.11.1 R_a0 (Subclass 88) ........................................................................................... 195

C.11.2 R_a1 (Subclass 89) ........................................................................................... 196

C.11.3 R_a2 (Subclass 90) ........................................................................................... 197

C.11.4 R_a3 (Subclass 91) ........................................................................................... 198

C.11.5 R_a0x (Subclass 92) .......................................................................................... 199

C.11.6 R_a1x (Subclass 93) .......................................................................................... 200

C.11.7 R_a2x (Subclass 94) .......................................................................................... 201

C.11.8 R_a3x (Subclass 95) .......................................................................................... 202

C.12 PF Status .................................................................................................................. 203

C.12.1 Device Status Data (Subclass 96) .......................................................................... 203

C.12.2 AFE Regs (Subclass 97) ..................................................................................... 208

C.13 Calibration ................................................................................................................. 208

C.13.1 Data (Subclass 104) .......................................................................................... 208

C.13.2 Config (Subclass 105) ........................................................................................ 210

C.13.3 Temp Model (Subclass 106) ................................................................................. 212

C.13.4 Current (Subclass 107) ....................................................................................... 213

C.14 Data Flash Values ....................................................................................................... 214

D Glossary ......................................................................................................................... 227

Index ....................................................................................................................................... 229

Contents SLUU386–January 2010

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1.1 Read This First

This manual discusses modules and peripherals of the bq20z60-R1/bq20z65-R1 and its use to build a complete battery pack gas gauge and protection solution.

1.2 Notational Conventions

The following notation is used when SBS commands and data flash values are mentioned within a text block:

• SBS commands are set in italic, e.g., Voltage

• SBS bits and flags are capitalized, set in italic and enclosed with square brackets, e.g., [LED1]

• Data flash values are set in bold italic e.g., COV Threshold

• All data flash bits and flags are capitalized, set in bold italic and enclosed with square brackets, e.g.,

[NR]

All SBS commands, data flash values and flags mentioned in a section are listed at the end of each section for reference.

The reference format for SBS commands is SBS:Command Name(Command No.)[Flag], or SBS:ManufacterAccess(0x00):Manufacturer Access Command(MA No.), for example:

SBS:Voltage(0x09), or SBS:ManufacterAccess(0x00):Seal Device(0x0020) The reference format for data flash values is DF:Class Name:Subclass Name(Subclass ID):Value

Name(Offset)[Flag], for example: DF:1st Level Safety:Voltage(0):COV Threshold(0), or DF:Configuration:Registers(64):Operation Cfg A(0)[LED1].

Chapter 1

SLUU386–January 2010

Preface

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SLUU386–January 2010 Preface

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Preface SLUU386–January 2010

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2.1 JEITA Temperature Ranges

The bq20z60-R1/bq20z65-R1 follows the JEITA guidelines which specify that charging voltage and charging current depend on the temperature. Temperature ranges are used for specifying both what the charging voltage and charging current should be.

There are three temperature ranges in which charging is allowed and they are defined as:

• T1 – T2: Low charging temperature range (T1 ≤ Temperature < T2)

• T2 – T3: Standard charging temperature range (T2 ≤ Temperature < T3)

• T3 – T4: High charging temperature range (T3 ≤ Temperature < T4) For added flexibility the standard temperature range is divided into 2 sub-ranges: standard range 1 and

standard range 2. An additional temperature value (T2a) is needed to specify these 2 ranges. These temperature ranges will be configurable in the gas gauge through the following data flash constants.

• JT1: Lower bound of low charging temperature range, in °C.

• JT2: Upper bound of low charging temperature range and lower bound of standard charging

temperature range 1, in °C.

• JT2a: Upper bound of standard charging temperature range 1 and lower bound of standard charging

temperature range 2, in °C

• JT3: Upper bound of standard charging temperature range 2 and lower bound of high charging

temperature range, in °C.

• JT4: Upper bound of high charging temperature range, in °C.

Chapter 2

SLUU386–January 2010

Detailed Description

Additional temperature parameters are defined for discharging.

• OT1D and OT2D: The temperature at which discharge will be suspended.

• Hi Dsg Start Temp: If the temperature is above Hi Dsg Start Temp when starting discharge then

discharge is not started.

The bq20z60-R1/bq20z65-R1 implements hysteresis for the temperature ranges above using the DF variable (Temp Hys). This variable specifies the number of degrees of hysteresis that should be used before switching charging temperature ranges.

Table 2-1. Temperature Ranges in bq20z60-R1/bq20z65-R1

Flag JEITA Temperature Range Charging Mode

TR1 Temp < JT1 Charge Suspend or Charge Inhibit TR2 JT1 < Temp < JT2 Low Temp Charge TR3 JT2 < Temp < JT2a Std Temp Charge 1 TR4 JT2a < Temp < JT3 Std Temp Charge 2 TR5 JT3 < Temp < JT4 High Temp Charge or Charge Inhibit TR6 JT4 < Temp Charge Suspend or Charge Inhibit

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1st Level Protection Features

The active temperature range is indicated using a set of flags. Since hysteresis is implemented for the temperature ranges, determining the active temperature range depends on the previous state, in addition to the actual temperature. These flags reside in a status register called TempRange.

2.2 1st Level Protection Features

The bq20z60-R1/bq20z65-R1 supports a wide range of battery and system protection features that are easily configured or enabled via the integrated data flash.

2.2.1 Cell Overvoltage (COV) and Cell Undervoltage (CUV)

The bq20z60-R1/bq20z65-R1 can detect cell overvoltage/undervoltage and protect battery cells from damage from battery cell overvoltage/undervoltage. If the over/undervoltage remains over an adjustable time period, the bq20z60-R1/bq20z65-R1 goes into overvoltage/undervoltage condition and switches off the CHG/DSG FET. The bq20z60-R1/bq20z65-R1 recovers from a cell overvoltage condition if all the cell voltages drop below the cell overvoltage recovery threshold. The bq20z60-R1/bq20z65-R1 recovers from cell undervoltage condition if all the cell voltages rise above the cell undervoltage recovery threshold. An additional charge current detection requirement for cell undervoltage recovery can be enabled by setting the CUV_RECOV_CHG bit in the Operation Cfg C register to a 1.

Per JEITA guidelines, the cell overvoltage threshold changes depending on the temperature. Three cell overvoltage thresholds are specified, one for each operating temperature range.

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Detailed Description SLUU386–January 2010

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CUV Alert

CUVCondition

Charging Allowed

DischargingDisabled

Stop andReset Timer

CellVoltagesWithinLimit

Any CellVoltage

4..1 ≤ CUVThreshold

All CellVoltage

4..1 > CUVThreshold AND

timer <

CUVTime

Any CellVoltage

4..1 ≤ CUVThreshold

AND

timer ≥ CUVTime

All CellVoltage

4..1 ≥ CUVRecovery

Start

Timer

COV Alert

COVCondition

ChargingDisabled

Discharging Allowed

Stop

& Reset Timer

Any CellVoltage4..1

≥ COVThreshold

All CellVoltage

4..1 < COVThreshold

ANDtimer

< COVTime

All CellVoltage

4..1 ≤ COVRecovery*

Stop andReset Timer

Wait

Any CellVoltage

4..1

≤ CUVThreshold

Start

Timer

Wait

Any CellVoltage

4..1

≥ COVThreshold

[CUV] SafetyAlert

[COV] SafetyAlert

[CUV] SafetyStatus

[COV] SafetyStatus

*TheappropriatCOVthresholdandrecoveryvaluesareused

dependingonthetemperaturerange.

( )ANDchargecurrentdetectedIF CUV_RECOV_CHG=1

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1st Level Protection Features

Figure 2-1. COV and CUV

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1st Level Protection Features

Condition: COV Alert COV Condition Normal CUV Alert CUV Condition Flags: BatteryStatus [TCA] [TDA], [FD]

SafetyAlert [COV] [CUV] SafetyStatus [COV] [CUV] OperationStatus [XDSG]

FET: Normal CHG FET disabled, Normal Normal DSG FET disabled,

SBS ChargingCurrent Charging 0 Charging Charging Charging algorithm Comman algorithm algorithm algorithm d:

ChargingVoltage Charging 0 Charging Charging Charging algorithm

The bq20z60-R1/bq20z65-R1 indicates cell overvoltage by setting the [COV] flag in SafetyAlert if any CellVoltage4..1 reaches or surpasses the cell overvoltage limit (LT COV Threshold, ST COV Threshold, or HT COV Threshold, depending on the current temperature range). The bq20z60-R1/bq20z65-R1 goes into cell overvoltage condition and changes the [COV] flag in SafetyAlert to the [COV] flag in SafetyStatus if any of CellVoltage4..1 stays above cell overvoltage for a minimum time period of COV Time. This function is disabled if COV Time is set to zero.

In cell overvoltage condition, charging is disabled and CHG FET and ZVCHG FET (if used) are turned off,

ChargingCurrent and ChargingVoltage are set to zero, [COV] flag in SafetyAlert is reset, [TCA] flag in BatteryStatus and [COV] flag in SafetyStatus are set.

The bq20z60-R1/bq20z65-R1 recovers from a cell overvoltage condition if all CellVoltages4..1 are equal to or lower than the appropriate COV Recovery limit (LT COV Recovery, ST COV Recovery, or HT COV

Recovery) . On recovery the [COV] flag in SafetyStatus is reset, [TCA] flag in BatteryStatus is reset, and ChargingCurrent and ChargingVoltage are set back to appropriate values per the charging algorithm.

In a cell overvoltage condition, the CHG FET is turned on during discharging to prevent overheating of the CHG FET body diode.

The bq20z60-R1/bq20z65-R1 indicates cell undervoltage by setting the [CUV] flag in SafetyAlert if any CellVoltage4..1 reaches or drops below the CUV Threshold limit during discharging. The bq20z60-R1/bq20z65-R1 goes into cell undervoltage condition and changes the [CUV] flag in SafetyAlert to the [CUV] flag in SafetyStatus if any of CellVoltage4..1 stays below CUV Threshold limit for a minimum time period of CUV Time. This function is disabled if CUV Time is set to zero.

In a cell undervoltage condition, discharging is disabled and DSG FET is turned off, the [CUV] flag in SafetyAlert is reset, the [TDA] and [FD] flags in BatteryStatus and the [CUV] flag in SafetyStatus are set.

The bq20z60-R1/bq20z65-R1 recovers from cell undervoltage condition if all CellVoltages4..1 are equal to or higher than CUV Recovery limit (and charge current detected if CUV_RECOV_CHG is set). On recovery, the [CUV] flag in SafetyStatus is reset, [XDSG] flag is reset, the [TDA] and [FD] flags are reset, and ChargingCurrent and ChargingVoltage are set back to appropriate values per the charging algorithm.

In cell undervoltage condition, the DSG FET is turned on during charging to prevent overheating of the DSG FET body diode.

Related Variables:

• DF:1st Level Safety:Voltage(0): LT COV Threshold(0)

• DF:1st Level Safety:Voltage(0): ST COV Threshold(4)

• DF:1st Level Safety:Voltage(0): HT COV Threshold(8)

• DF:1st Level Safety:Voltage(0):COV Time(12)

• DF:1st Level Safety:Voltage(0): LT COV Recovery(2)

• DF:1st Level Safety:Voltage(0): ST COV Recovery(6)

• DF:1st Level Safety:Voltage(0): HT COV Recovery(10)

• DF:1st Level Safety:Voltage(0):CUV Threshold(13)

• DF:1st Level Safety:Voltage(0):CUV Time(15)

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Table 2-2. COV and CUV

enabled during enabled during charge discharge

algorithm algorithm algorithm

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• DF:1st Level Safety:Voltage(0):CUV Recovery(16)

• DF:Charge Control:Charge Cfg(34):LT Chg Current1(2)

• SBS:ChargingCurrent(0x14)

• SBS:ChargingVoltage(0x15)

• SBS:BatteryStatus(0x16)[TCA],[TDA],[FD],[DSG]

• SBS:CellVoltage4(0x3c)

• SBS:CellVoltage3(0x3d)

• SBS:CellVoltage2(0x3e)

• SBS:CellVoltage1(0x3f)

• SBS:SafetyAlert(0x50)[CUV],[COV]

• SBS:SafetyStatus(0x51)[CUV],[COV]

• SBS:OperationStatus(0x54)[XDSG]

2.2.2 Charge and Discharge Overcurrent

The bq20z60-R1/bq20z65-R1 has two independent tiers (levels) of overcurrent protection for charge and discharge. These two tiers require the Current value to be greater than or equal to a programmed OC Threshold in either charge or discharge state for a period greater than OC Time Limit. If the OC Time Limit for any of the overcurrent protections is set to 0, that specific feature is disabled.

Table 2-3. Charge and Discharge Overcurrent

Protection OC Threshold OC Time Limit OC Recovery Threshold

Tier-1 [OCC] [OCC] Charge

Tier-2 [OCC2] [OCC2] Charge

Tier-1 [OCD] [OCD] Discharge

Tier-2 [OCD2] [OCD2] Discharge

Tier-3 AFE OC DsgRecovery for – [AOCD] Discharge Current Recovery Time

OC (1st Tier)Chg OC(1st Tier) Chg Time

OC (2nd Tier) Chg OC (2nd Tier) Chg Time

OC (1st Tier) Dsg OC (1st Tier) Dsg Time

OC (2nd Tier) Dsg OC (2nd Tier Dsg Time

AFE OC Dsg AFE OC Dsg Time

1st Level Protection Features

SafetyAlert SafetyStatus

Flag Flag

OC Chg Recovery

OC Dsg Recovery

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OC Alert

OCCondition

CurrentWithinLimit

Current

≥ OCThreshold

Current < OCThreshold

AND Timer < OCTimeLimit

Stopand Reset Timer

Start

Timer

Wait

Current

≥ OC Threshold

Current ≥ OCThreshold

AND Timer ≥ OC TimeLimit

[PRES]= 0

PackRemoved

Non-RemovableRecovery

Start

Timer

Wait

[NR] = 1 AND

AverageCurrent > OCRecovery

Threshold

AND Timer < CurrentRecovery

Time

[NR] = 1 AND

Current

≤ OCRecoveryThreshold

AverageCurrent

≤ OCRecoveryThreshold

[NR] = 0 AND [PRES

] transitionsfrom 1 to 0 ANDNon-removableConfiguration Conditionbitnotset

ReinsertBatteryPack [PRES

] transitionsfrom

0 to 1

AverageCurrent ≤ OCRecovery

Threshold

AND Timer ≥ CurrentRecovery

Time

SafetyAlertFlagset

SafetyStatusFlagset

Stopand Reset Timer

1st Level Protection Features

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Figure 2-2. OC Protection

For the first two tiers of overcurrent protection, the specific flag in SafetyAlert is set if Current exceeds the OC Threshold. The bq20z60-R1/bq20z65-R1 changes the specific flag in SafetyAlert to the specific flag in SafetyStatus if the Current stays above the OC Threshold limit for at least OC Time Limit period. This function is disabled if the OC Time Limit is set to zero. The SafetyStatus flag is reset if the Current falls below the OC Recovery Threshold.

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If the timer of any tier expires during charging, the CHG FET is turned off and ZVCHG FET (if used) is turned off. When this occurs, the OC Time Limit timer is started from 0, ChargingCurrent and ChargingVoltage are set to 0, the [TCA] flag in BatteryStatus is set, and the appropriate SafetyStatus tier flag is set.

However, when the bq20z60-R1/bq20z65-R1 has either of [OCC] or [OCC2] flags in SafetyStatus set, the CHG FET are turned on again during discharge (Current ≤ (–)Dsg Current Threshold). This prevents overheating of the CHG FET body diode during discharge. No other flags change state until full recovery is reached. This action is not affected by the setting of the [NR] bit.

If the timer of either of the first two tiers expires during discharging, the DSG FET is turned off and the ZVCHG FET (if used) is turned on. When this occurs, the OC Time Limit timer is started from 0, ChargingCurrent is set to Pre-chg Current, [XDSGI] flag is set, [TDA] flag is set, and [OCD] tier flag is set.

When the AFE detects a discharge-overcurrent fault, the charge and discharge FETs are turned off. When the bq20z60-R1/bq20z65-R1 identifies the overcurrent condition and the OC Time Limit timer is started from 0, [TDA] flag is set, ChargingCurrent is set to 0, and [AOCD] is set.

However, when the bq20z60-R1/bq20z65-R1 has any [OCD], [OCD2], [AOCD] set, the DSG FET is turned on again during charging (Current ≥ Chg Current Threshold). This prevents overheating of the discharge-FET body diode during charge. No other flags change state until full recovery is reached. This action is not affected by the state of [NR] bit.

1st Level Protection Features

Table 2-4. Overcurrent Conditions

Protection Flags FET

Tier-1 OC alert [OCC] Normal Charging Charging Charge algorithm algorithm

Tier-2 OC alert [OCC2] Normal Charging Charging Charge algorithm algorithm

Tier-1 OC alert [OCD] Normal Charging Charging Discharge algorithm algorithm

Tier-2 OC Alert [OCD2] Normal Charging Charging Discharge algorithm algorithm

Tier-3 OC [AOCD] [TDA] [XDSGI] CHG FET and DSG 0 Charging Discharge condition FET disabled algorithm

Conditio Charging Charging n Current Voltage

SafetyAlert SafetyStatus BatteryStatus OperationStatus

OC [OCC] [TCA] CHG FET disabled, 0 0 condition enabled during

discharge

OC [OCC2] [TCA] CHG FET disabled, 0 0 condition enabled during

discharge

OC [OCD] [TDA] [XDSGI] DSG FET disabled, Pre-chg Charging condition enabled during charge Current algorithm

OC [OCD2] [TDA] [XDSGI] DSG FET disabled, Pre-chg Charging condition enabled during charge Current algorithm

The bq20z60-R1/bq20z65-R1 can individually configure each overcurrent-protection feature to recover via two different methods, based on the state of the [NR] bit.

Standard Recovery, where [NR] = 0 and the overcurrent tier is not selected in Non-Removable Cfg register. When the pack is removed and reinserted, the condition is cleared. Pack removal and reinsertion is detected by a low-to-high-to-low transition on the PRES input. When the overcurrent tier is selected in Non-Removable Cfg, that particular feature uses the Non-Removable Battery Mode recovery.

Non-Removable Battery Mode Recovery, where [NR] = 1. The state of Non-Removable Cfg has no consequence. This recovery requires AverageCurrent to be ≤ the recovery threshold and for the OC Time Limit timer ≥ Current Recovery Time.

When a charging-fault recovery condition is detected, then the CHG FET is allowed to be turned on, if other safety and configuration states permit, [TCA] in BatteryStatus is reset, ChargingCurrent and

ChargingVoltage are set to the appropriate value per the charging algorithm, and the appropriate SafetyStatus flag is reset.

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Time

Discharge

Current

AFESCDsgCfg

Bit3–Bit0

AFE SC Dsg Cfg

Bit7–Bit 4

(0µs–915µs)

AFE

SCDSG

AFE

OCDSG

AFEOCDsg

AFE OC Dsg Time

(1ms–31ms)

SOCDsg

SOC Dsg Time

(1s–60s)

2ndLevel

SOCDSG

Level

OC (1stTier) Dsg

Level

OC (2ndTier) Dsg

OC (1stTier) Dsg

OC (2ndTier) Dsg

OC (1st Tier) Dsg Time

)

OC (2nd Tier) Dsg Time

)

GasGauge

SoftwareProtection

(1-secondupdateinterval)

AFE Hardware Protection

(1s–60s)

1st Level Protection Features

When a discharging-fault recovery condition is detected, the DSG FET is allowed to be turned on if other safety and configuration states permit, [TDA] flag is reset, ChargingCurrent and ChargingVoltage are set to the appropriate value per the charging algorithm and the [XDSG] and the appropriate SafetyStatus flag is reset.

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Figure 2-3. Overcurrent Protection Levels

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AOCDCondition

Charging Allowed DischargingDisabled

DischargeCurrentBelow

AFELimit

AFEdetectsovercurrent dischargefault

GasGaugeidentifiesovercurrentcondition

[PRES]= 0

PackRemoved

Non-RemovableRecovery

Start

Timer

Wait

[DSG] = 1 AND

AverageCurrent > AFEOC

DsgRecovery

AND Timer < Current

RecoveryTime

[DSG] = 1 AND AverageCurrent

≤ AFEOCDsgRecovery

AverageCurrent

≤ AFEOCDsgRecovery

[DSG] = 0 AND [PRES

] transitionsfrom 1 to 0 AND AOCDnotsetinnonremovableconfiguration

ReinsertBatteryPack [PRES

] transitionsfrom 0 to 1

AverageCurrent ≤ AFE

OCDsgRecovery

AND Timer ≥ Current

RecoveryTime

AFEFaultCondition

ChargingDisabled DischargingDisabled

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1st Level Protection Features

Figure 2-4. AFE Discharge Overcurrent Protection

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Related Variables:

• DF:1st Level Safety:Current(1):OC(1st Tier) Chg(0)

• DF:1st Level Safety:Current(1):OC(1st Tier) Chg Time(2)

• DF:1st Level Safety:Current(1):OC Chg Recovery(3)

1st Level Protection Features

• DF:1st Level Safety:Current(1):OC(1st Tier) Dsg(5)

• DF:1st Level Safety:Current(1):OC(1st Tier) Dsg Time(7)

• DF:1st Level Safety:Current(1):OC Dsg Recovery(8)

• DF:1st Level Safety:Current(1):OC(2nd Tier) Chg(10)

• DF:1st Level Safety:Current(1):OC(2nd Tier) Chg Time(12)

• DF:1st Level Safety:Current(1):OC(2nd Tier) Dsg(13)

• DF:1st Level Safety:Current(1):OC(2nd Tier) Dsg Time(15)

• DF:1st Level Safety:Current(1):Current Recovery Time(16)

• DF:1st Level Safety:Current(1):AFE OC Dsg(17)

• DF:1st Level Safety:Current(1):AFE OC Dsg Time(18)

• DF:1st Level Safety:Current(1):AFE OC Dsg Recovery(19)

• DF:Charge Control:Charge Cfg(33):Pre-chg Current (4)

• DF:Configuration:Registers(64):Operation Cfg B(2)[NR]

• DF:Configuration:Registers(64):Non-Removable Cfg(8)

• SBS:Current(0x0a)

• SBS:AverageCurrent(0x0b)

• SBS:ChargingCurrent(0x14)

• SBS:ChargingVoltage(0x15)

• SBS:BatteryStatus(0x16)[TCA],[TDA]

• SBS:SafetyAlert(0x50)

• SBS:SafetyStatus(0x51)

• SBS:OperationStatus(0x54)[XDSGI]

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2.2.3 Short-Circuit Protection

The bq20z60-R1/bq20z65-R1 short-circuit protection is controlled by the AFE, but is recovered by the gas gauge. This allows different recovery methods to accommodate various applications.

AFE charge short-circuit and discharge short-circuit protection are configured by the data flash AFE SC Chg Cfg and AFE SC Dsg Cfg registers, respectively.

When the AFE detects a short-circuit-in-charge or short-circuit-in-discharge fault, the charge and discharge FETs are turned off. The bq20z60-R1/bq20z65-R1 identifies the short-circuit condition (charge or discharge current direction) and the internal Current_Fault timer is started from 0, either [TCA] or [TDA] in BatteryStatus is set, ChargingCurrent and ChargingVoltage are set to 0 (only if in charge mode), and either [SCC] or [SCD] is set. If the short-circuit condition is in discharge, then [XDSG] flag is also set.

Each bq20z60-R1/bq20z65-R1 short-circuit protection feature can be individually configured to recover via two different methods, based on the setting of the [NR] bit.

Standard Recovery is where [NR] = 0 and the overcurrent tier is not selected in Non-Removable Cfg. When the pack is removed and re-inserted, the condition is cleared. Pack removal and re-insertion is detected by transition on the PRES input from low to high to low. When the overcurrent tier is selected in Non-Removable Cfg, that particular feature uses the Non-Removable Battery Mode recovery.

Non-Removable Battery Mode Recovery is where [NR] = 1. The state of Non-Removable Cfg has no consequence when the [NR] bit is set to 1. This recovery requires AverageCurrent to be ≤ the AFE SC Recovery threshold and for the internal Current_Fault timer to be ≥ Current Recovery Time.

When the recovery condition for a charging fault is detected, the CHG FET is allowed to be turned on if other safety and configuration states permit. The ZVCHG FET also returns to previous state. When this occurs, [TCA] in BatteryStatus is reset, ChargingCurrent and ChargingVoltage are set to the appropriate values per the charging algorithm, and the appropriate SafetyStatus flag is reset.

When the recovery condition for a discharging fault is detected, the DSG FET is allowed to be turned on if other safety and configuration states permit. The ZVCHG FET also returns to its previous state. When this occurs, [TDA] is reset, ChargingCurrent and ChargingVoltage are set to the appropriate value per the charging algorithm, and [XDSG] and the appropriate SafetyStatus flags are reset.

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Short Charging Charging Clear Circuit Current Voltage Threshold

Charge AFE SC Chg Cfg [SCC] SafetyStatus, CHG FET disabled, 0 0

Discharge AFE SC Dsg Cfg [SCD] SafetyStatus, DSG FET disabled, 0 per

Condition Flags set FET

[TCA] BatteryStatus enabled during discharge

[TDA] BatteryStatus, enabled during charge charging [XDSG]OperationStatus algorithm

Related Variables:

• DF:1st Level Safety:Current(1):AFE SC Chg Cfg(21)

• DF:1st Level Safety:Current(1):AFE SC Dsg Cfg(22)

• DF:1st Level Safety:Current(1):AFE SC Recovery(23)

• DF:Configuration:Registers(64):Operation Cfg B(2)[NR]

• DF:Configuration:Registers(64):Non-Removable Cfg(8)

• SBS:AverageCurrent(0x0b)

• SBS:BatteryStatus(0x16)[TCA],[TDA]

• SBS:SafetyStatus(0x51)[SCC],[SCD]

• SBS:OperationStatus(0x54)[XDSG]

2.2.4 Overtemperature Protection

The bq20z60-R1/bq20z65-R1 has overtemperature protection for both charge and discharge conditions with separate thresholds and alarms for the 2 temperature sensors TS1 and TS2.

The bq20z60-R1/bq20z65-R1 sets the overtemperature charging [OT1C] flag in SafetyAlert if the pack temperature measured on TS1 reaches or surpasses the OT1 Chg Threshold during charging. The bq20z60-R1/bq20z65-R1 changes [OT1C] in SafetyAlert to an overtemperature charging condition if the temperature on TS1 stays above the OT1 Chg Threshold limit for a time period of OT1 Chg Time. This function is disabled if OT1 Chg Time is set to zero. Similarly, the bq20z60-R1/bq20z65-R1 sets the overtemperature charging [OT2C] flag in SafetyAlert2 if the pack temperature measured on TS2 reaches or surpasses the OT2 Chg Threshold during charging. The bq20z60-R1/bq20z65-R1 changes [OT2C] inSafetyAlert2 to an overtemperature charging condition if the temperature on TS2 stays above the OT2 Chg Threshold limit for a time period of OT2 Chg Time. This function is disabled if OT2 Chg Time is set to zero.

If [OTFET] is set and the bq20z60-R1/bq20z65-R1 is in overtemperature charging condition, charging is disabled and the CHG FET is turned off, the ZVCHG FET is turned off if configured for use,

ChargingCurrent and ChargingVoltage are set to zero, the [OT1C] flag in SafetyAlert (or [OTC2] in SafetyAlert2) is cleared, and [TCA] in BatteryStatus and the [OT1C] flag in SafetyStatus (or [OTC2] in SafetyStatust2) are set.

The bq20z60-R1/bq20z65-R1 recovers from an [OT1C] condition if TS1Temperature is equal to or below the OT1 Chg Recovery limit. The bq20z60-R1/bq20z65-R1 recovers from an [OTC2] condition if

TS2Temperature is equal to or below the OT2 Chg Recovery limit. On recovery the [OT1C] flag in SafetyStatus (or [OTC2] flag in SafetyStatus2) is cleared, [OTA] and [TCA] in BatteryStatus are cleared, ChargingCurrent and ChargingVoltage are set back to their appropriate values per the charging algorithm,

and the CHG FET returns to its previous state.

1st Level Protection Features

Table 2-5. Short-Circuit Protection

AFE SC Recovery

In an [OT1C] or [OT2C] condition, the CHG FET is turned on during discharging to prevent overheating of the CHG FET body diode.

The bq20z60-R1/bq20z65-R1 sets the overtemperature discharging [OT1D] flag in SafetyAlert if the pack temperature measured on TS1 reaches or surpasses the OT1 Dsg Threshold during discharging. The bq20z60-R1/bq20z65-R1 changes [OT1D] SafetyAlert to an overtemperature discharging condition if the temperature on TS1 stays above the OT1 Dsg Threshold limit for a time period of OT1 Dsg Time. This function is disabled if OT1 Dsg Time is set to zero. Similarly, the bq20z60-R1/bq20z65-R1 sets the

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1st Level Protection Features

overtemperature discharging [OT2D] flag in SafetyAlert2 if the measured temperature on TS2 reaches or surpasses the OT2 Dsg Threshold during discharging. The bq20z60-R1/bq20z65-R1 changes [OT2D] in SafetyAlert2 to an overtemperature discharging condition if the temperature on TS2 reaches or surpasses the OT2 Dsg Threshold limit for a time period of OT2 Dsg Time. This function is disabled if OT2 Dsg Time is set to zero.

If [OTFET] is set and bq20z60-R1/bq20z65-R1 is in an overtemperature discharging condition, discharging is disabled and the DSG FET is turned off, ChargingCurrent is set to zero, the [OT1D] flag in SafetyAlert (or [OT2D] in SafetyAlert2) is cleared, [TDA] is set, [XDSG] flag is set and the [OT1D] flag in SafetyStatus (or [OT2D] flag in SafetyStatus2) is set.

The bq20z60-R1/bq20z65-R1 recovers from an [OT1D] condition if TS1Temperature is equal to or below the OT1 Dsg Recovery limit. The bq20z60-R1/bq20z65-R1 recovers from an [OT2D] condition if

TS2Temperature is equal to or below the OT2 Dsg Recovery limit. On recovery, [OT1D] flag in SafetyStatus (or [OT2D] flag in SafetyStatus2) is cleared, [TDA] and [OTA] are cleared, ChargingCurrent

is set back to the appropriate value per the charging algorithm, [XDSG] is cleared, and the DSG FET is allowed to switch on again.

In an overtemperature discharging condition, the DSG FET is turned on during charging to prevent overheating of the DSG FET body diode

Alert Threshold Overtemp Condition

Charge OT1 Chg Threshold, OT1 Chg Time, [OT1C], [OT1C] SafetyStatus Flag (or [OT2C]

OT2 Chg Threshold OT2 Chg Time [OT2C] SafetyStatus2 Flag) set, [TCA] and

Discharge OT1 Dsg Threshold, OT1 Dsg Time, [OT1D], [OT1D] SafetyStatus Flag (or [OT2D]

OT2 Dsg Threshold OT2 Dsg Time [OT2D] SafetyStatus2 Flag) set, [TDA] and

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Table 2-6. Overtemperature Protection

Alert Time SafetyAlert Recovery

Limit Flags set Threshold

[OTA] BatteryStatus set, OT1 Chg Recovery,

ChargingCurrent = 0, OT2 Chg Recovery

ChargingVoltage = 0, if [OTFET] is

set then CHG FET is turned off

[OTA] BatteryStatus set, OT1 Dsg Recovery,

ChargingCurrent = 0, OT2 Dsg Recovery

if [OTFET] is set then [XDSG] set

and DSG FET off

Related Variables:

• DF:1st Level Safety:Temperature(2):OT1 Chg Threshold(0)

• DF:1st Level Safety:Temperature(2):OT1 Chg Time(2)

• DF:1st Level Safety:Temperature(2):OT1 Chg Recovery(3)

• DF:1st Level Safety:Temperature(2):OT2 Chg Threshold(5)

• DF:1st Level Safety:Temperature(2):OT2 Chg Time(7)

• DF:1st Level Safety:Temperature(2):OT2 Chg Recovery(8)

• DF:1st Level Safety:Temperature(2):OT1 Dsg Threshold(10)

• DF:1st Level Safety:Temperature(2):OT1 Dsg Time(12)

• DF:1st Level Safety:Temperature(2):OT1 Dsg Recovery(13)

• DF:1st Level Safety:Temperature(2):OT2 Dsg Threshold(15)

• DF:1st Level Safety:Temperature(2):OT2 Dsg Time(17)

• DF:1st Level Safety:Temperature(2):OT2 Dsg Recovery(18)

• DF:Configuration:Registers(64):Operation Cfg B(2)[OTFET]

• SBS:TS1Temperature(0x5e)

• SBS:TS2Temperature(0x5f)

• SBS:ChargingCurrent(0x14)

• SBS:ChargingVoltage(0x15)

• SBS:BatteryStatus(0x16)[TCA],[TDA], [OTA]

• SBS:SafetyAlert(0x50)[OT1C],[OT1D]

• SBS:SafetyStatus(0x51)[OT1C],[OT1D]

• SBS:SafetyAlert2(0x68)[OT2C],[OT2D]

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• SBS:SafetyStatus2(0x69)[OT2C],[OT2D]

• SBS:OperationStatus(0x54)[XDSG]

2.2.5 Host Watchdog

The bq20z60-R1/bq20z65-R1 can be configured to require the host system to communicate with the battery periodically, else the battery disables charging and discharging. The Host Watchdog function is only active in Normal Power mode and is disabled if Host Watchdog Timeout is set to 0.

If the bq20z60-R1/bq20z65-R1 does not receive any valid SMBus communications for Host Watchdog Timeout period of time, the FETs are turned off, ChargingVoltage and ChargingCurrent are set to 0, [TCA] and [TDA] in BatteryStatus, [XDSG] in OperationStatus, and [HWDG] in SafetyStatus are all set.

For normal recovery to be achieved, normal SMBus communication must be resumed. When this occurs, the FETs are returned to the normal operating state, [TCA] and [TDA] in BatteryStatus are cleared,

ChargingCurrent and ChargingVoltage are set to the appropriate value per the charging algorithm, and [XDSG] and [HWDG] are cleared.

Related Variables:

• DF:1st Level Safety:Host Comm(3):Host Watchdog Timeout(0)

• SBS:ChargingCurrent(0x14)

• SBS:ChargingVoltage(0x15)

• SBS:BatteryStatus(0x16)[TCA],[TDA]

• SBS:SafetyStatus(0x51)[HWDG]

• SBS:OperationStatus(0x54)[XDSG]

2nd Level Protection Features

2.2.6 AFE Watchdog

The AFE automatically turns off the CHG FET, DSG FET and ZVCHG FET (if used), if it does not receive the appropriate frequency on the WDI input from gas gauge. The gas gauge has no warning that this is about to happen, but it can report the occurrence once the bq20z60-R1/bq20z65-R1 is able to interrogate the AFE.

When the XALERT signal is triggered, the bq20z60-R1/bq20z65-R1 reads the STATUS register of the AFE. If [WDF] is set, the bq20z60-R1/bq20z65-R1 also sets [WDF] in SafetyStatus, and periodic verification of the AFE RAM is undertaken. If verification of the AFE RAM fails, then the FETs turn off. Verification of the AFE RAM continues once every second. If the periodic verification passes, then [WDF] in SafetyStatus is cleared and the FETs return to normal operation.

Related Variable:

• SBS:SafetyStatus(0x51)[WDF]

2.3 2nd Level Protection Features

The bq20z60-R1/bq20z65-R1 provides features that can be used to indicate a more serious fault via the SAFE output. This output can be used to blow an in-line fuse to permanently disable the battery pack from charge or discharge activity.

If any PF Threshold condition is met, the appropriate PFAlert flag is set. If the PF Threshold condition is cleared within the PF time limit, the appropriate PFAlert flag is cleared. But if the PF Threshold condition continues over the PF Time Limit, then the bq20z60-R1/bq20z65-R1 goes into a permanent failure condition and the PFStatus flag is set, ad the PFlert flag is cleared.

When any NEW cause of a permanent failure is set in PFStatus function, the NEW cause is added to Saved PF Flags 1..2. This allows Saved PF Flags 1..2 to show ALL permanent failure conditions that have occurred.

On the first occasion of a permanent failure indicated by PFStatus or PFStatus2 change from 0x00, the PFStatus and PFStatus2 value is stored in Saved 1st PF Flags 1..2.

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NoPF

PF Alert

PFCondition

CHG, DSG, ZVCHGFET turns off. [TCA] flag set, [TDA] flag set. Data Flash Access Read-Only.

ChargingCurrent =0 ChargingVoltage =0

Ifbit in Permanent Fail Cfg or

is set,Permanent Fail Cfg2

drive SAFEpin high and [PF] flag in

or is setSafetyStatus SafetyStatus2

MonitoredValue ≥ PFThreshold

(MonitoredValue ≥ PFThreshold

AND Timer ≥ PFTimeLimit)

(AFE_Fail_Counter ≥ MaxErrorLimit )

PFKey to ManufacturerAccess

Stop and Reset Timer

Start

Timer

Wait

MonitoredValue

≥ PFThreshold

MonitoredValue < PFThreshold OR

AFE_Fail_Counter = 0

Start AFE

Timer

Decrement

AFE_Fail_

Counter

AFE Timer

≥ AFEFail

RecoveryTime

2nd Level Protection Features

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2.3.1 2nd Level (Permanent) Failure Actions

When the PFStatus or PFStatus2 register changes from 0x00 to indicate a permanent failure, then the

following actions are taken in sequence.

• CHG, DSG, and ZVCHG FETs are turned OFF.

• The [TCA] and [TDA] flags in BatteryStatus are set.

• Data flash write access is then disabled, but the data flash can be read.

• ChargingCurrent and ChargingVoltage are set to 0.

• The appropriate bit in Saved PF Flags 1 or Saved PF Flags 2 is set.

• If the appropriate bit in Permanent Fail Cfg is set, then 0x3672 is programmed to Fuse Flag, and the SAFE pin is driven and latched high. The [PF] flag in SafetyStatus is also set.

Related Variables:

• DF:Configuration:Registers(64):Permanent Fail Cfg 1(6), Permanent Fail Cfg 2(8)

• DF:PF Status:Device Status Data(96):Saved PF Flags 1(0), Saved PF Flags 2(2)

• DF:PF Status:Device Status Data(96):Fuse Flag(2)

• DF:PF Status:Device Status Data(96):Saved 1st PF Flags 1(32), Saved 1st PF Flags 2(34)

• SBS:ChargingCurrent(0x14)

• SBS:ChargingVoltage(0x15)

• SBS:BatteryStatus(0x16)[TCA],[TDA]

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Figure 2-5. 2nd Level Protection

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• SBS:SafetyStatus(0x51)[PF]

• SBS:PFStatus(0x53)

2.3.2 Time-Limit-Based Protection

The bq20z60-R1/bq20z65-R1 reports a 2nd level protection alert by setting the appropriate flag in the PFAlert or PFAlert2 register if the monitored value goes beyond the Protection Threshold. If the monitored value stays beyond the Protection Threshold over the Max Alert duration, the bq20z60-R1/bq20z65-R1 reports a 2nd level permanent failure, clears the appropriate PFAlert flag, and sets the appropriate PFStatus flag. See Table 2-7 for all Protection Thresholds and Max Alert durations.

Safety Overvoltage Protection— The bq20z60-R1/bq20z65-R1 monitors the individual cell voltages for

extreme values.

Safety Undervoltage Protection— The bq20z60-R1/bq20z65-R1 monitors the individual cell voltages for

extreme undervoltage values. Additionally, the bq20z60-R1/bq20z65-R1 can check cell voltages upon wakeup from shutdown mode while the charge and precharge FETs are turned off (to detect copper deposition).

Cell Imbalance Fault— Two methods of cell imbalance detection are implemented to provide CIM

detection both while charging and at rest. Two safety CIM flags are used, one for each detection methods. CIM_A reflects faults detected using the active CIM detection and CIM_R reflects faults detected using the at rest CIM detection. These flags and the bits associated with them are shown in Table 2-7.

2nd Level Protection Features

At Rest Detection

The at rest detection mechanism starts detection if all of following conditions are reached:

• Any (CellVoltage4..1) > Rest CIM Check Voltage

• |Current| ≤ Rest CIM Current for CIM Battery Rest Time

The bq20z60-R1/bq20z65-R1 sets [CIM_R] in PFAlert if the following condition is met:

• Max difference between any (CellVoltage4..1) > Rest CIM Fail Voltage

If the above condition remains active for more than Rest CIM Time, the device goes into permanent fail condition and moves [CIM_R] from PFAlert to PFStatus. Set Rest CIM Time to 0 to disable this CIM detection.

Active Detection

The active detection method during charging is activated when the following conditions are met:

• Any (CellVoltage4..1) > Active CIM Check Voltage

• Current ≥ Charge Threshold Current

The bq20z60-R1/bq20z65-R1 sets [CIM_A] in PFAlert2 if the following condition is met:

• Max difference between any (CellVoltage4..1) > Active CIM Fail Voltage

If above condition remains active for more than Active CIM Time, the bq20z60-R1/bq20z65-R1 goes into permanent fail condition and moves [CIM_A] from PFAlert2 to PFStatus2. Set Active CIM Time to 0 to disable this CIM detection.

2nd Level Protection IC Input— The PFIN input of the bq20z60-R1/bq20z65-R1 can be used to

determine the state of an external protection device such as the bq294xx. The bq20z60-R1/bq20z65-R1 watches for the PFIN pin being driven low by an external device.

Safety Overcurrent Protection— The bq20z60-R1/bq20z65-R1 monitors the current during charging and

discharging. The overcurrent thresholds and time limits can be set independently for charging and discharging.

Safety Overtemperature Protection— The bq20z60-R1/bq20z65-R1 monitors the pack temperature

during charging and discharging. The overtemperature thresholds and time limits can be set independently for charging and discharging. Additionally, the two temperature sensors (TS1 and TS2) have separate alarms, thresholds, and time limits.

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2nd Level Protection Features

Open Thermistor— The bq20z60-R1/bq20z65-R1 monitors the thermistor temperature readings and can

detect open thermistors by their unusually low readings. Two separate safety flags are used one for each thermistor.

Charge and Zero-Volt Charge FET Fault Protection— The bq20z60-R1/bq20z65-R1 monitors if there

is, at any time, an attempt to turn off the CHG FET or ZVCHG FET or if the CHG bit in the AFE OUTPUT register is set and the current still continues to flow.

Discharge FET Fault Protection— The bq20z60-R1/bq20z65-R1 monitors if there is, at any time, an

attempt to turn off the DSG FET or if the DSG bit in the AFE OUTPUT register is set and the current still continues to flow.

Fuse State Detection— The bq20z60-R1/bq20z65-R1 can detect if an attempt has been made to blow

the fuse, but the attempt has failed. The bq20z60-R1/bq20z65-R1 monitors if the Fuse Flag is set to 0x3672 and current is still flowing.

Protection Conditions Monitored Value PF Threshold PF Time Limit PFStatus Fail Cfg

Safety overvoltage – Voltage LT SOV Threshold, or SOV Time [SOV] [XSOV]

Safety undervoltage – Voltage SUV Threshold SUV Time [SUV] [XSUV] Cell imbalance fault Max difference Rest CIM Fail Voltage Rest CIM Time [CIM_R] [XCIM_R]

(at rest) Any

Cell imbalance fault Max difference Active CIM Fail Active CIM Time [CIM_A] [XCIM_A] (active) Any Voltage

2nd level protection – PFIN pin PFIN pin low PFIN Detect Time [PFIN] [XPFIN] IC input

Safety overcurrent Current> 0 Current SOC Chg SOC Chg Time [SOCC] [XSOCC] charge

Safety overcurrent Current< 0 Current SOC Dsg SOC Dsg Time [SOCD] [XSOCD] discharge

Safety Current > 0 TS1Temperature SOT1 Chg Threshold SOT1 Chg Time [SOT1C] [XSOT1C] overtemperature chg

Safety Current < 0 TS1Temperature SOT1 Dsg Threshold SOT1 Dsg Time [SOT1D] [XSOT1D] overtemperature dsg

Open thermistor 1 – TS1Temperature Open Thermistor Open Time [SOPT1] [XSOPT1] Open thermistor 2 – TS2Temperature Open Thermistor Open Time [SOPT2] [XSOPT2] Charge and zero-volt (CHG FET or ZVCHG Current FET Fail Limit FET Fail Time [CFETF] [XCFETF]

charge FET fault FET turn off attempt or

CHG Flag in AFE OUTPUT register set) and Current > 0

Discharge FET fault (DSG FET turn off (–)Current FET Fail Limit FET Fail Time [DFETF] [XDFETF]

attempt or DSG Flag in AFE OUTPUT register set) and Current < 0

Fuse state Fuse Flag = 0x3672 |Current| Fuse Fail Limit Fuse Fail Time [FBF] [XFBF]

Table 2-7. Time-Limit-Based 2ndLevel Protection

• Any (CellVoltage4..1) > Rest CIM

Check Voltage

• |Current| ≤ Rest CIM Current for CIM Battery Rest Time

• Any (CellVoltage4..1) > Active CIM

Check Voltage

• |Current| ≥

Charge Detection Current

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PFAlert Flag, Permanent Flag Flag

ST SOV Threshold, or HT SOV Threshold

CellVoltage4..1

TS2Temperature SOT2 Chg Threshold SOT2 Chg Time [SOT2C] [XSOT2C]

TS2Temperature SOT2 Dsg Threshold SOT2 Dsg Time [SOT2D] [XSOT2D]

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Related Variables:

• DF:2nd Level Safety:Voltage(16): LT SOV Threshold(0)

• DF:2nd Level Safety:Voltage(16): ST SOV Threshold(2)

• DF:2nd Level Safety:Voltage(16): HT SOV Threshold(4)

• DF:2nd Level Safety:Voltage(16): SOV Time(6)

• DF:2nd Level Safety:Voltage(16):SUV Threshold(7)

• DF:2nd Level Safety:Voltage(16):SUV Time(9)

• DF:2nd Level Safety:Voltage(16):Rest CIM Current(12)

• DF:2nd Level Safety:Voltage(16):Rest CIM Fail Voltage(13)

• DF:2nd Level Safety:Voltage(16):Rest CIM Time(15)

• DF:2nd Level Safety:Voltage(16):CIM Battery Rest Time(16)

• DF:2nd Level Safety:Voltage(16): Rest CIM Check Voltage(18)

• DF:2nd Level Safety:Voltage(16): Active CIM Fail Voltage(20)

• DF:2nd Level Safety:Voltage(16): Active CIM Time(22)

• DF:2nd Level Safety:Voltage(16): Active CIM Check Voltage(23)

• DF:2nd Level Safety:Voltage(16):PFIN Detect Time(25)

• DF:2nd Level Safety:Current(17):SOC Chg(0)

• DF:2nd Level Safety:Current(17):SOC Chg Time(2)

• DF:2nd Level Safety:Current(17):SOC Dsg(3)

• DF:2nd Level Safety:Current(17):SOC Dsg Time(5)

• DF:2nd Level Safety:Temperature(18):SOT1 Chg Threshold(0)

• DF:2nd Level Safety:Temperature(18):SOT1 Chg Time(2)

• DF:2nd Level Safety:Temperature(18):SOT2 Chg Threshold(3)

• DF:2nd Level Safety:Temperature(18):SOT2 Chg Time(5)

• DF:2nd Level Safety:Temperature(18):SOT1 Dsg Threshold(6)

• DF:2nd Level Safety:Temperature(18):SOT1 Dsg Time(8)

• DF:2nd Level Safety:Temperature(18):SOT2 Dsg Threshold(9)

• DF:2nd Level Safety:Temperature(18):SOT2 Dsg Time(11)

• DF:2nd Level Safety:Temperature(18):Open Thermistor(12)

• DF:2nd Level Safety:Temperature(18):Open Time(14)

• DF:2nd Level Safety:FET Verification(19):FET Fail Limit(0)

• DF:2nd Level Safety:FET Verification(19):FET Fail Time(2)

• DF:2nd Level Safety:Fuse Verification(21):Fuse Fail Limit(0)

• DF:2nd Level Safety:Fuse Verification(21):Fuse Fail Time(2)

• DF:Configuration:Registers(64):Permanent Fail Cfg 1(6), Permanent Fail Cfg 2(8)

• DF:PF Status:Device Status Data(96):Saved PF Flags 1(0), Saved PF Flags 2(2)

• SBS:TS1Temperature(0x5e)

• SBS:TS2Temperature(0x5f)

• SBS:Voltage(0x09)

• SBS:Current(0x0a)

• SBS:CellVoltage4..1(0x3c..0x3f)

• SBS:PFStatus(0x53)

2nd Level Protection Features

2.3.3 Limit-Based Protection

The bq20z60-R1/bq20z65-R1 reports a 2nd level permanent failure and sets the appropriate PFStatus flag if the internal error counter reaches the maximum error limit. The internal error counter is incremented by one if the error happens and reset to zero (0) for every good communication cycle.

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2nd Level Protection Features

AFE Communication Fault Protection— The gas gauge in the bq20z60-R1/bq20z65-R1 periodically

validates its read and write communications with the AFE. If either a read or write verify fails, an internal AFE_Fail_Counter is incremented. If the AFE_Fail_Counter reaches AFE Fail Limit, the bq20z60-R1/bq20z65-R1 reports an [AFE_C] permanent failure. The AFE_Fail_Counter is reset to zero (0) for every good communication cycle. If the AFE Fail Limit is set to 0, this feature is disabled. An [AFE_C] fault can also be declared if, after a full reset, the initial gain and offset values read from the AFE cannot be verified. These values are A/D readings of the AFE VCELL output. The AFE offset values are verified by reading the values twice and confirming that the readings are within acceptable limits. The maximum difference between two readings is set with AFE Init Limit. The maximum number of read retries, if offset and gain value verification fails and an [AFE_C] fault is declared, is set in AFE Fail Limit.

Periodic AFE Verification— The gas gauge in the bq20z60-R1/bq20z65-R1 periodically

(AFE Check Time) compares certain RAM content of the AFE with that of the data flash and the expected control-bit states. This function is disabled if AFE Check Time is set to 0. If an error is detected, the internal AFE_Fail_Counter is incremented. If the internal AFE_Fail_Counter reaches the AFE Fail Limit, the bq20z60-R1/bq20z65-R1 reports a permanent failure.

AFE Init Verification— After a full reset, the bq20z60-R1/bq20z65-R1 gas gauge and the AFE offset and

gain values are read twice and compared. The AFE Init Limit sets the maximum difference in A/D counts of two successful readings of offset and gain, which the bq20z60-R1/bq20z65-R1 still considers as the same value. If the gain and offset values are still not considered the same after AFE Init Retry Limit comparison retries, the bq20z60-R1/bq20z65-R1 reports a permanent failure error.

Data Flash Failure— The bq20z60-R1/bq20z65-R1 can detect if the data flash is not operating correctly.

A permanent failure is reported when either: (i) After a full reset the instruction flash checksum does not verify; (ii) if any data flash write does not verify; or (iii) if any data flash erase does not verify.

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Table 2-8. Error-Based 2nd Level Protection

Protection Monitored Value Fail Recovery

AFE Periodic communication AFE_Fail_Counter is reset to AFE Fail Limit [AFE_C] [XAFE_C] communication with the AFE zero (0) per each fault AFE Fail Recovery Time period

Periodic AFE Check RAM of the AFE with Decrement of internal AFE Fail Limit [AFE_P] [XAFE_P] verification AFE Check Time period AFE_Fail_Counter by one per

AFE Fail Recovery Time

period.

AFE initialization Initial gain and offset values – AFE Init Retry Limit [AFE_C] [XAFE_C]

from the AFE after full reset

Data flash failure Data flash – Falseflash checksum after [DFF] [XDFF]

Max Error Limit (Set to 0 PFAlert Flag, Permanent Fail to Disable Protection) PFStatus Flag Cfg Flag

reset, data flash write not verified, data flash erase not verified

Related Variables:

• DF:2nd Level Safety:FET Verification(19):FET Fail Limit(0)

• DF:2nd Level Safety:FET Verification(19):FET Fail Time(2)

• DF:2nd Level Safety:AFE Verification(20):AFE Check Time(0)

• DF:2nd Level Safety:AFE Verification(20):AFE Fail Limit(1)

• DF:2nd Level Safety:AFE Verification(20):AFE Fail Recovery Time(2)

• DF:2nd Level Safety:AFE Verification(20):AFE Init Retry Limit(3)

• DF:2nd Level Safety:AFE Verification(20):AFE Init Limit (4)

• DF:Configuration:Registers(64):Permanent Fail Cfg(6)

• DF:PF Status:Device Status Data(96):Saved PF Flags 1(0)

• SBS:PFStatus(0x53)

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2.3.4 Clearing Permanent Failure

A bq20z60-R1/bq20z65-R1 permanent failure can be cleared by sending two ManufacturerAccess commands in sequence: the first word of the PFKey followed by the second word of the PFKey. After sending these two commands in sequence, PFStatus flags are cleared. Refer to Permanent Fail Clear (PFKey) Manufacturer access for further details.

Related Variables:

• SBS:ManufacturerAccess(0x00)

• SBS:PFStatus(0x53)

2.4 Gas Gauging

The bq20z60-R1/bq20z65-R1 features Impedance Track™ (IT) gauging algorithm and is capable of supporting a maximum battery pack capacity of 32Ah. The gas gauge measures individual cell voltages, pack voltage, temperature, and current using features of the AFE. The bq20z60-R1/bq20z65-R1 determines battery state of charge by analyzing individual cell voltages when a time exceeding 35 minutes has passed since the last charge or discharge activity of the battery. The bq20z60-R1/bq20z65-R1 measures charge and discharge activity by monitoring the voltage across a small-value series sense resistor (10 mΩ typ.) between the cell stack negative terminal and the negative terminal of the battery pack. The battery state of charge is subsequently adjusted during load or charger application using the integrated charge passed through the battery.

2.4.1 Impedance Track Configuration

Load Mode— During normal operation, the battery-impedance profile compensation of the Impedance

Track algorithm can provide more-accurate full-charge and remaining state-of-charge information if the typical load type is known. The two selectable options are constant current (Load Mode = 0) and constant power (Load Mode = 1).

Gas Gauging

Load Select— In order to compensate for the I × R drop near the end of discharge, the

bq20z60-R1/bq20z65-R1 must be configured for whatever current (or power) will flow in the future. While it cannot be exactly known, the bq20z60-R1/bq20z65-R1 can use load history such as the average current of the present discharge to make a sufficiently accurate prediction. The bq20z60-R1/bq20z65-R1 can be configured to use several methods of this prediction by setting the Load Select value. Because this estimate has only a second-order effect on remaining capacity accuracy, different measurement-based methods (0 to 3, and method 7) result in only minor differences in accuracy. However, methods 4 to 6, where an estimate is arbitrarily assigned by the user, can result in significant error if a fixed estimate is far from the actual load. For highly variable loads, selection 7 will give the most conservative estimate and is preferable.

Constant Current (Load Mode = 0) Constant Power (Load Mode = 1) 0 = Avg I Last Run Avg P Last Run 1 = Present average discharge current Present average discharge power 2 = Current Current × Voltage 3 = AverageCurrent (default) AverageCurrent × average Voltage 4 = Design Capacity / 5 Design Energy / 5 5 = AtRate (mA) AtRate (10 mW) 6 = User Rate-mA User Rate-mW

7= Max Avg I Last Run Max Avg P Last Run

Pulsed Load Compensation and Termination Voltage— In order to take into account pulsed loads

while calculating remaining capacity until Term Voltage threshold is reached, the bq20z60-R1/bq20z65-R1 monitors not only average load but also short load spikes. The maximum voltage deviation during a load spike is continuously updated during discharge and stored in Delta Voltage.

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Gas Gauging

Reserve Battery Capacity— The bq20z60-R1/bq20z65-R1 allows an amount of capacity to be reserved

Related Variables:

• DF:SBS Configuration:Data(48):Design Capacity(22)

• DF:SBS Configuration:Data(48):Design Energy(24)

• DF:Configuration:Operation Cfg B(2)[RESCAP]

• DF:Gas Gauging:IT Cfg(80):Load Select(0)

• DF:Gas Gauging:IT Cfg(80):Load Mode(1)

• DF:Gas Gauging:IT Cfg(80):Term Voltage(59)

• DF:Gas Gauging:IT Cfg(80):User Rate-mA(76)

• DF:Gas Gauging:IT Cfg(80):User Rate-mW(78)

• DF:Gas Gauging:IT Cfg(80):Reserve Cap-mAh(80)

• DF:Gas Gauging:IT Cfg(80):Reserve Cap-mWh(82)

• DF:Gas Gauging:State(82):Avg I Last Run(21)

• DF:Gas Gauging:State(82):Avg P Last Run(23)

• DF:Gas Gauging:State(82):Delta Voltage(25)

• DF:Gas Gauging:State(82):Max I Last Run(31)

• DF:Gas Gauging:State(82):Max P Last Run(33)

• SBS:BatteryMode(0x03)[CapM]

• SBS:Voltage(0x09)

• SBS:Current(0x0a)

• SBS:AverageCurrent(0x0b)

• SBS:OperationStatus(0x54)[LDMD]

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in either mAh (Reserve Cap-mAh, Load Mode = 0) or 10 mWh (Reserve Cap-mWh, Load Mode = 1) units between the point where the RemainingCapacity function reports zero capacity, and the absolute minimum pack voltage, Term Voltage. This enables a system to report zero energy, but still have enough reserve energy to perform a controlled shutdown, or to provide an extended sleep period for the host system.

Also, if the [RESCAP] bit is set to 0, the reserve capacity is compensated at a no-load condition. However, if [RESCAP] bit is set to 1, then the reserve capacity is compensated at the present discharge rate as selected by Load Select.

2.4.2 Gas Gauge Modes

Resistance updates take place only in discharge mode, while OCV and Qmax updates only take place in relaxation mode. Entry and exit of each mode is controlled by data flash parameters in the subclass Gas

Gauging: Current Thresholds section. In relaxation mode or discharge mode, the DSG flag in BatteryStatus is set.

In order to prevent abnormally fast resistance change, resistance change is limited to old value +- Ra Max Delta (mOhm). Recommended setting is 15% of 4 Ra grid point value, after optimized values of Ra are obtained from optimization cycle.

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DischargeMode

RelaxationMode

Current < (–) DsgCurrentThreshold

Current >(–) forQuitCurrent

DsgRelaxTime

period

ChargeMode

Current

> ChgCurrentThreshold

Current

< QuitCurrent

for ChgRelaxTime

period

OCVupdate

Qmax update

[DSG]

CellImpedance update

[DSG]

Current

> ChgCurrentThreshold

Current <(–) DsgCurrentThreshold

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Gas Gauging

Figure 2-6. Gas Gauge Operating Modes

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QuitCurrent

(–)QuitCurrent

Current

Time

RelaxationMode ChargeMode DischargeModeRelaxationMode ChargeMode DischargeMode RelaxationMode

ChgRelaxTime

DsgRelaxTime

1 10 1 1 10[DSG]

Gas Gauging

Charge mode is exited and relaxation mode is entered when Current goes below Quit Current for a period of Chg Relax Time. Discharge mode is entered when Current goes below (–)Dsg Current Threshold. Discharge mode is exited and relaxation mode is entered when Current goes above (–)Quit Current threshold for a period of Dsg Relax Time. Charge mode is entered when Current goes above Chg Current Threshold.

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Figure 2-7. Gas Gauge Operating Mode Example

Related Variables:

• DF:Gas Gauging:Current Thresholds(81):Dsg Current Threshold(0)

• DF:Gas Gauging:Current Thresholds(81):Chg Current Threshold(2)

• DF:Gas Gauging:Current Thresholds(81):Quit Current(4)

• DF:Gas Gauging:Current Thresholds(81):Dsg Relax Time(6)

• DF:Gas Gauging:Current Thresholds(81):Chg Relax Time(7)

• SBS:Current(0x0a)

• SBS:BatteryStatus(0x16)[DSG]

• SBS:OperationStatus(0x54)[VOK],[R_DIS],[QEN]

2.4.3 Qmax

The total battery capacity is found by comparing states of charge before and after applying the load with the amount of charge passed. When an applications load is applied, the impedance of each cell is measured by comparing the open circuit voltage (OCV) obtained from a predefined function for present state of charge with the measured voltage under load.

Measurements of OCV and charge integration determine chemical state of charge and Chemical Capacity (Qmax).

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The bq20z60-R1/bq20z65-R1 acquires and updates the battery-impedance profile during normal battery usage. It uses this profile, along with state-of-charge and the Qmax values, to determine

FullChargeCapacity and RelativeStateOfCharge specifically for the present load and temperature. FullChargeCapacity reports a capacity or energy available from a fully charged battery reduced by

Reserve Cap-mAh or Reserve Cap-mWh under the present load and present temperature until Voltage reaches the Term Voltage.

Related Variables:

• DF:Gas Gauging:IT Config(80):Term Voltage(59)

• SBS:Voltage(0x09)

• SBS:RelativeStateOfCharge(0x0d)

• SBS:FullChargeCapacity(0x10)

2.4.3.1 Qmax Initial Values

The initial Qmax Pack, Qmax Cell 0, Qmax Cell 1, Qmax Cell 2, and Qmax Cell 3 values should be taken from the cell manufacturers' data sheet multiplied by the number of parallel cells, and are also used for the DesignCapacity function value in the Design Capacity data flash value.

See the Theory and Implementation of Impedance Track Battery Fuel-Gauging Algorithm in bq20zxx Product Family application report (SLUA364B) for further details.

Related Variables:

• DF:SBS Configuration:Data(48):Design Capacity(22)

• DF:Gas Gauging:State(82):Qmax Cell 0(0)

• DF:Gas Gauging:State(82):Qmax Cell 1(2)

• DF:Gas Gauging:State(82):Qmax Cell 2(4)

• DF:Gas Gauging:State(82):Qmax Cell 3(6)

• DF:Gas Gauging:State(82):Qmax Pack(8)

• SBS:DesignCapacity(0x18)

Gas Gauging

2.4.3.2 Qmax Update Conditions

The bq20z60-R1/bq20z65-R1 updates the no-load full capacity (QMAX) when two open circuit voltage (OCV) readings are taken. These OCV readings are affected by the setting of [CHGOCV_DIS] and taken when the battery is in a relaxed state before and after charge or discharge activity. A relaxed state is achieved if the battery voltage has a dV/dt of < 4 μV/s. Typically it takes 2 hours in a charged state and 5 hours in a discharged state to ensure that the dV/dt condition is satisfied. If 5 hours. is exceeded, a reading is taken even if the dV/dt condition was not satisfied. A QMAX update is disqualified under the following conditions:

Temperature— If Temperature is outside of the range 10°C to 40°C. Delta Capacity— If the capacity change between suitable battery rest periods is less than 37%. Voltage— If CellVoltage4..1 is in the range of 3737 mV to 3800 mV for the default LION chemistry. (See

the Support of Multiple Li-Ion Chemistries With Impedance Track Gas Gauges application note (SLUA372) for the voltage ranges of other chemistries.)

Offset Error— If offset error accumulated during time passed from previous OCV reading exceeds 1% of

Design Capacity, update is disqualified. Offset error current is calculated as CC Deadband / sense resistor value.

Related Variables:

• DF:Calibration:Current(107):CC Deadband(2)

• SBS:Temperature(0x08)

• SBS:RelativeStateOfCharge(0x0d)

• SBS:AbsoluteStateOfCharge(0x0e)

• SBS:DesignCapacity(0x18)

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Charge Control

• SBS:CellVoltage4(0x3c)

• SBS:CellVoltage3(0x3d)

• SBS:CellVoltage2(0x3e)

• SBS:CellVoltage1(0x3f)

• SBS:OperationStatus(0x54)[VOK],[QEN] Due to variations in charging voltages and taper current, chemical state of charge at the end of charge is

not always 100%. To account for the difference in state of charge achieved by different charges, the gas-gauge learns actual depth of discharge after charge termination and relaxation for more than 30 minutes. These values are store in dataflash individually for each cell as follows:

• Cell 0 Chg DOD at EOC = 0

• Cell 1 Chg DOD at EOC = 0

• Cell 2 Chg DOD at EOC = 0

• Cell 3 Chg DOD at EOC = 0 Units of DOD are in an internal format. To convert it to %, the internal units should be divided by 163.84.

2.5 Charge Control

The bq20z60-R1/bq20z65-R1 can report to a smart charger the appropriate charging current needed for constant-current charging and the charging voltage needed for constant-voltage charging per the charging algorithm by using the ChargingCurrent and ChargingVoltage functions. The actual charging status of the bq20z60-R1/bq20z65-R1 is indicated with flags and can be read out with the ChargingStatus function.

Related Variables:

• SBS:ChargingCurrent(0x14)

• SBS:ChargingVoltage(0x15)

• SBS:ChargingStatus(0x55)

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2.5.1 Charge Control SMBus Broadcasts

All broadcasts to a host or a smart charger are enabled by the [BCAST] bit. If the [HPE] bit is enabled, master-mode broadcasts to the host address are PEC enabled. If the [CPE] bit is enabled, master-mode broadcasts to the Smart-Charger address are PEC enabled. When broadcast is enabled, the following broadcasts are sent:

• ChargingVoltage and ChargingCurrent broadcasts are sent to the Smart-Charger device address (0x12) every 10 to 60 seconds.

• If any of the [OCA], [TCA], [OTA], [TDA], [RCA], [RTA] flags are set, the AlarmWarning broadcast is sent to the host device address (0x14) every 10 seconds. Broadcasts stop when all flags above have been cleared.

• If any of the [OCA], [TCA], [OTA] or [TDA] flags are set, the AlarmWarning broadcast is sent to Smart-Charger device address every 10 seconds. Broadcasts stop when all flags above have been cleared.

Related Variables:

• DF:Configuration:Registers(64):Operation Cfg B(2)[CPE],[HPE],[BCAST]

• SBS:ChargingCurrent(0x14)

• SBS:ChargingVoltage(0x15)

• SBS:BatteryStatus(0x16)[OCA],[TCA],[OTA],[TDA],[RCA],[RTA]

2.5.2 Cell Balancing

The bq20z60-R1/bq20z65-R1 can determine the chemical state of charge of each cell using the Impedance Track algorithm. The cell balancing algorithm used in the bq20z60-R1/bq20z65-R1 decreases the differences in imbalanced cells in a fully charged state gradually, which prevents fully charged cells from becoming overcharged causing excessive degradation. This increases overall pack energy by preventing premature charge termination. More information can be found in the Cell Balancing Using the bq20zxx application report (SLUA340B).

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The algorithm determines the amount of charge needed to fully charge each cell. There is a bypass FET in parallel with each cell connected to the AFE. The FET is enabled for each cell with charge greater than the lowest charged cell to reduce charge current through those cells. Each FET is enabled for a precalculated time as calculated by the cell balancing algorithm. When any bypass FET is turned on, then the [CB] charging status flag is set, otherwise the [CB] flag is cleared.

Cell balancing is active after a Qmax update has occurred with the FC bit set and OCV taken. This state can be determined by the Update Status being set to 0x0E.

If Min Cell Deviation is set to 0, cell balancing is disabled and all bypass FETs stay OFF. The bypass time needed for each cell is calculated as: Min Cell Deviation = R / (duty_cycle × V_avg) × 3.6 s/mAh Where:

R = internal bypass FET resistance of 500 Ω (typ.) + 2 series input filter resistors, Rχ. For example: if input filter Rχ value is 100 Ω, R = 500 + 2 × Rχ = 700 Ω.

V_avg = 3.6 V duty_cycle = 0.4 typ.

Related Variables:

• DF:Charge Control:Cell Balancing Cfg(37):Min Cell Deviation(0)

• SBS:ChargingStatus(0x55)[CB]

2.5.3 Charge-Inhibit Mode

Charge Control

If the bq20z60-R1/bq20z65-R1 is in discharge mode or relaxation mode ([DSG] = 1), the bq20z60-R1/bq20z65-R1 goes into charge-inhibit mode and sets the ChargingCurrent and ChargingVoltage values to 0 to inhibit charging if:

• Temperature < JT1 limit OR

• Temperature > JT3 limit

In charge-inhibit mode, the [XCHG] flag in ChargingStatus is set. If the [CHGIN] bit in Operation Cfg B is set, the CHG FET and ZVCHG FET (if used) are also turned off when the bq20z60-R1/bq20z65-R1 is in charge-inhibit mode.

The bq20z60-R1/bq20z65-R1 allows charging to resume when:

• Temperature ≥ JT1 + Temp Hys AND

• Temperature ≤ JT3 – Temp Hys

The FETs also return to their previous states at that time. The [XCHG] flag is cleared when the foregoing conditions are met, when a charge fault condition is detected, or when the battery is removed if in removable mode ([NR] = 0).

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ChargeInhibitHigh

Charging Allowed

ChargeInhibitLow

ChargingCurrent

= 0

ChargingVoltage =0

[XCHG

]

If [CHGIN

] bit set

, CHGFET and

ZVCHGFETareturnedoff.

Temperature

≥

JEITA T1

+ TempHys

Temperature

< JEITA T1

ChargingCurrent =0

ChargingVoltage =0

[XCHG

]

If [CHGIN

] bit set

, CHGFET and

ZVCHGFETareturnedoff.

Temperature

≤

JT3 – TempHys

Temperature

> JT3

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Detailed Description SLUU386–January 2010

Figure 2-8. Charge Inhibit

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Related Variables:

• DF:Charge Control:Charge Temp Cfg(32):JT1(0)

• DF:Charge Control:Charge Temp Cfg(32):JT3(6)

• DF:Charge Control:Charge Temp Cfg(32):Temp Hys(10)

• DF:Configuration:Registers(64):Operation Cfg B(2)[CHGIN],[NR]

• SBS:Temperature(0x08)

• SBS:ChargingCurrent(0x14)

• SBS:ChargingVoltage(0x15)

• SBS:BatteryStatus(0x16)[DSG]

• SBS:ChargingStatus(0x55)[XCHG]

2.5.4 Charge-Suspend Mode

The bq20z60-R1/bq20z65-R1 suspends charging when:

• Temperature < JT1, OR

• Temperature > JT4

In charge-suspend mode, the [CHGSUSP] flag in ChargingStatus is set and ChargingCurrent is set to 0. The CHG FET and ZVCHG FET (if used) are also turned off if the [CHGSUSP] bit in the Operation Cfg B register is set.

The bq20z60-R1/bq20z65-R1 resumes charging if:

• Temperature ≥ JT1 + Temp Hys, AND

• Temperature ≤ JT3 – Temp Hys.

On resuming, the bq20z60-R1/bq20z65-R1 clears the [CHGSUSP] status flag and sets ChargingCurrent according to the appropriate charging mode entered, and the CHG and ZVCHG FETs (if used) return to their previous state.

The bq20z60-R1/bq20z65-R1 also leaves the charge-suspend mode and clears the [CHGSUSP] flag when a protection condition is detected or when the battery is removed in removable battery mode ([NR] =

0).

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ChargeSuspendHigh

Charging

ChargeSuspendLow

ChargingCurrent

= 0

[CHGSUSP

]

If [CHGSUSP

] bitin

OperationCfgB

isset

, CHGFET

+ ZVCHGFETare

turnedoff

Temperature

≥

JT1 + TempHys

Temperature

< JT1

ChargingCurrent

= 0

[CHGSUSP

]

If [CHGSUSP

] bitin

OperationCfgB

isset

, CHGFET

+ ZVCHGFETare

turnedoff

Temperature

≤

JT3 - TempHys

AverageCurrent

> ChgCurrentThreshold

Temperature

> JT4

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Detailed Description SLUU386–January 2010

Figure 2-9. Charge Suspend

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Related Variables:

• DF:Charge Control:Charge Temp Cfg(32):JT1(0)

• DF:Charge Control:Charge Temp Cfg(32):JT3(6)

• DF:Charge Control:Charge Temp Cfg(32):JT4(8)

• DF:Charge Control:Charge Temp Cfg(32):Temp Hys(10)

• DF:Configuration:Registers(64):Operation Cfg B(2)[CHGSUSP],[NR]

• DF:Gas Gauging:Current Thresholds(81):Chg Current Threshold(2)

• SBS:Temperature(0x08)

• SBS:AverageCurrent(0x0b)

• SBS:ChargingCurrent(0x14)

• SBS:BatteryStatus(0x16)[DSG]

• SBS:ChargingStatus(0x55)[CHGSUSP]

2.5.5 Charging and Temperature Ranges

The bq20z60-R1/bq20z65-R1 requests different charging current and charging voltage for each of the temperature ranges defined in Section 2.1, through the ChargingVoltage and ChargingCurrent commands.

Additionally, the charging current can be set differently depending on the cell voltage. Three ranges of cell voltage are defined using two cell voltage thresholds: Cell Voltage Threshold 1 and Cell Voltage Threshold 2 (see Table 2-9). During charging, as cell voltage increases, ChargingCurrent is set to the appropriate value when cell voltage crosses one of the cell voltage thresholds. However, if cell voltage decreases below the threshold, ChargingCurrent is not set back to the previous value unless a discharge or relax state is detected. This is done to avoid the situation where the charging current is being changed back and forth due to the voltage drop that results from changing the charging current value.

Charge Control

Table 2-9. Cell Voltage Ranges

Condition Cell Voltage Range

max(CellVoltage4..1) < Cell Voltage Threshold 1 CVR1 Cell Voltage Threshold 1 < max(CellVoltage4..1) < Cell Voltage Threshold 2 CVR2 Cell Voltage Threshold 2 < max(CellVoltage4..1) CVR3

The dependency of the Charging Voltage and Charging Current on temperature range and cell voltage range is summarized in Table 2-10 and illustrated in Figure 2-10 and Figure 2-11.

Table 2-10. Charging Voltage and Charging Current Dependency on Temperature Range and Cell

Voltage Range

Temp Range Cell Voltage Charging Voltage Charging Current

TR1 – 0 0

CVR1 LT Chg Current1

TR2 CVR2 LT Chg Voltage LT Chg Current2

CVR3 LT Chg Current3 CVR1 ST1 Chg Current1

TR2A CVR2 ST1 Chg Voltage ST1 Chg Current2

CVR3 ST1 Chg Current3 CVR1 ST2 Chg Current1

TR3 CVR2 ST2 Chg Voltage ST2 Chg Current2

CVR3 ST2 Chg Current3 CVR1 HT Chg Current1

TR4 CVR2 HT Chg Voltage HT Chg Current2

CVR3 HT Chg Current3

TR5 – 0 0

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T2 T2a T3 T4

ChgInhibit ChgInhibit

ChgSuspend

TR5

LoTempChg

TR 2

StdTempChg 1

TR2A

StdTempChg2

TR 3

HiTempChg

TR 4

ChgSuspend

TR 1

LTChgVoltage

HTChgVoltage

ST 1 ChgVoltage

ST 2 ChgVoltage

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Figure 2-10. Temp Ranges and Charge Voltage for JEITA With Enhancements for More Complex

Charging Profiles

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T2 T2a T3 T4

ChgInhibit ChgInhibit

ChgSuspend

TR 5

LoTempChg

TR 2

StdTempChg1

TR 2A

StdTempChg2

TR 3

HiTempChg

TR 4

ChgSuspend

TR 1

CellVoltage

Threshold 2

CellVoltage

Threshold 1

CVR1

CVR2

CVR3

LTChgCurrent 1

LTChgCurrent 2

LTChgCurrent 3

ST1 ChgCurrent 1

ST1 ChgCurrent 2

ST1 ChgCurrent 3

ST2 ChgCurrent 1

ST2 ChgCurrent 2

ST2 ChgCurrent 3

HTChgCurrent 1

HTChgCurrent 2

HTChgCurrent 3

COVThreshold

Pre-chgVoltage

Threshold

CellVoltage

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Figure 2-11. Temp Ranges and Charge Current for JEITA With Enhancements for More Complex

2.5.5.1 Low Temperature Charging

The bq20z60-R1/bq20z65-R1 enters this mode when the Temperature function reports a temperature in the TR2 range (JT1 < Temperature < JT2). In this mode [LTCHG] flag in ChargingStatus is set, the

ChargingVoltage is set to LT Chg Voltage, and the ChargingCurrent is set to LT Chg Current1, LT Chg Current2, or LT Chg Current3 depending on the active cell voltage range. The charging current dataflash

values for low temp charging should be set to low current values similar to precharge mode. The bq20z60-R1/bq20z65-R1 leaves this mode and clears the [LTCHG] flag if the Temperature goes below JT1 or above JT2 + Temp Hys.

Charging Profiles

2.5.5.2 Standard Temperature Charging 1

The bq20z60-R1/bq20z65-R1 enters this mode when the Temperature function reports a temperature in the TR2A range (JT2 < Temperature < JT2a). In this mode the [ST1CHG] flag in ChargingStatus is set,

ChargingVoltage is set to ST1 Chg Voltage, and the ChargingCurrent is set to ST1 Chg Current, ST1 Chg Current 2, or ST1 Chg Current 3 depending on the active cell voltage range. The

bq20z60-R1/bq20z65-R1 leaves this mode and clears the [ST1CHG] flag if the Temperature goes below JT2 or above JT2a.

2.5.5.3 Standard Temperature Charging 2

The bq20z60-R1/bq20z65-R1 enters this mode when the Temperature function reports a temperature in

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the TR3 range (JT2a < Temperature < JT3). In this mode the [ST2CHG] flag in ChargingStatus is set, ChargingVoltage is set to ST2 Chg Voltage, and the ChargingCurrent is set to ST2 Chg Current 1 or

ST2 Chg Current 2 or ST2 Chg Current 3 depending on the active cell voltage. The bq20z60-R1/bq20z65-R1 leaves this mode and clears the [ST2CHG] flag if the Temperature goes below JT2a – Temp Hys or above JT3 .

2.5.5.4 High Temperature Charging

The bq20z60-R1/bq20z65-R1 enters this mode when the Temperature function reports a temperature in the TR4 range (JT3 < Temperature < JT4). In this mode the [HTCHG] flag in ChargingStatus is set, ChargingVoltage is set to HT Chg Voltage, and the ChargingCurrent is set to HT Chg Current1, HT Chg Current2, or HT Chg Current3 depending on the active cell voltage. The bq20z60-R1/bq20z65-R1 leaves this mode and clears the [HTCHG] flag if the Temperature goes below JT3 – Temp Hys or above JT4.

Related Variables:

• DF:Charge Control:Charge Temp Cfg(32):JT1(0)

• DF:Charge Control:Charge Temp Cfg(32):JT2(2)

• DF:Charge Control:Charge Temp Cfg(32):JT2a(4)

• DF:Charge Control:Charge Temp Cfg(32):JT3(6)

• DF:Charge Control:Charge Temp Cfg(32):JT4(8)

• DF:Charge Control:Charge Temp Cfg(32):Temp Hys(10)

• DF:Charge Control:Charge Cfg(34):LT Charge Voltage(0)

• DF:Charge Control:Charge Cfg(34):LT Charge Current 1(2)

• DF:Charge Control:Charge Cfg(34):LT Charge Current 2(4)

• DF:Charge Control:Charge Cfg(34):LT Charge Current 3(6)

• DF:Charge Control:Charge Cfg(34):ST1 Charge Voltage(8)

• DF:Charge Control:Charge Cfg(34):ST1 Charge Current 1(10)

• DF:Charge Control:Charge Cfg(34):ST1 Charge Current 2(12)

• DF:Charge Control:Charge Cfg(34):ST1 Charge Current 3(14)

• DF:Charge Control:Charge Cfg(34):ST2 Charge Voltage(16)

• DF:Charge Control:Charge Cfg(34):ST2 Charge Current 1(18)

• DF:Charge Control:Charge Cfg(34):ST2 Charge Current 2(20)

• DF:Charge Control:Charge Cfg(34):ST2 Charge Current 3(22)

• DF:Charge Control:Charge Cfg(34):HT Charge Voltage(24)

• DF:Charge Control:Charge Cfg(34):HT Charge Current 1(26)

• DF:Charge Control:Charge Cfg(34):HT Charge Current 2(28)

• DF:Charge Control:Charge Cfg(34):HT Charge Current 3(30)

• DF:Charge Control:Charge Cfg(34):Cell Voltage Threshold 1(32)

• DF:Charge Control:Charge Cfg(34):Cell Voltage Threshold 2(34)

• SBS:Temperature(0x08)

• SBS:ChargingCurrent(0x14)

• SBS:ChargingVoltage(0x15)

• SBS:ChargingStatus(0x55)[LTCHG] , [ST1CHG] , [ST2CHG], [HTCHG]

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2.5.6 Precharge

The bq20z60-R1/bq20z65-R1 enters precharge mode during charging if any cell voltage goes below Pre-chg Voltage Threshold limit or if any of the SafetyStatus flags, [CUV], [OCD], or [OCD2] is set.

Depending on the setting of the [ZVCHG1] and [ZVCHG0] bits in Operation Cfg A, different FETs can be used in pre-charge mode.

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In precharge mode, the [PCHG] flag is set, the ChargingVoltage is set to Pre-chg Current, and ChargingVoltage is set per the charging algorithm.

The bq20z60-R1/bq20z65-R1 leaves precharge mode and clears the [PCHG] flag if all cell voltages reach or rise above Pre-chg Recovery Voltage. Precharge mode is also exited if charge suspend mode is entered, any fault condition is detected, or the pack is removed in removable mode.

Related Variables:

• DF:Charge Control:Pre-Charge Cfg(33):Pre-chg Voltage Threshold(0)

• DF:Charge Control:Pre-Charge Cfg(33):Pre-chg Recovery Voltage(0)

• DF:Charge Control:Pre-Charge Cfg(33):Pre-chg Current(4)

• DF:Configuration:Registers(64):Operation Cfg A(0)[ZVCHG1],[ZVCHG0]

• SBS:ChargingCurrent(0x14)

• SBS:ChargingVoltage(0x15)

• SBS:CellVoltage4..1(0x3c..0x3f)

• SBS:SafetyStatus(0x51)[CUV],[OCD],[OCD2]

• SBS:ChargingStatus(0x55)[PCHG]

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Table 2-11. Precharge FET

ZVCHG1 ZVCHG0 FET USED

0 0 ZVCHG FET 0 1 CHG FET 1 0 GPOD Pin (on the

AFE when used with

bq20z60)

1 1 No Action

2.5.7 Primary Charge Termination

The bq20z60-R1/bq20z65-R1 determines charge termination if:

• Average Charge Current < Taper Current during two consecutive Current Taper Window time periods, AND

• The accumulated change in capacity must be > 0.25 mAh per period during two consecutive Current Taper Window time periods, AND

• Taper voltage condition is met. Taper voltage condition is either cell voltage-based or pack voltage-based depending on the bit [CELL_TAPER] in Operation Cfg C.

– [CELL_TAPER] =1: Max (CellVoltage4..1) + Taper Voltage ≥ ChargingVoltage / number of cells – [CELL_TAPER] =0: Voltage + Taper Voltage ≥ ChargingVoltage

NOTE: To ensure proper charge termination, it is recommend that Taper Current be set to a value

greater than Quit Current.

The following parameters change the behavior of bq20z60-R1/bq20z65-R1 on charge termination:

Table 2-12. Primary Charge Termination

Parameter Behavior on Primary Charge Termination

[TCA Set %] = –1 [TCA] flag set, [MCHG] flag set, ChargingCurrent = Maintenance Current [FC Set %] = –1 [FC] flag set [CHGFET] set CHG FET turned off [CSYNC] set RemainingCapacity = FullChargeCapacity regardless of TCA Set % value [RSOCL] set If the [RSOCL] bit in Operation Cfg C is set then RelativeStateofCharge and RemainingCapacity are held at 99% until primary

[RSOCL] clear If the [RSOCL] bit in Operation Cfg C is cleared then RelativeStateofCharge and RemainingCapacity are not held at 99% until

charge termination occurs. Only on entering primary charge termination is 100% displayed.

primary charge termination occurs. Fractions of % greater than 99% are rounded up to display 100%.

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Related Variables:

• DF:Charge Control:Termination Cfg.(36):Maintenance Current(0)

• DF:Charge Control:Termination Cfg.(36):Taper Current(2)

• DF:Charge Control:Termination Cfg.(36):Taper Voltage(6)

• DF:Charge Control:Termination Cfg.(36):Current Taper Window(8)

• DF:Charge Control:Termination Cfg.(36):TCA Set %(9)

• DF:Charge Control:Termination Cfg.(36):FC Set %(11)

• DF:Configuration:Registers(64):Operation Cfg B(2)[CHGFET],[CSYNC]

• DF:Configuration:Registers(64):Operation Cfg C(4)[RSOCL]

• DF:Gas Gauging:Current Thresholds(81):Quit Current(4)

• SBS:Voltage(0x09)

• SBS:Current(0x0a)

• SBS:RemainingCapacity(0x0f)

• SBS:FullChargeCapacity(0x10)

• SBS:ChargingCurrent(0x14)

• SBS:BatteryStatus(0x16)[TCA],[FC]

• SBS:CellVoltage4..1(0x3c..0x3f)

• SBS:ChargingStatus(0x55)[MCHG]

2.5.8 Charging Faults

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The bq20z60-R1/bq20z65-R1 can report charging faults in the ChargingStatus register. When the [OCHGI] bit in Charge Fault Cfg is set, the CHG FET is turned OFF and the ZVCHG FET is turned ON if the [ZVCHG1], [ZVCHG0] bits in Operation Cfg A are set appropriately. If the ZVCHG FET is not used the CHG FET remains ON, regardless of the bits set in Charge Fault Cfg, because it acts as the ZVCHG FET.

On occurrence of a charging fault, the bq20z60-R1/bq20z65-R1:

• Sets the appropriate ChargingStatus flag

• Turns off the CHG FET, and turns on the ZVCHG FET (if used) if the flag in Charge Fault Cfg and ChargingStatus matches. The DSG FET is also turned off if charging fault is a Battery Depleted fault.

• Sets the ChargingCurrent = 0, ChargingVoltage = 0; (ChargingVoltage is not set to zero if it is a Battery Depleted fault).

• Sets the [TCA] flag in BatteryStatus

• Sets the [OCA] flag in BatteryStatus if it is an Overcharge fault

On recovery, the bq20z60-R1/bq20z65-R1:

• Resets the appropriate ChargingStatus flags

• Sets the CHG FET and ZVCHG FET (if used) to previous states. (DSG FET is also allowed to turn on again on recovery from Battery Depleted fault).

• Sets ChargingCurrent and ChargingVoltage back to previous state according to charging algorithm.

• Resets [TCA] (and [OCA] if it was set) flag in BatteryStatus

Precharge Mode Timeout

When Current ≥ Chg Current Threshold, the bq20z60-R1/bq20z65-R1 starts the Precharge Timer. The Precharge Timer is suspended when precharge mode is not active ([PCHG] = 0). Set Precharge Timeout [PCMTO] to zero to disable this feature.

The bq20z60-R1/bq20z65-R1 goes into precharge mode charging timeout [PCMTO] if:

• Precharge timer ≥ Precharge Timeout

The bq20z60-R1/bq20z65-R1 recovers if:

• Current ≤ (–)Dsg Current Threshold, OR

• Pack is removed and reinserted, if [NR] = 0

Charge Mode Timeout

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When Current is ≥ Chg Current Threshold, the bq20z60-R1/bq20z65-R1 starts the Charge Timer. The Charge Timer is suspended when charge is not active ([LTCHG] = 0, [ST1CHG] = 0, [ST2CHG] = 0, and [HTCHG] = 0 , or when [DSG] = 1. The Charge Timer is reset when an amount of discharge greater than

Over Charge Recovery is detected or if the pack is removed and reinserted when [NR] = 0. Set Charge Timeout to 0 to disable this feature.

The bq20z60-R1/bq20z65-R1 goes into charge mode charging timeout if:

• Charge timer ≥ Charge Timeout

The bq20z60-R1/bq20z65-R1 recovers if:

• Current ≤ (–)Dsg Current Threshold OR

• Pack is removed and reinserted if [NR] = 0

Overcharging Voltage

The bq20z60-R1/bq20z65-R1 goes into overcharging voltage mode if:

• Voltage ≥ ST2 Chg Voltage + Over Charging Voltage for minimum Over Charging Volt Time period.

The bq20z60-R1/bq20z65-R1 recovers, if:

• Voltage ≤ ST2 Chg Voltage

Overcharging Current

The bq20z60-R1/bq20z65-R1 goes into overcharging current mode if:

• Current ≥ ChargingCurrent + Over Charging Current for minimum Over Charging Curr Time period.

The bq20z60-R1/bq20z65-R1 recovers, if:

• AverageCurrent ≤ Over Charging Curr Recov

Overcharge

The bq20z60-R1/bq20z65-R1 goes into overcharge mode if the battery pack is charged in excess of FullChargeCapacity by Over Charge Capacity:

The bq20z60-R1/bq20z65-R1 recovers if any of the following conditions are met:

• Pack removed and reinserted ([NR] = 0)

• Continuous amount of discharge over Over Charge Recovery and AverageCurrent < 0,

• RemainingCapacity ≤ FC Clear %

Battery Depleted

The bq20z60-R1/bq20z65-R1 goes into battery depleted mode if:

• Voltage ≤ Depleted Voltage for Depleted Voltage Time and charger is present

The bq20z60-R1/bq20z65-R1 recovers, if:

• Voltage > Depleted Voltage Recovery

Charge Control

when [NR] = 1

Table 2-13. Charging Faults

ChargingStatus Flag,

Charge Fault Fault Condition Recovery Condition Charge Fault

Configuration Flag

Precharge Precharge Timer ≥ Precharge Timeout Current ≤ (–)Dsg Current Threshold, OR [PCMTO] Timeout pack removed and reinserted if [NR] = 0

Charge Timeout Charge Timer ≥ Charge Timeout [CMTO] Overcharging Voltage ≥ ST2 Chg Voltage + Voltage ≤ ST2 Chg Voltage [OCHGV]

Voltage Over Charging Voltage for minimum

Over Charging Volt Time

Overcharging Current ≥ ChargingCurrent + AverageCurrent ≤ Over Charging Curr [OCHGI] Current Over Charging Current for minimum Over Recov

Charging Curr Time

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Charge Fault Fault Condition Recovery Condition Charge Fault

Overcharge RemainingCapacity – FullChargeCapacity ≥ Pack removed and reinserted if [NR] = 0, [OC]

Battery Depleted Voltage ≤ Depleted Voltage for minimum Voltage > Depleted Voltage Recovery [XCHGLV]

Related Variables:

• DF:Charge Control:Charge Cfg(34):ST2 Chg Voltage(16)

• DF:Charge Control:Termination Cfg.(36):FC Clear %(12)

• DF:Charge Control:Charging Faults(38):Over Charging Voltage(0)

• DF:Charge Control:Charging Faults(38):Over Charging Volt Time(2)

• DF:Charge Control:Charging Faults(38):Over Charging Current(3)

• DF:Charge Control:Charging Faults(38):Over Charging Curr Time(5)

• DF:Charge Control:Charging Faults(38):Over Charging Curr Recov(6)

• DF:Charge Control:Charging Faults(38):Depleted Voltage(8)

• DF:Charge Control:Charging Faults(38):Depleted Voltage Time(10)

• DF:Charge Control:Charging Faults(38):Depleted Recovery(11)

• DF:Charge Control:Charging Faults(38):Over Charge Capacity(13)

• DF:Charge Control:Charging Faults(38):Over Charge Recovery(15)

• DF:Charge Control:Charging Faults(38):Charge Timeout(17)

• DF:Charge Control:Charging Faults(38):Precharge Timeout(19)

• DF:Charge Control:Charging Faults(38):Charge Fault Cfg(21)

• DF:Configuration:Registers(64):Operation Cfg B(2)[NR]

• SBS:Voltage(0x09)

• SBS:Current(0x0a)

• SBS:AverageCurrent(0x0b)

• SBS:ChargingCurrent(0x14)

• SBS:BatteryStatus(0x16)[TDA],[TCA],[OCA]

• SBS:ChargingStatus(0x55)[LTCHG],[STCHG],[HTCHG]

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Table 2-13. Charging Faults (continued)

ChargingStatus Flag, Configuration Flag

Over Charge Capacity OR continuous amount of discharge of

Over Charge Recovery if [NR] = 1, OR RemainingCapacity ≤ FC Clear %

Depleted Voltage Time

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2.5.9 Discharge and Charge Alarms

The bq20z60-R1/bq20z65-R1 enables [TDA], [FD], [TCA] and [FC] flags in BatteryStatus to be set or cleared on the following thresholds based on RelativeStateOfCharge. All thresholds can be disabled by setting them to –1. FC Clear % should not be disabled by setting to –1.

RelativeStateOfCharge

The [TDA] and [FD] flags in BatteryStatus can also be set or cleared based on Voltage. If the voltage settings are not used, then they should be set to extreme range values.

≤TDA Volt Threshold for a period of TDA Volt Time and

Voltage

≤FD Volt Threshold for a period of FD Volt Time [FD] is set.

Discharge-Inhibit Mode

Threshold BatteryStatus Flag

≤TDA Set % and discharging [TDA] is set.

≥TDA Clear % [TDA] is cleared.

≤FD Set % [FD] is set.

≥FD Clear % [FD] is cleared.

≥TCA Set % [TCA] is set.

≤TCA Clear % [TCA] is cleared.

≥FC Set % [FC] is set.

≤FC Clear % [FC] is cleared.

Threshold BatteryStatus Flag

discharging

≥TDA Clear Volt [TDA] is cleared.

≥FD Clear Volt [FD] is cleared.

[TDA] is set.

Related Variables:

• DF:Charge Control:Termination Cfg.(36):TCA Set %(9)

• DF:Charge Control:Termination Cfg.(36):TCA Clear %(10)

• DF:Charge Control:Termination Cfg.(36):FC Set %(11)

• DF:Charge Control:Termination Cfg.(36):FC Clear %(12)

• DF:SBS Configuration:Configuration(49):TDA Set %(0)

• DF:SBS Configuration:Configuration(49):TDA Clear %(1)

• DF:SBS Configuration:Configuration(49):FD Set %(2)

• DF:SBS Configuration:Configuration(49):FD Clear %(3)

• DF:SBS Configuration:Configuration(49):TDA Set Volt Threshold(4)

• DF:SBS Configuration:Configuration(49):TDA Set Volt Time(6)

• DF:SBS Configuration:Configuration(49):TDA Clear Volt(7)

• DF:SBS Configuration:Configuration(49):FD Set Volt Threshold(9)

• DF:SBS Configuration:Configuration(49):FD Volt Time(11)

• DF:SBS Configuration:Configuration(49):FD Clear Volt(12)

• SBS:Voltage(0x09)

• SBS:RelativeStateOfCharge(0x0d)

2.6 Discharge-Inhibit Mode

The bq20z60-R1/bq20z65-R1 prevents discharging if Temperature > Hi Dsg Start Temp. When this happens, the bq20z60-R1/bq20z65-R1 goes into discharge inhibit mode. In discharge inhibit mode, discharging is disabled, and [XDSG], [DSGIN] in OperationStatus and [TDA] in BatteryStatus are set. The bq20z60-R1/bq20z65-R1 returns to normal mode and allows discharging if Temperature becomes less than or equal Hi Dsg Start Temp.

Related Variables:

• DF:1st Level Safety:Temperature(2):Hi Dsg Start Temp(20)

• SBS:Temperature(0x08)

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PermanentFailureDisplay

DisplayInactive

DISP L-H Transition

AND set

AND cleared

[PFD0]

[PFD1]

[SLED]

PermanentFailureDisplayontime

> 2 × LED

HoldTime

perpermanentfailurebitset

DisplayDisabled

[CUV] reset

[CUV] set

LEDsOFF

DisplaysPermanentFailureError

Code

DischargeDisplay

LEDsshowchargelevel

ANDif

[RCA]

isset,activeLEDsare

alsoflashing.

LEDs Active

LEDsOFF

Manufacturer

Access

LEDsON

Manufacturer

Access

LEDsOFF

ChargeDisplay

LEDsshowchargelevel AND highest

chargelevelLEDisblinking

ANDif

[RCA]

isset, allactiveLEDs

areflashing.

[

]

[PFD1]

[ ]

LEDHoldTime

set AND

cleared AND

heldfor

SLED

DISP

PFD0

ManufacturerAccess Display

OR setANDexitfromReset

OR isset AND isset

OR H-L Transition

[LEDR]

[LEDRCA] [RCA]

DISP

LEDHoldTime

expires

DsgMode

([DSG]

= 1)

Chg Mode

( =0)[DSG]

ChargeDisplay

LEDsshowchargelevel AND highest

chargelevelLEDisblinking

ORif

[RCA]

isset,LEDsareflashing.

[CHGLED

] set AND

ChargeMode

[CHGLED] set

ANDLeave

ChargeMode

OnlyLEDsdefinedin [LED1][LED0],

areswitchedon.

LED Display

• SBS:BatteryStatus(0x16)[TDA]

• SBS:OperationStatus(0x54)[XDSG],[DCHGIN]

2.7 LED Display

2.7.1 Display Activation

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Figure 2-12. Display Activation

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The LED display is activated with a High to Low (H-L) transition at the DISP pin. The following flags configure additional display activation settings. If [CUV] or [PUV] flags are set, the display is disabled.

LEDR — Set this flag to activate the display on exit from reset. LEDRCA— Set this flag to let all active LEDs flash with LED Flash Period if [RCA] flag is set. CHGLED— Set this flag to let the display stay activated during charging. PFD1, PFD0— If [PFD0] is set, the permanent failure can be activated in two different ways depending on

LEDs ON, LEDs OFF, Display ON— The display can be tested with these ManufacturerAccess

Related Variables:

• DF:Configuration:Registers(64):Operation Cfg A(0)[LEDR],[LEDRCA],[CHGLED]

• DF:Configuration:Registers(64):Operation Cfg B(2)[PFD1],[PFD0]

• DF:LED Support:LED Cfg(67):LED Hold Time(6)

• SBS:ManufacturerAccess(0x00):LEDs ON(0x0032)

• SBS:ManufacturerAccess(0x00):LEDs OFF(0x0033)

• SBS:ManufacturerAccess(0x00):Display ON(0x0034)

• SBS:BatteryStatus(0x16)[RCA]

• SBS:SafetyStatus(0x51)[CUV],[PUV]

• SBS:PFStatus(0x53)

LED Display

the [PFD1] flag. If [PFD1] is cleared, the permanent failure display is active after normal capacity display, if DISP is held low after H-L transition for LED Hold Time period. If [PFD1] is set, the permanent failure display is activated with a H-L transition at DISP pin. The permanent failure display stays active 2 × LED Hold Time for each flag set in PFStatus register. See "Permanent Failure Error Codes" chapter for available error codes.

commands, LEDs ON and LEDs OFF switches all configured LEDs on or off. The Display ON command simulates a H-L transition at the DISP pin.

2.7.2 Display Configuration

The following parameters configures the display in various ways. DMODE— The charge level display can be configured to show either relative state of charge or absolute

state of charge.

LED1, LED0 — These bits configure the number of LEDs and the charge threshold levels used in the

LED display. The bq20z90/bq20z95 can use predefined charge levels for 3,4, or 5 LEDs or user defined levels.

SLED — The serial LED option can be used to implement a much brighter display at the expense of

additional hardware components. With the parallel connection, the 3.3 V output from the bq29330 is used to power the LEDs. Using that approach, current in each LED should be limited to 3 mA maximum. With the serial option, all LEDs can be powered from the battery voltage and driven in series through a simple constant current regulator. The current is then diverted to ground at the various nodes between the series LEDs in order to program the desired pattern.

LED Blink Period— During charging, the top LED segment flashes with the LED Blink Period; e.g. if

battery charge is 36% and the display uses 5 LEDs, LED 2 will blink. [LEDRCA], CHG Flash Alarm and DSG Flash Alarm will override this setting if active.

LED Flash Period— During discharge alarm, the remaining LED segments flash with LED Flash Period;

e.g. if battery charge is 36% and the display uses 5 LEDs, LED 1 and LED 2 will blink.

LED Delay— An activation delay from one LED to another LED can be set with this value. LED Hold Time— After display activation the display will stay on LED Hold Time period. The permanent

failure display will stay on double the LED Hold Time period for each permanent failure bit set.

Related Variables:

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LED Display

• DF:Configuration:Registers(64):Operation Cfg A(0)[DMODE],[LED1],[LED0],[SLED],[LEDRCA]

• DF:LED Support:LED Cfg(67):LED Flash Period(0)

• DF:LED Support:LED Cfg(67):LED Blink Period(2)

• DF:LED Support:LED Cfg(67):LED Delay(4)

• DF:LED Support:LED Cfg(67):LED Hold Time(6)

• SBS:RelativeStateOfCharge(0x0d)

• SBS:AbsoluteStateOfCharge(0x0e)

2.7.3 Display Format

The bq20z60-R1/bq20z65-R1 can show state of charge using the LED display. Predefined levels for 3, 4 or 5 LEDs or user configurable levels can be selected. State of charge levels can be configured for charging and discharging.

If the display is activated during charging the display shows the state of charge and the top LED segment flashes at the rate of LED Blink Period (eg: if RelativeStateOfCharge = 36% and 5 LEDs are being used then LED2 will blink). The blinking is overriden with CHG Flash Alarm or [LEDRCA]

If state of charge falls below the flash alarm level, all remaining active LEDs will flash at the LED Flash Period. The flash alarm can be disabled by setting it to -1.

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Related Variables:

• DF:Configuration:Registers(64):Operation Cfg A(0)[DMODE],[LED1],[LED0],[LEDRCA]

• DF:LED Support:LED Cfg(67):LED Flash Period(0)

• DF:LED Support:LED Cfg(67):LED Blink Period(2)

• DF:LED Support:LED Cfg(67):CHG Flash Alarm(7)

• DF:LED Support:LED Cfg(67):CHG Thresh 1(8)

• DF:LED Support:LED Cfg(67):CHG Thresh 2(9)

• DF:LED Support:LED Cfg(67):CHG Thresh 3(10)

• DF:LED Support:LED Cfg(67):CHG Thresh 4(11)

• DF:LED Support:LED Cfg(67):CHG Thresh 5(12)

• DF:LED Support:LED Cfg(67):DSG Flash Alarm(13)

• DF:LED Support:LED Cfg(67):DSG Thresh 1(14)

• DF:LED Support:LED Cfg(67):DSG Thresh 2(15)

• DF:LED Support:LED Cfg(67):DSG Thresh 3(16)

• DF:LED Support:LED Cfg(67):DSG Thresh 4(17)

• DF:LED Support:LED Cfg(67):DSG Thresh 5(18)

• SBS:RelativeStateOfCharge(0x0d)

• SBS:AbsoluteStateOfCharge(0x0e)

• SBS:BatteryStatus(0x16)[DSG]

LED Display

Table 2-14. Display Charge Level Threshold

LED1, LED0 Setting: 3 LED 4 LED 5 LED USER Threshold Level: charge + discharge level charging level discharging level

Flash Alarm active 0% - 10% 0% - 10% 0% - 10% 0% - CHG Flash Alarm 0% - DSG Flash Alarm LED 1 active 0% - 100% 0% - 100% 0% - 100% CHG Thresh 1 - 100% DSG Thresh 1 - 100% LED 2 active 34% - 100% 25% - 100% 20% - 100% CHG Thresh 2 - 100% DSG Thresh 2 - 100% LED 3 active 67% - 100% 50% - 100% 40% - 100% CHG Thresh 3 - 100% DSG Thresh 3 - 100% LED 4 active - 75% - 100% 60% - 100% CHG Thresh 4 - 100% DSG Thresh 4 - 100% LED 5 active - - 80% - 100% CHG Thresh 5 - 100% DSG Thresh 5 - 100%

2.7.4 Permanent Failure Error Codes

When a permanent failure occurs, the type of permanent failure error can be shown on the display. The table below shows available error codes. The permanent failure display requires proper setting of [PFD1] and [PFD0] bits. The permanent failure code display is disabled if [SLED] bit is set. The LED Flash Period and LED Blink Period are fixed for these errors and not affected by the LED Data Flash settings.

PFStatus LED3 LED2 LED1

[SOPT2] Flashing with LED Flash Period Off Flashing with LED Blink Period [SOT2D] On Off Flashing with LED Blink Period [SOT2C] Off Off Flashing with LED Blink Period

[CIM_A] Flashing with LED Flash Period Flashing with LED Blink Period Flashing with LED Flash Period

[FBF] On Flashing with LED Blink Period Flashing with LED Flash Period

[VSHUT] Off Flashing with LED Blink Period Flashing with LED Flash Period

[SUV] Flashing with LED Flash Period Flashing with LED Blink Period On

[SOPT1] On Flashing with LED Blink Period On

[SOCD] Off Flashing with LED Blink Period On

[SOCC] Flashing with LED Flash Period Flashing with LED Blink Period Off [AFE_P] On Flashing with LED Blink Period Off [AFE_C] Off Flashing with LED Blink Period Off

[DFF] Flashing with LED Blink Period Flashing with LED Flash Period Flashing with LED Flash Period

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Device Operating Mode

PFStatus LED3 LED2 LED1

[DFETF] Flashing with LED Blink Period On Flashing with LED Flash Period [CFETF] Flashing with LED Blink Period Off Flashing with LED Flash Period

[CIM_R] Flashing with LED Blink Period Flashing with LED Flash Period On [SOT1D] Flashing with LED Blink Period On On [SOT1C] Flashing with LED Blink Period Off On

[SOV] Flashing with LED Blink Period Flashing with LED Flash Period Off

[PFIN] Flashing with LED Blink Period On Off

None Flashing with LED Blink Period Off Off

Related Variables:

• DF:Configuration:Registers(64):Operation Cfg B(2)[PFD1],[PFD0]

• DF:LED Support:LED Cfg(67):LED Flash Period(0)

• DF:LED Support:LED Cfg(67):LED Blink Period(2)

2.7.5 LED Current Configuration

The sink current setting of the LED inputs to the bq20z60-R1/bq20z65-R1 can be programmed with the following settings. All of the LEDs are programmed with the same current level.

ILED1 ILED0 Sink Current

0 0 0 mA 0 1 3 mA 1 0 4 mA 1 1 5 mA (default)

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Table 2-15. LED Current Configuration

Related Variables:

• DF:LED Support:LED Cfg(67):Sink Current(19)

2.8 Device Operating Mode

The bq20z60-R1/bq20z65-R1 has several device power modes. During these modes, the bq20z60-R1/bq20z65-R1 modifies its operation to minimize power consumption from the battery.

2.8.1 Normal Mode

During normal operation, the bq20z60-R1/bq20z65-R1 takes Current, Voltage, and Temperature measurements, performs calculations, updates SBS data, and makes protection and status decisions at 1-second intervals. Between these periods of activity, the bq20z60-R1/bq20z65-R1 is in a reduced-power state.

PRES is sampled once per second and if PRES is high, the OperationStatus [PRES] flag is cleared. If PRES is low, the OperationStatus [PRES] flag is set, indicating the system is present (the battery is inserted).

If the [NR] bit is set, the PRES input can be left floating, as it is not monitored.

Related Variables:

• DF:Configuration:Registers(64):Operation Cfg B(2)[NR]

• SBS:OperationStatus(0x54)[PRES]

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2.8.2 Battery Pack Removed Mode/System Present Detection

2.8.2.1 Battery Pack Removed

The bq20z60-R1/bq20z65-R1 detects the Battery Pack Removed mode if the [NR] bit is set to 0 AND the PRES input is high ([PRES] = 0).

On entry to the Battery Pack Removed mode, the [TCA] and [TDA] flags in BatteryStatus are set, ChargingCurrent and ChargingVoltage are set to 0, the CHG and DSG FETs are turned off, and the ZVCHG FET is turned off (if used).

Polling of the PRES pin continues at a rate of once every 1 s. The bq20z60-R1/bq20z65-R1 exits the Battery Pack Removed state if the [NR] flag is set to 0 AND the

PRES input is low ([PRES] = 1). When this occurs, the [TCA] and [TDA] flags in BatteryStatus are reset.

Related Variables:

• DF:Configuration:Registers(64):Operation Cfg B(2)[NR]

• SBS:BatteryStatus(0x16)[TCA],[TDA]

• SBS:OperationStatus(0x54)[PRES]

2.8.2.2 System Present

PRES is sampled once per second, and if PRES is high, the OperationStatus [PRES] flag is cleared. If PRES is low, the OperationStatus [PRES] flag is set, indicating the system is present (the battery is inserted). If the [NR] bit is set, the PRES input is ignored and can be left floating.

Related Variables:

• DF:Configuration:Registers(64):Operation Cfg B(2)[NR]

• SBS:OperationStatus(0x54)[PRES]

Device Operating Mode

2.8.3 Sleep Mode

In Sleep mode, the bq20z60-R1/bq20z65-R1 measures Voltage and Temperature in Sleep Voltage Time intervals and Current at Sleep Current Time intervals. At each interval the bq20z60-R1/bq20z65-R1 performs calculations, updates SBS data, and makes protection and status decisions. Between these periods of activity, the bq20z60-R1/bq20z65-R1 is in a reduced-power state.

The bq20z60-R1/bq20z65-R1 enters Sleep mode when the following conditions exist:

• If the [NR] bit is set to 0, [PRES] must also be set to 0 for the bq20z60-R1/bq20z65-R1 to enter sleep. AND one of the following conditions:

• (|Current| ≤ Sleep Current) AND (SMBus is low for Bus Low Time) AND (the [SLEEP] bit is set) OR

• (|Current| ≤ Sleep Current) AND (ManufacturerAccess Sleep command is received) AND (the [SLEEP] bit is set).

Entry to Sleep mode is blocked if any of the PFStatus flags is set. On entry to sleep, if [NR] = 0, the CHG and DSG FETs are turned off, and the ZVCHG FET is turned off

(if used), regardless of the [NRCHG] setting. If [NR] = 1, the CHG FET is turned off, and the ZVCHG FET is turned off (if used). However, if [NRCHG] is set, then the CHG FET remains on.

Also, on entry to Sleep mode, the autocalibration of the ADC begins. However, if Temperature ≤ Cal Inhibit Temp Low or Temperature ≥ Cal Inhibit Temp High, autocalibration is not started on entry to sleep mode. The activation of autocalibration is not affected by the state of [SLEEP], Sleep Voltage Time, Sleep Current Time, or Current.

Additionally, if sleep mode is entered in response to ManufacturerAccess Sleep command, then the ADC autocalibration is not performed.

The bq20z60-R1/bq20z65-R1 exits Sleep mode when one or more of the following conditions exist:

• If the [NR] bit is set to 0 and [PRES] is set to 1.

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Device Operating Mode

• |Current| > Sleep Current

• SMBC or SMBD input transitions high

• Any current related flag is set in SafetyStatus

• [OC], [CMTO], [OCHGV], [OCHGI], and [XCHGLV] flags in ChargingStatus are set

• Wake function enabled by setting Wake Current Reg and a voltage across SRP and SRN is detected

The bq20z60-R1/bq20z65-R1 exits Sleep mode if the absolute value of Current is greater than Sleep Current, OR the SMBC or SMBD input transitions high, OR any OperationStatus, ChargingStatus, or SafetyStatus flags change state.

In addition, if [NR] is cleared, the bq20z60-R1/bq20z65-R1 exits Sleep mode when [PRES] = 1.

Related Variables:

• DF:Configuration:Registers(64):Operation Cfg A(0)[SLEEP]

• DF:Configuration:Registers(64):Operation Cfg B(2)[NR],[NRCHG]

• DF:Power:Power(68):Sleep Current(10)

• DF:Power:Power(68):Bus Low Time(12)

• DF:Power:Power(68):Cal Inhibit Temp Low(13)

• DF:Power:Power(68):Cal Inhibit Temp Low(15)

• DF:Power:Power(68):Sleep Voltage Time(17)

• DF:Power:Power(68):Sleep Current Time(18)

• DF:Power:Power(68):Wake Current Reg(19)

• SBS:ManufacturerAccess(0x00):Sleep(0x0011)

• SBS:Current(0x0a)

• SBS:SafetyStatus(0x51)

• SBS:OperationStatus(0x54)[PRES]

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2.8.4 Wake Function

The bq20z60-R1/bq20z65-R1 can exit sleep mode, if enabled, by the presence of a voltage across SRP and SRN. The level of the current signal needed is programmed in Wake Current Reg.

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Low Byte RSVD RSVD RSVD RSVD RSVD IWAKE RSNS1 RSNS0

LEGEND: RSVD = Reserved and must be programmed to 0

Figure 2-13. Wake Current Reg

IWAKE— This bit sets the current threshold for the Wake function.

0 = 0.5 A (or if RSNS0 = RSNS1 = 0, then this function is disabled) 1 = 1 A (or if RSNS0 = RSNS1 = 0, then this function is disabled)

Table 2-16. Wake Current Reg

RSNS1 RSNS0 Resistance

0 0 Disabled (default) 0 1 2.5 mΩ 1 0 5 mΩ 1 1 10 mΩ

Related Variables:

• DF:Configuration:Registers(64):Operation Cfg A(0)[SLEEP]

• DF:Power:Power(68):Wake Current Reg(19)

• SBS:Current(0x0a)

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2.8.5 Shutdown Mode

The bq20z60-R1/bq20z65-R1 enters Shutdown mode if the following conditions are met:

• [SHUTV] in Operation Cfg C is set to 0 AND Voltage ≤ Shutdown Voltage AND Current ≤ 0 for a period of Cell Shutdown Time

• [SHUTV] in Operation Cfg C is set to 1 AND Min(CellVoltage4..1) ≤ Cell Shutdown Voltage AND Current ≤ 0 for a period of Shutdown Time

• (ManufacturerAccess shutdown command received AND Current = 0) AND PackVoltage < Charger Present threshold.

When the bq20z60-R1/bq20z65-R1 meets these conditions, the CHG, DSG, and ZVCHG FETs are turned off, and the AFE is commanded to shut down. In Shutdown mode, the bq20z60-R1/bq20z65-R1 is completely powered down because its supply is removed.

To exit Shutdown mode, the PACK voltage must be greater than its minimum operating voltage. When this occurs, the AFE returns power to the bq20z60-R1/bq20z65-R1, the [WAKE] flag is set, and the AFE is configured. The [WAKE] flag is cleared after approximately 1 s when all SBS parameters have been measured and updated.

Related Variables:

• DF:Power:Power(68):Shutdown Voltage(2)

• DF:Power:Power(68):Shutdown Time(4)

• DF:Power:Power(68):Cell Shutdown Voltage(5)

• DF:Power:Power(68):Cell Shutdown Time(7)

• DF:Power:Power(68):Charger Present(8)

• DF:Configuration:Registers(64):Operation Cfg B(2)[NR]

• DF:Configuration:Registers(64):Operation Cfg C(4)[SHUTV]

• SBS:Voltage(0x09)

• SBS:Current(0x0a)

• SBS:CellVoltage4..1(0x3c..0x3f)

• SBS:OperationStatus(0x54)[PRES],[WAKE]

• SBS:PackVoltage(0x5a)

Security (Enables and Disables Features)

2.8.6 Ship Mode

While in sealed mode, the bq20z60-R1/bq20z65-R1 enters ship mode if ManufacturerAccess (MAC) shutdown command (0x0010) is received 2 consecutive times AND PackVoltage < Charger Present threshold AND no safety conditions. The 2 MAC writes cannot have any other MAC commands following or between them. After the bq20z60-R1/bq20z65-R1 receives the 2 consecutive MAC (0x0010) commands, the CHG, DSG, and ZVCHG FETs are turned off after Sealed Ship Delay time period. After the passage of another Sealed Ship Delay period, ship mode is entered (i.e. after a time period which 2 times Sealed Ship Delay). For example, if Sealed Ship Delay is set to 5 seconds, then 5 seconds after receiving the 2 MAC (0x0010) commands the FETs will turn off, and 10 seconds after receiving the 2 commands, the bq20z60-R1/bq20z65-R1 will enter ship mode.

Related Variables:

• DF:Power:Power(68):Charger Present(8)

• DF:Power:Power(68):Sealed Ship Delay(20)

• SBS:PackVoltage(0x5a)

2.9 Security (Enables and Disables Features)

There are three levels of secured operation within the bq20z60-R1/bq20z65-R1. To switch between the levels, different operations are needed with different codes. The three levels are Sealed, Unsealed, and Full Access.

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Security (Enables and Disables Features)

1. Full Access or Unsealed to Sealed— The use of the Seal Device command instructs the

bq20z60-R1/bq20z65-R1 to limit access to the SBS functions and data flash space and sets the [SS] flag. In sealed mode, standard SBS functions have access per the Smart Battery Data Specification, Appendix A. Extended SBS functions and data flash are not accessible. Once in sealed mode, the part can never permanently return to Unsealed or Full Access modes.

2. Sealed to Unsealed— Instructs the bq20z60-R1/bq20z65-R1 to extend access to the SBS and data

flash space and clears the [SS] flag. In unsealed mode, all data, SBS, and DF have read/write access. Unsealing is a two-step command performed by writing the first word of the UnSealKey to ManufacturerAccess followed by the second word of UnSealKey to ManufacturerAccess. The unseal key can be read and changed via the extended SBS block command UnSealKey when in Full Access Mode. To return to the Sealed mode, either a hardware reset is needed, or the ManufacturerAccess seal device command is needed to transit from Full Access or Unsealed to Sealed.

3. Unsealed to Full Access— Instructs the bq20z60-R1/bq20z65-R1 to allow full access to all SBS

commands and data flash. The bq20z60-R1/bq20z65-R1 is shipped from TI in this mode. The keys for Unsealed to Full Access can be read and changed via the extended SBS block command FullAccessKey when in Full Access mode. Changing from Unsealed to Full Access is performed by using the ManufacturerAccess command, by writing the first word of FullAccessKey to ManufacturerAccess followed by the second word of the FullAccessKey to ManufacturerAccess. The full access key can be read and changed via the extended SBS block command FullAccessKey when in Full Access Mode. In Full Access mode, the command to go to boot ROM can be sent.

Related Variables:

• SBS:ManufacturerAccess(0x00):Seal Device(0x0020)

• SBS:OperationStatus(0x54)[SS],[FAS]

• SBS:UnSealKey(0x60)

• SBS:FullAccessKey(0x61)

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Full AccessMode

UnsealedMode

SealedMode

NoDataFlash Access

StandardSBSCommands

DataFlashRead

/Write Access

StandardSBSCommands

SomeExtendedSBSCommands

DataFlashRead

/Write Access

StandardSBSCommands

AllExtendedSBSCommands

BootROM

Devicecanbereprogrammed

Write 0x0f00 to

ManufacturerAcces

FullHardware

ResetORwriting

0x08

toSMBus

Writelowerpartof

FullAccessKey

+ higherpartof

FullAccessKey

ManufacturerAccess

SealDevice

Command

SealDevice

Command

Writelowerpartof

UnsealKey

+ higherpartof

UnsealKey

ManufacturerAccess

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Security (Enables and Disables Features)

Figure 2-14. Security

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Calibration

2.10 Calibration

2.10.1 Coulomb-Counter Dead Band

The bq20z60-R1/bq20z65-R1 does not accumulate charge or discharge for gas gauging when the current input is below the dead-band current threshold. The threshold is programmed in CC Deadband (coulomb-counter dead band) and should be set sufficiently high to prevent false signal detection with no charge or discharge flowing through the sense resistor.

Related Variable:

• DF:Calibration:Current(107):CC Deadband(1)

2.10.2 Autocalibration

The bq20z60-R1/bq20z65-R1 provides an autocalibration feature to cancel the voltage offset error across SRP and SRN for maximum charge measurement accuracy. The bq20z60-R1/bq20z65-R1 performs autocalibration when the SMBus lines stay low continuously for a minimum of 5 s and Temperature is within bounds of Cal Inhibit Temp Low and Cal Inhibit Temp High.

Related Variables:

• DF:Power:Power(68):Cal Inhibit Temp Low(13)

• DF:Power:Power(68):Cal Inhibit Temp High(15)

• SBS:Temperature(0x08)

2.11 Communications

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The bq20z60-R1/bq20z65-R1 uses SMBus v1.1 with master mode and packet error checking (PEC) options per the SBS specification.

2.11.1 SMBus On and Off States

The bq20z60-R1/bq20z65-R1 detects an SMBus off state when SMBC and SMBD are logic-low for ≥ 2 seconds. Clearing this state requires either SMBC or SMBD to transition high. Within 1 ms, the communication bus is available.

2.11.2 Packet Error Checking

The bq20z60-R1/bq20z65-R1 can receive or transmit data with or without PEC. In the write-word protocol, if the host does not support PEC, the last byte of data is followed by a stop

condition. If the host does not support PEC, the [HPE] bit should be set to 0 (default). In the write-word protocol, the bq20z60-R1/bq20z65-R1 receives the PEC after the last byte of data from

the host. If the host does not support PEC, the last byte of data is followed by a stop condition. After receipt of the PEC, the bq20z60-R1/bq20z65-R1 compares the value to its calculation. If the PEC is correct, the bq20z60-R1/bq20z65-R1 responds with an ACKNOWLEDGE. If it is not correct, the bq20z60-R1/bq20z65-R1 responds with a NOT ACKNOWLEDGE and sets an error code. If the host supports PEC, the [HPE] bit should be set to 1.

In the read-word and block-read in master mode, the host generates an ACKNOWLEDGE after the last byte of data sent by the bq20z60-R1/bq20z65-R1. The bq20z60-R1/bq20z65-R1 then sends the PEC, and the host, acting as a master receiver, generates a NOT ACKNOWLEDGE and a stop condition.

Related Variable:

• DF:Configuration:Registers(64):Operation Cfg B(2)[HPE]

2.11.3 bq20z60-R1/bq20z65-R1 Slave Address

The bq20z60-R1/bq20z65-R1 uses address 0x16 on the SMB for communication.

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2.11.4 Broadcasts to Smart Charger and Smart Battery Host

The bq20z60-R1/bq20z65-R1 can broadcast messages to the smart battery charger and smart battery host. This can be enabled with the [BCAST] bit.

The PEC byte for alarm transmissions to the charger in master mode can be enabled with the [CPE] bit. The PEC byte for alarm transmissions in master mode to the smart battery host and the PEC byte for

receiving communications from all sources in slave mode can be enabled with the [HPE] bit.

Related Variable:

• DF:Configuration:Registers(64):Operation Cfg B(2)[CPE],[HPE],[BCAST]

Communications

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Detailed Description SLUU386–January 2010

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The bq20z60-R1/bq20z65-R1 SBS command set meets the SBD v1.1 specification. All SBS values are updated in 1-second intervals.

A.1 ManufacturerAccess (0x00)

This read- or write-word function provides battery system-level data, access to test controls, and security features.

SBS Cmd.

0x00 R/W ManufacturerAccess Hex 2 0x0000 0xffff – –

Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

A.1.1 System Data

The results of these commands must be read from ManufacturerAccess after a write with the command word to ManufacturerAccess.

Appendix A

SLUU386–January 2010

Standard SBS Commands

Table A-1. ManufacturerAccess

A.1.1.1 Device Type (0x0001)

Returns the IC part number.

Manufacturer Access Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x0001 R Device Type Hex 2 – – 0x0600 –

A.1.1.2 Firmware Version (0x0002)

Returns the firmware version. The format is most-significant byte (MSB) = decimal integer, and the least-significant byte (LSB) = sub-decimal integer, e.g., 0x0120 = version 01.20.

Manufacturer Access Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x0002 R Firmware Version Hex 2 – – – –

A.1.1.3 Hardware Version (0x0003)

Returns the hardware version stored in a single byte of reserved data flash. e.g., 0x00a7 = version A7.

Manufacturer Access Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x0003 R Hardware Version Hex 2 – – 0x00a7 –

Table A-2. Device Type

Table A-3. Firmware Version

Table A-4. Hardware Version

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ManufacturerAccess (0x00)

A.1.1.4 DF Checksum (0x0004)

This function is only available when the bq20z60-R1/bq20z65-R1 is in unsealed mode or full access mode, indicated by the [SS] and [FAS] flags. A write to this command forces the bq20z60-R1/bq20z65-R1 to generate a checksum of the full data flash (DF) array. The generated checksum is then returned within 45 ms.

NOTE: If another SMBus command is received while the checksum is being generated, the DF

checksum is generated, but the response may be a time-out (<25 ms).

Manufacturer Access Mode Name Format Size in Bytes Min Value Default Value Unit

0x0004 R DF Checksum Hex 2 – – – –

A.1.1.5 Manufacturer Status (0x0006)

This function is available while the bq20z60-R1/bq20z65-R1 is in normal operation. This 16-bit word reports the battery status.

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

High Byte FET1 FET0 PF1 PF0 STATE3 STATE2 STATE1 STATE0

Low Byte 0 0 0 0 1 0 1 0

LEGEND: All bits are read-only.

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Table A-5. DF Checksum

Max Value

Figure A-1. Manufacturer Status

FET1, FET0— Indicates the state of the charge and discharge FETs

0,0 = Both charge and discharge FETs are on. 0,1 = CHG FET is off, DSG FET is on. 1,0 = Both charge and discharge FETs are off. 1,1 = CHG FET is on, DSG FET is off.

PF1, PF0— Indicates permanent failure cause when permanent failure is indicated by STATE3..STATE0

0,0 = Fuse is blown if enabled via DF:Configuration:Register(64):Permanent Fail Cfg(6),

Permanent Fail Cfg 2(8) 0,1 = Cell imbalance failure 1,0 = Safety voltage failure 1,1 = FET failure

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STATE3, STATE2, STATE1, STATE0— Indicates the battery state.

0,0,0,0 = Wake Up 0,0,0,1 = Normal Discharge 0,0,1,1 = Pre-Charge 0,1,0,1 = Charge 0,1,1,1 = Charge Termination 1,0,0,0 = Fault Charge Terminate 1,0,0,1 = Permanent Failure 1,0,1,0 = Overcurrent 1,0,1,1 = Overtemperature 1,1,0,0 = Battery Failure 1,1,0,1 = Sleep 1,1,1,0 = Discharge Prohibited 1,1,1,1 = Battery Removed

A.1.1.6 Chemistry ID (0x0008)

Returns the OCV table chemistry ID of the battery. The default table ID is 0x0100. For a list of OCV chemistry IDs, see the Support of Multiple Li-Ion Chemistries With Impedance Track Gas Gauges application note (SLUA372).

ManufacturerAccess (0x00)

Manufacturer Access Mode Name Format Unit

0x0008 R Chemistry ID Hex 2 0x0000 0xffff 0x0100 –

A.1.2 System Control

The commands in this section cause the bq20z60-R1/bq20z65-R1 to take actions when written. No data is returned.

A.1.2.1 Shutdown (0x0010)

Instructs the bq20z60-R1/bq20z65-R1 to verify and enter shutdown mode (when the bq20z60-R1/bq20z65-R1 is in Unsealed or Full Access mode). This command is only available when the bq20z60-R1/bq20z65-R1 is in Unsealed or Full Access mode. Shutdown is not entered unless the PackVoltage < Charger Present and Current ≤ 0.

In sealed mode, if the shutdown command (0x0010) is received 2 consecutive times, the bq20z60-R1/bq20z65-R1 enters ship mode. The 2 MAC writes cannot have any other MAC commands following or between them. For bq20z60-R1/bq20z65-R1 to enter ship mode, PackVoltage must be less than Charger Present threshold AND there are no safety conditions.

Related Variables:

• DF:Power:Power(68):Charger Present(8)

• SBS:Current(0x0a)

• SBS:OperationStatus(0x54)[SS],[FAS]

• SBS:PackVoltage(0x5a)

Table A-6. Chemistry ID

Size in Min Max Default Bytes Value Value Value

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ManufacturerAccess (0x00)

A.1.2.2 Sleep (0x0011)

Instructs the bq20z60-R1/bq20z65-R1 to verify and enter sleep mode if no other command is sent after the Sleep command. Any SMB transition wakes up the bq20z60-R1/bq20z65-R1. It takes about 1 minute before the device goes to sleep. This command is only available when the bq20z60-R1/bq20z65-R1 is in Unsealed or Full Access mode.

Related Variables:

• DF:Configuration:Registers(64):Operation Cfg A(0)[SLEEP]

• SBS:OperationStatus(0x54)[SS],[FAS]

A.1.2.3 Seal Device (0x0020)

Instructs the bq20z60-R1/bq20z65-R1 to limit access to the extended SBS functions and data flash space, sets the [SS] flag, and clears the [FAS] flag.

This command is only available when the bq20z60-R1/bq20z65-R1 is in Unsealed or Full Access mode. See Security, Section 2.9, for detailed information.

Related Variable:

• SBS:OperationStatus(0x54)[SS],[FAS]

A.1.2.4 IT Enable (0x0021)

This command forces the bq20z60-R1/bq20z65-R1 to begin the Impedance Track algorithm, changes Update Status, and sets the [QEN] flag.

This command is only available when the bq20z60-R1/bq20z65-R1 is in Unsealed or Full Access mode.

Related Variables:

• DF:Gas Gauging:State(82):Update Status(12)

• SBS:OperationStatus(0x54)[VOK],[QEN],[SS],[FAS]

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A.1.2.5 SAFE Activation (0x0030)

This command drives the SAFE pin high. This command is only available when the bq20z60-R1/bq20z65-R1 is in Unsealed or Full Access mode.

Related Variable:

• SBS:OperationStatus(0x54)[SS],[FAS]

A.1.2.6 SAFE Clear (0x0031)

This command sets the SAFE pin back to low. This command is only available when the bq20z60-R1/bq20z65-R1 is in Unsealed or Full Access mode.

Related Variable:

• SBS:OperationStatus(0x54)[SS],[FAS]

A.1.2.7 LEDs ON (0x0032)

Activates all configured LEDs to stay on. This command is only available when the bq20z60-R1/bq20z65-R1 is in Unsealed or Full Access mode.

Related Variables:

• DF:Configuration:Registers(64)Operation Cfg A(0)[LED1],[LED0]

• SBS:OperationStatus(0x54)[SS],[FAS]

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A.1.2.8 LEDs OFF (0x0033)

Deactivates all configured LEDs. This command is only available when the bq20z60-R1/bq20z65-R1 is in Unsealed or Full Access mode.

ManufacturerAccess (0x00)

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ManufacturerAccess (0x00)

Related Variables:

• DF:Configuration:Registers(64)Operation Cfg A(0)[LED1],[LED0]

• SBS:OperationStatus(0x54)[SS],[FAS]

A.1.2.9 Display ON (0x0034)

Simulates a H-L transition at DISP pin and activates the LED display to show charge level. This command is only available when the bq20z60-R1/bq20z65-R1 is in Unsealed or Full Access mode.

Related Variable:

• SBS:OperationStatus(0x54)[SS],[FAS]

A.1.2.10 Calibration Mode (0x0040)

Places the bq20z60-R1/bq20z65-R1 into calibration mode. See the Data Flash Programming and Calibrating the bq20zxx Family of Gas Gauges, application report (SLUA379A) for further details.

This command is only available when the bq20z60-R1/bq20z65-R1 is in Unsealed or Full Access mode.

Related Variable:

• SBS:OperationStatus(0x54)[SS],[FAS]

A.1.2.11 Reset (0x0041)

The bq20z60-R1/bq20z65-R1 undergoes a full reset. The bq20z60-R1/bq20z65-R1 holds the clock line down for a few milliseconds to complete the reset

This command is only available when the bq20z60-R1/bq20z65-R1 is in Unsealed or Full Access mode.

Related Variable:

• SBS:OperationStatus(0x54)[SS],[FAS]

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A.1.2.12 BootROM (0x0f00)

The bq20z60-R1/bq20z65-R1 goes into BootROM mode. This command is only available when the bq20z60-R1/bq20z65-R1 is in Full Access mode.

Related Variable:

• SBS:OperationStatus(0x54)[FAS]

A.1.2.13 Permanent Fail Clear (PFKey)

This two-step command must be written to ManufacturerAccess in following order: first word of the PFKey first, followed by the second word of the PFKey. If the command fails, 4 seconds must pass before the command can be reissued.

This command instructs the bq20z60-R1/bq20z65-R1 to clear the PFStatus, clear the [PF] flag, clear the Fuse Flag, reset the SAFE pin, and unlock the data flash for writes.

This command is only available when the bq20z60-R1/bq20z65-R1 is in Unsealed or Full Access mode.

Related Variables:

• DF:PF Status:Device Status Data(96):Saved PF Flags 1(0), Saved PF Flags 2(2)

• DF:PF Status:Device Status Data(96):Fuse Flag(2)

• SBS:SafetyStatus(0x51)[PF]

• SBS:PFStatus(0x53)

• SBS:OperationStatus(0x54)[SS],[FAS]

• SBS:PFKey(0x62)

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NOTE: The higher word must be immediately followed by the lower word. If the clear command

fails, the command can only be repeated 4 seconds after the previous attempt. If communication other than the lower word occurs after the first word is sent, the Permanent Fail Clear command fails.

A.1.2.14 Unseal Device (UnsealKey)

Instructs the bq20z60-R1/bq20z65-R1 to enable access to the SBS functions and data flash space and clear the [SS] flag. This two-step command must be written to ManufacturerAccess in the following order: first word of the UnSealKey first, followed by the second word of the UnSealKey. If the command fails, 4 seconds must pass before the command can be reissued.

This command is only available when the bq20z60-R1/bq20z65-R1 is in Sealed mode. SeeSecurity, Section 2.9, for detailed information.

Related Variables:

• SBS:OperationStatus(0x54)[SS]

• SBS:UnSealKey(0x60)

A.1.2.15 Full Access Device (FullAccessKey)

Instructs the bq20z60-R1/bq20z65-R1 to enable full access to all SBS functions and data flash space and set the [FAS] flag. This two-step command must be written to ManufacturerAccess in the following order: first word of the FullAccessKey first, followed by the second word of the FullAccessKey.

This command is only available when the bq20z60-R1/bq20z65-R1 is in Unsealed mode. See Security, Section 2.9, for detailed information.

Related Variables:

• SBS:OperationStatus(0x54)[SS],[FAS]

• SBS:FullAccessKey(0x61)

ManufacturerAccess (0x00)

A.1.3 Extended SBS Commands

Also available via ManufacturerAccess in the sealed mode are some of the extended SBS commands. The commands available are listed as follows.

The result of these commands must be read from ManufacturerAccess after a write to ManufacturerAccess.

0x0046 = SBS:FETControl(0x46) (Read Only) 0x0050 = SBS:SafetyAlert(0x50) 0x0051 = SBS:SafetyStatus(0x51) 0x0052 = SBS:PFAlert(0x52) 0x0053 = SBS:PFStatus(0x53) 0x0054 = SBS:OperationStatus(0x54) 0x0055 = SBS:ChargingStatus(0x55) 0x0057 = SBS:ResetData(0x57) 0x0058 = SBS:WDResetData(0x58) 0x005a = SBS:PackVoltage(0x5a) 0x005d = SBS:AverageVoltage(0x5d) 0x0069 = SBS:SafetyStatus2(0x69) 0x006b = SBS:PFStatus2(0x6b)

0x006c = SBS:ManufBlock1(0x6c)

0x006d = SBS:ManufBlock2(0x6d)

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RemainingCapacityAlarm (0x01)

0x006e = SBS:ManufBlock3(0x6e)

0x006f = SBS:ManufBlock4(0x6f)

0x0072 = SBS:TempRange(0x72)

A.2 RemainingCapacityAlarm (0x01)

This read- or write-word function sets or gets a low-capacity alarm threshold unsigned integer value with a range of 0 to 65,535 and units of either mAh (CapM = 0) or 10 mWh (CapM = 1). The default value for RemainingCapacityAlarm is stored in Rem Cap Alarm. If RemainingCapacityAlarm is set to 0, the alarm is disabled.

If RemainingCapacity < RemainingCapacityAlarm, the [RCA] flag is set and the bq20z60-R1/bq20z65-R1 sends an AlarmWarning message to the SMBUS host.

If RemainingCapacity ≥ RemainingCapacityAlarm and [DSG] is set, the [RCA] flag is cleared.

0 = Remaining capacity alarm is disabled

1..700 = Remaining capacity limit for [RCA] flag

Table A-7. RemainingCapacityAlarm

SBS Size in Min Max Default Cmd. Bytes Value Value Value

0x01 R/W RemainingCapacityAlarm Unsigned integer 2 0 700 300 mAh or 10 mWh

Mode Name Format Unit

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Related Variables:

• DF:SBS Configuration:Data(48):Rem Cap Alarm(0)

• SBS:BatteryMode(0x03)[CapM]

• SBS:RemainingCapacity(0x0f)

• SBS:BatteryStatus(0x16)[RCA],[DSG]

A.3 RemainingTimeAlarm (0x02)

This read- or write-word function sets or gets the RemainingTimeAlarm unsigned integer value in minutes with a range of 0 to 65,535. The default value of RemainingTimeAlarm is stored in Rem Time Alarm. If RemainingTimeAlarm = 0, this alarm is disabled.

If AverageTimeToEmpty < RemainingTimeAlarm, the [RTA] flag is set and the bq20z60-R1/bq20z65-R1 sends an AlarmWarning message to the SMBus host.

If AverageTimeToEmpty ≥ RemainingTimeAlarm, the [RTA] flag is reset.

0 = Remaining time alarm is disabled

1..30 = Remaining time limit for [RTA] flag

SBS Size in Min Max Default Cmd. Bytes Value Value Value

0x02 R/W RemainingTimeAlarm Unsigned integer 2 0 30 10 min

Mode Name Format Unit

Table A-8. RemainingTimeAlarm

Related Variables:

• DF:SBS Configuration:Data(48):Rem Time Alarm(4)

• SBS:AverageTimeToEmpty(0x12)

• SBS:BatteryStatus(0x16)[RTA]

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A.4 BatteryMode (0x03)

This read- or write-word function selects the various battery operational modes and reports the battery's capabilities and modes and flags minor conditions requiring attention.

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

High Byte CapM ChgM AM RSVD RSVD RSVD PB CC

Low Byte CF RSVD RSVD RSVD RSVD RSVD PBS ICC

LEGEND: High byte is read/write, low byte is read-only; RSVD = Reserved and must be programmed to 0

Figure A-2. BatteryMode

CapM— Sets the units used for capacity information and internal calculation.

0 = Reports in mA or mAh (default) 1 = Reports in 10 mW or 10 mWh

The following functions are instantaneously updated after a [CapM] change:

SBS:RemainingCapacityAlarm(0x01)

SBS:AtRate(0x04)

SBS:RemainingCapacity(0x0f)

SBS:FullChargeCapacity(0x10)

SBS:DesignCapacity(0x18)

The following functions are recalculated within 1 second after a [CapM] change:

SBS:RemainingTimeAlarm(0x02)

SBS:AtRateTimeToEmpty(0x06)

SBS:AtRateOK(0x07)

SBS:RunTimeToEmpty(0x11)

SBS:AverageTimeToEmpty(0x12)

SBS:BatteryStatus(0x16)

BatteryMode (0x03)

ChgM— Enables or disables the bq20z60-R1/bq20z65-R1 transmission of ChargingCurrent and

ChargingVoltage messages to the Smart Battery Charger.

0 = Enable ChargingVoltage and ChargingCurrent broadcasts to the Smart Battery Charger

by setting the [BCAST] bit in Operation Cfg B when charging is desired.

1 = Disable ChargingVoltage and ChargingCurrent broadcasts to the Smart Battery Charger.

(default)

Related Variables:

DF:Configuration:Registers(64):Operation Cfg B(2)[BCAST]

SBS:ChargingCurrent(0x14)

SBS:ChargingVoltage(0x15)

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AtRate (0x04)

AM— Enables or disables AlarmWarning broadcasts to the host and Smart Battery Charger

PB— Sets the role of the battery pack. This flag is not used by the bq20z60-R1/bq20z65-R1 and should

CC— Enable or disable internal charge controller. This flag is not used by bq20z60-R1/bq20z65-R1 and

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0 = Enable AlarmWarning broadcast to host and Smart Battery Charger by setting the

[BCAST] bit in Operation Cfg B (default). The bq20z60-R1/bq20z65-R1 sends the

AlarmWarning messages to the SMBus Host and the Smart Battery Charger any time an

alarm condition is detected.

1 = Disable AlarmWarning broadcast to host and Smart BatteryCharger. The

bq20z60-R1/bq20z65-R1 does not master the SMBus, and AlarmWarning messages are

not sent to the SMBus Host and the Smart Battery Charger for a period of no more than

65 seconds and no less than 45 seconds. [AM] is automatically cleared by the

bq20z60-R1/bq20z65-R1 60 seconds after being set to 1, independent of the [BCAST]

bit.

Related Variable:

DF:Configuration:Registers(64):Operation Cfg B(2)[BCAST]

NOTE: The system, as a minimum, is required to poll the Smart Battery Charger every 10

seconds if the [AM] flag is set.

be set to 0.

should be set to 0.

CF— This flag is set if MaxError > CF MaxError Limit

0 = Battery OK 1 = Condition cycle requested

PBS— Primary battery support is not supported by bq20z60-R1/bq20z65-R1 and is fixed to 0. ICC— This flag indicates whether the internal charge controller function is supported or not. This value is

fixed to 1.

A.5 AtRate (0x04)

This read- or write-word function is the first half of a two-function call set used to set the AtRate value, which is used in calculations made by the AtRateTimeToFull, AtRateTimeToEmpty, and AtRateOK functions. The AtRate units are in either mA ([CapM] = 0) or 10 mW ([CapM] = 1).

When the AtRate value is positive, the AtRateTimeToFull function returns the predicted time to full charge at the AtRate value of charge. When the AtRate value is negative, the AtRateTimeToEmpty function returns the predicted operating time at the AtRate value of discharge. When the AtRate value is negative, the AtRateOK function returns a Boolean value that predicts the battery's ability to supply the AtRate value of additional discharge energy (current or power) for 10 seconds.

The default value for AtRate is zero.

Related Variables:

DF:SBS Configuration:Data(48):CF MaxError Limit(21)

SBS:MaxError(0x0c)

Table A-9. AtRate

SBS Cmd.

0x04 R/W AtRate Signed integer 2 –32,768 32,767 0 mA or 10 mW

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Related Variables:

• SBS:AtRateTimeToFull(0x05)

• SBS:AtRateTimeToEmpty(0x06)

• SBS:AtRateOK(0x07)

• SBS:BatteryMode(0x03)[CapM]

A.6 AtRateTimeToFull (0x05)

This read-word function returns an unsigned integer value of the predicted remaining time to fully charge the battery using a CC-CV method at the AtRate value in minutes, with a range of 0 to 65,534. A value of 65,535 indicates that the AtRate = 0.

AtRateTimeToFull can report time based on constant current ([CapM] = 0) or constant power ([CapM] =

1), and updates within 1 second after the SMBus host sets the AtRate value. The bq20z60-R1/bq20z65-R1 automatically updates AtRateTimeToFull based on the AtRate function at 1-second intervals.

0..65,534 = predicted time to full charge, based on AtRate 65,535 = no charge or discharge (AtRate is 0)

SBS Size in Min Max Default Cmd. Bytes Value Value Value

0x05 R AtRateTimeToFull Unsigned integer 2 0 65,535 – min

Mode Name Format Unit

AtRateTimeToFull (0x05)

Table A-10. AtRateTimeToFull

Related Variables:

• SBS:AtRate(0x04)

• SBS:BatteryMode(0x03)[CapM]

A.7 AtRateTimeToEmpty (0x06)

This read-word function returns an unsigned integer value of the predicted remaining operating time in minutes with a range of 0 to 65,534, if the battery is discharged at the AtRate value. A value of 65,535 indicates that AtRate = 0.

AtRateTimeToEmpty can report time based on constant current ([LDMD] = 0), or constant power ([LDMD] = 1), and is updated within 1 second after the SMBus host sets the AtRate value. The bq20z60-R1/bq20z65-R1 updates AtRateTimeToEmpty at 1-second intervals.

0..65,534 = predicted remaining operating time, based on AtRate 65,535 = no charge or discharge (AtRate is 0)

SBS Size in Min Max Default Cmd. Bytes Value Value Value

0x06 R AtRateTimeToEmpty Unsigned integer 2 0 65,535 – min

Related Variables:

• SBS:AtRate(0x04)

• SBS:OperationStatus(0x54)[LDMD]

Mode Name Format Unit

Table A-11. AtRateTimeToEmpty

A.8 AtRateOK (0x07)

This read-word function returns a boolean value that indicates whether or not the battery can deliver the AtRate value of energy for 10 seconds.

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Temperature (0x08)

The bq20z60-R1/bq20z65-R1 updates this value within 1 second after the SMBus host sets the AtRate function value. The bq20z60-R1/bq20z65-R1 updates AtRateOK at 1-second intervals.

If AtRate function returns ≥0, AtRateOK always returns TRUE.

0 = FALSE bq20z60-R1/bq20z65-R1 cannot deliver energy for 10 seconds, based on

1..65,535 = TRUE bq20z60-R1/bq20z65-R1 cn deliver energy for 10 seconds, based on discharge

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x07 R AtRateOK Unsigned integer 2 0 65,535 – min

Related Variable:

• SBS:AtRate(0x04)

A.9 Temperature (0x08)

This read-word function returns an unsigned integer value of the temperature in units of 0.1 K, as measured by the bq20z60-R1/bq20z65-R1. It has a range of 0 to 6553.5 K.

The source of the measured temperature is configured by the [TEMP1], [TEMP0] bits in the Operation Cfg A register.

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discharge rate indicated in AtRate

rate indicated in AtRate

Table A-12. AtRateOK

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x08 R Temperature Unsigned integer 2 0 65,535 – 0.1 K

Related Variable:

• DF:Configuration:Register(64):Operation Cfg A(0)

A.10 Voltage (0x09)

This read-word function returns an unsigned integer value of the sum of the individual cell voltage measurements in mV, with a range of 0 to 20,000 mV.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x09 R Voltage Unsigned integer 2 0 20,000 – mV

A.11 Current (0x0a)

This read-word function returns an integer value of the measured current being supplied (or accepted) by the battery in mA, with a range of –32,768 to 32,767. A positive value indicates charge current and a negative value indicates discharge.

Any current value within Deadband is reported as 0 mA by the Current function.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x0a R Current Signed integer 2 –32,768 32,767 – mA

Table A-13. Temperature

Table A-14. Voltage

Table A-15. Current

Standard SBS Commands SLUU386–January 2010

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Related Variable:

• DF:Calibration:Current(107):Deadband(1)

NOTE: The Current function is the average of four internal current measurements over a 1-second

period.

A.12 AverageCurrent (0x0b)

This read-word function returns a signed integer value that approximates a one-minute rolling average of the current being supplied (or accepted) through the battery terminals in mA, with a range of –32,768 to 32,767.

AverageCurrent is calculated by a rolling IIR filtered average of Current function data with a period of

14.5 s. During the time after a reset and before 14.5 s has elapsed, the reported AverageCurrent = Current function value.

SBS Min Cmd. Value

0x0b R AverageCurrent Signed integer 2 –32,768 32,767 – mA

Related Variables:

• DF:Calibration:Current(107):Filter(0)

• SBS:Current(0x0a)

Mode Name Format Size in Bytes Max Value Default Value Unit

AverageCurrent (0x0b)

Table A-16. AverageCurrent

A.13 MaxError (0x0c)

This read-word function returns an unsigned integer value of the expected margin of error, in %, in the state-of-charge calculation, with a range of 1% to 100%.

Max error is incremented internally by 0.05% for every increment of CylceCount after the last QMAX update. MaxError is incremented in the display by 1% for each increment of CycleCount.

Event MaxError Setting

Full reset Set to 100% QMAX and Ra table update Set to 1% QMAX update Set to 3% Ra table update Set to 5%

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x0c R MaxError Unsigned integer 1 0 100 – %

Related Variable:

• SBS:CycleCount(0x17)

A.14 RelativeStateOfCharge (0x0d)

This read-word function returns an unsigned integer value of the predicted remaining battery capacity expressed as a percentage of FullChargeCapacity with a range of 0 to 100%, with fractions of % rounded up.

If the [RSOCL] bit in Operation Cfg C is set, then RelativeStateofCharge and RemainingCapacity are held at 99% until primary charge termination occurs and only displays 100% on entering primary charge termination.

Table A-17. MaxError

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AbsoluteStateOfCharge (0x0e)

If the [RSOCL] bit in Operation Cfg C is cleared, then RelativeStateofCharge and RemainingCapacity are

not held at 99% until primary charge termination occurs. Fractions of % greater than 99% are rounded up to display 100%.

SBS Size in Min Max Default Cmd. Bytes Value Value Value

0x0d R RelativeStateOfCharge Unsigned integer 1 0 100 – %

Mode Name Format Unit

Related Variables:

• DF:Configuration:Registers(64):Operation Cfg C(4)[RSOCL]

• SBS:FullChargeCapacity(0x10)

A.15 AbsoluteStateOfCharge (0x0e)

This read-word function returns an unsigned integer value of the predicted remaining battery capacity expressed in %, with a range of 0 to 100%, with any fractions of % rounded up. The following table shows the calculation used, depending on the setting of the [CapM] flag.

CapM AbsoluteStateOfCharge Calculation

0 = RemainingCapacity / Design Capacity 1 = RemainingCapacity / Design Energy

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Table A-18. RelativeStateOfCharge

NOTE: AbsoluteStateOfCharge can return values > 100%.

SBS Size in Min Max Default Cmd. Bytes Value Value Value

0x0e R AbsoluteStateOfCharge Unsigned integer 1 0 100+ – %

Mode Name Format Unit

Related Variables:

• DF:SBS Configuration:Data(48):Design Capacity(22)

• DF:SBS Configuration:Data(48):Design Energy(24)

• SBS:BatteryMode(0x03)[CapM]

• SBS:RemainingCapacity(0x0f)

A.16 RemainingCapacity (0x0f)

This read- or write-word function returns an unsigned integer value, with a range of 0 to 65,535, of the predicted charge or energy remaining in the battery. This value is expressed in either charge (mAh) or energy (10 mWh), depending on the setting of the [CapM] flag.

SBS Size in Min Max Default Cmd. Bytes Value Value Value

0x0f R/W RemainingCapacity Unsigned integer 2 0 65,535 – mAh or 10 mWh

Mode Name Format Unit

Table A-19. AbsoluteStateOfCharge

Table A-20. RemainingCapacity

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Related Variable:

• SBS:BatteryMode(0x03)[CapM]

A.17 FullChargeCapacity (0x10)

This read-word function returns an unsigned integer value of the predicted pack capacity when it is fully charged. This value is expressed in either charge (mAh) or power (10 mWh) depending on setting of [CapM] flag. The maximum charge capacity is limited to 32Ah.

SBS Min Max Default Cmd. Value Value Value

0x10 R FullChargeCapacity Unsigned integer 2 0 32,767 – mAh or 10 mWh

Mode Name Format in Unit

Related Variable:

• SBS:BatteryMode(0x03)[CapM]

A.18 RunTimeToEmpty (0x11)

This read-word function returns an unsigned integer value of the predicted remaining battery life at the present rate of discharge, in minutes, with a range of 0 to 65,534 minutes. A value of 65,535 indicates that the battery is not being discharged.

This value is calculated and updated based on current or power, depending on the setting of the [CapM] flag.

FullChargeCapacity (0x10)

Table A-21. FullChargeCapacity

Size Bytes

0..65,534 = Predicted remaining battery life, based on Current 65,535 = Battery is not being discharged

SBS Size in Min Max Default Cmd. Bytes Value Value Value

0x11 R RunTimeToEmpty Unsigned integer 2 0 65,534 – min

Mode Name Format Unit

Related Variable:

• SBS:BatteryMode(0x03)[CapM]

A.19 AverageTimeToEmpty (0x12)

This read-word function returns an unsigned integer value of the predicted remaining battery life, in minutes, based on AverageCurrent, with a range of 0 to 65,534. A value of 65,535 indicates that the battery is not being discharged.

This value is calculated based on current or power, depending on the setting of the [CapM] flag.

0..65,534 = Predicted remaining battery life, based on AverageCurrent 65,535 = Battery is not being discharged

SBS Min Cmd. Value

0x12 R AverageTimeToEmpty Unsigned integer 2 0 65,534 – min

Mode Name Format Size in Bytes Max Value Default Value Unit

Table A-22. RunTimeToEmpty

Table A-23. AverageTimeToEmpty

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AverageTimeToFull (0x13)

Related Variables:

• SBS:BatteryMode(0x03)[CapM]

• SBS:AverageCurrent(0x0b)

A.20 AverageTimeToFull (0x13)

This read-word function returns an unsigned integer value of predicted remaining time until the battery reaches full charge, in minutes, based on AverageCurrent, with a range of 0 to 65,534. A value of 65,535 indicates that the battery is not being charged.

0..65,534 = Predicted remaining time until full charge 65,535 = Battery is not being charged

SBS Cmd. Mode Name Format Size in Bytes Min Value Default Value Unit

0x13 R AverageTimeToFull Unsigned integer 2 0 65,534 – min

Related Variable:

• SBS:AverageCurrent(0x0b)

A.21 ChargingCurrent (0x14)

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Table A-24. AverageTimeToFull

Max Value

This read-word function returns an unsigned integer value of the desired charging current, in mA, with a range of 0 to 65,534. A value of 65,535 indicates that a charger should operate as a voltage source outside its maximum regulated current range.

0..65,534 = Desired charging current in mA 65,535 = Charger should operate as voltage source outside its maximum regulated current range.

Table A-25. ChargingCurrent

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x14 R ChargingCurrent Unsigned integer 2 0 65,534 – mA

A.22 ChargingVoltage (0x15)

This read-word function returns an unsigned integer value of the desired charging voltage, in mV, where the range is 0 to 65,534. A value of 65,535 indicates that the charger should operate as a current source outside its maximum regulated voltage range.

0..65,534 = Desired charging voltage in mV 65,535 = cCharger should operate as current source outside its maximum regulated voltage

range.

Table A-26. ChargingVoltage

SBS Cmd.

0x15 R ChargingVoltage Unsigned 2 0 65,534 – mV

Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

integer

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A.23 BatteryStatus (0x16)

This read-word function returns the status of the bq20z60-R1/bq20z65-R1-based battery.

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

High Byte OCA TCA RSVD OTA TDA RSVD RCA RTA

Low Byte INIT DSG FC FD EC3 EC2 EC1 EC0

LEGEND: All values read-only; RSVD = Reserved

OCA— 1 = Over Charged Alarm TCA— 1 = Terminate Charge Alarm OTA— 1 = Over Temperature Alarm TDA— 1 = Terminate Discharge Alarm RCA— Remaining Capacity Alarm

1 = Remaining Capacity Alarm is set

See: SBS:RemainingCapacityAlarm(0x01)

RTA— Remaining Time Alarm

BatteryStatus (0x16)

Figure A-3. BatteryStatus

1 = Remaining Time Alarm is set

See: SBS:RemainingTimeAlarm(0x02)

INIT— 1 = Initialization. The INIT flag is always set in normal operation. DSG— Discharging

0 = bq20z60-R1/bq20z65-R1 is in charging mode 1 = bq20z60-R1/bq20z65-R1 is in discharging mode or relaxation mode, or valid charge

termination has occurred. See: Gas Gauging, Section C.10

FC— 1 = Fully Charged FD— 1 = Fully Discharged EC3, EC2, EC1, EC0— Error Code, returns status of processed SBS function

0,0,0,0 = OK bq20z60-R1/bq20z65-R1 processed the function code with no errors

detected. 0,0,0,1 = BUSY bq20z60-R1/bq20z65-R1 is unable to process the function code at this time. 0,0,1,0 = Reserved bq20z60-R1/bq20z65-R1 detected an attempt to read or write to a function

code reserved by this version of the specification, or

bq20z60-R1/bq20z65-R1 detected an attempt to access an unsupported

optional manufacturer function code. 0,0,1,1 = Unsupported bq20z60-R1/bq20z65-R1 does not support this function code as defined in

this version of the specification. 0,1,0,0 = AccessDenied bq20z60-R1/bq20z65-R1 detected an attempt to write to a read-only function

code. 0,1,0,1 = Over/Underflow bq20z60-R1/bq20z65-R1 detected a data overflow or underflow.

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CycleCount (0x17)

0,1,1,0 = BadSize bq20z60-R1/bq20z65-R1 detected an attempt to write to a function code with

0,1,1,1 = UnknownError bq20z60-R1/bq20z65-R1 detected an unidentifiable error.

A.24 CycleCount (0x17)

This read-word function returns, as an unsigned integer value, the number of cycles the battery has experienced, with a range of 0 to 65,535. The default value is stored in the data flash value Cycle Count, which is updated each time this variable is incremented. One cycle count is the accumulated discharge of CC Threshold.

When the bq20z60-R1/bq20z65-R1 is in unsealed or full-access mode, this block is R/W.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x17 R/W CycleCount Unsigned integer 2 0 65,535 0 –

Related Variables:

• DF:SBS Configuration:Data(48)Cycle Count(16)

• DF:SBS Configuration:Data(48)CC Threshold(18)

A.25 DesignCapacity (0x18)

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an incorrect data block.

Table A-27. CycleCount

This read-word function returns, as an unsigned integer value, the theoretical or nominal capacity of a new pack, stored in Design Capacity or in Design Energy.

The DesignCapacity value is expressed in either current (mAh at a C/5 discharge rate) or power, (10 mWh at a P/5 discharge rate) depending on the setting of the [CapM] bit.

When the bq20z60-R1/bq20z65-R1 is in unsealed or full-access mode, this block is R/W. The maximum capacity is 32Ah.

SBS Size in Min Max Default Cmd. Bytes Value Value Value

0x18 R/W DesignCapacity

Mode Name CapM Format Unit

Related Variables:

• DF:SBS Configuration:Data(48):Design Capacity(22)

• DF:SBS Configuration:Data(48):Design Energy(24)

• SBS:BatteryMode(0x03)[CapM]

• SBS:OperationStatus(0x54)[SS],[FAS]

A.26 DesignVoltage (0x19)

This read-word function returns an unsigned integer value of the theoretical voltage of a new pack, in mV, with a range of 0 to 65,535. The default value is stored in Design Voltage.

When the bq20z60-R1/bq20z65-R1 is in unsealed or full-access mode, this block is R/W.

Table A-28. DesignCapacity

0 Unsigned 2 0 32,767 4400 mAh

integer

1 Unsigned 2 0 32,767 6336 10 mWh

integer

Table A-29. DesignVoltage

SBS Mode Name Format Size in Bytes Min Value Max Value Default Unit Cmd. Value

0x19 R/W DesignVoltage Unsigned 2 7000 18,000 14,400 mV

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integer

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SpecificationInfo (0x1a)

Related Variables:

• DF:SBS Configuration:Data(48):Design Voltage(8)

• SBS:OperationStatus(0x54)[SS],[FAS]

A.27 SpecificationInfo (0x1a)

This read-word function returns, as an unsigned integer value, the version number of the Smart Battery Specification the battery pack supports, as well as voltage- and current-scaling information.

Power-scaling is the product of the voltage-scaling times the current-scaling. The data is packed in the following fashion:

IPScale × 0x1000 + VScale x 0x0100 + SpecID_H × 0x0010 + SpecID_L

VScale (voltage scaling) and IPScale (current scaling) should always be set to zero. The default setting is stored in Spec Info.

When the bq20z60-R1/bq20z65-R1 is in unsealed or full-access mode, this block is R/W.

Table A-30. SpecificationInfo

SBS Cmd.

0x1a R/W SpecificationInfo Hex 2 0x0000 0xffff 0x0031 –

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

IPScale (0) VScale (0) SpecID_H SpecID_L

(multiplies (multiplies (0..15) (0..15) current by voltage by

IPScale

LEGEND: R/W = Read/write; R = Read-only; - n = value after reset

Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

) 10

VScale

)

Figure A-4. SpecificationInfo

Related Variables:

• DF:SBS Configuration:Data(48):Spec Info(10)

• SBS:OperationStatus(0x54)[SS],[FAS]

A.28 ManufactureDate (0x1b)

This read-word function returns the date the pack was manufactured in a packed integer. The date is packed in the following fashion:

(Year – 1980) × 512 + month × 32 + day The default value for this function is stored in Manuf Date. When the bq20z60-R1/bq20z65-R1 is in unsealed or full-access mode, this block is R/W.

Table A-31. ManufactureDate

SBS Cmd.

0x1b R/W ManufacturerDate Unsigned integer 2 0 65,535 0 –

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Year Month Date

biased (1..12) (0..31) by 1980 (0..127)

MSB LSB MSB LSB MSB LSB

Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

Figure A-5. ManufacturerDate

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SerialNumber (0x1c)

Related Variables:

• DF:SBS Configuration:Data(48):Manuf Date(12)

• SBS:OperationStatus(0x54)[SS],[FAS]

A.29 SerialNumber (0x1c)

This read-word function is used to return an unsigned integer serial number. The default value of this function is stored in Ser. Num..

When the bq20z60-R1/bq20z65-R1 is in unsealed or full-access mode, this block is R/W.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x1c R/W SerialNumber Hex 2 0x0000 0xffff 0x0001 –

Related Variables:

• DF:SBS Configuration:Data(48):Ser. Num.(14)

• SBS:OperationStatus(0x54)[SS],[FAS]

A.30 ManufacturerName (0x20)

This read-block function returns a character string containing the battery manufacturer's name with a maximum length of 20 characters (20 data + length byte).

The default setting of this function is stored in data flash Manuf Name. When the bq20z60-R1/bq20z65-R1 is in unsealed or full-access mode, this block is R/W.

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Table A-32. SerialNumber

SBS Cmd.

0x20 R/W ManufacturerName String 20 + 1 – – Texas –

Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

Related Variables:

• DF:SBS Configuration:Data(48):Manuf Name(26)

• SBS:OperationStatus(0x54)[SS],[FAS]

A.31 DeviceName (0x21)

This read-block function returns a character string that contains the battery name with a maximum length of 20 characters (20 data + length byte).

The default setting of this function is stored in data flash Device Name. When the bq20z60-R1/bq20z65-R1 is in unsealed or full-access mode, this block is R/W.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x21 R/W DeviceName String 20 + 1 – – bq20z60 or –

Table A-33. ManufacturerName

Instruments

Table A-34. DeviceName

bq20z65

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Related Variables:

• DF:SBS Configuration:Data(48):Device Name(38)

• SBS:OperationStatus(0x54)[SS],[FAS]

A.32 DeviceChemistry (0x22)

This read-block function returns a character string that contains the battery chemistry with a maximum length of 4 characters (4 data + length byte).

The default setting of this function is stored in data flash Device Chemistry, although it has no use for internal charge control or fuel gauging.

When the bq20z60-R1/bq20z65-R1 is in unsealed or full-access mode, this block is R/W.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x22 R/W DeviceChemistry String 4 + 1 – – LION –

Related Variables:

• DF:SBS Configuration:Data(48):Device Chemistry(46)

• SBS:OperationStatus(0x54)[SS],[FAS]

A.33 ManufacturerData (0x23)

DeviceChemistry (0x22)

Table A-35. DeviceChemistry

This read-block function returns several configuration data flash elements with an absolute maximum length of 14 data + 1 length byte (stored in ManufacturerData Length). The ManufacturerData elements shown in Table A-36 are stored in the ManufacturerData subclass.

When the bq20z60-R1/bq20z65-R1 is in Unsealed or full-access mode, this block is R/W.

Table A-36. ManufacturerData

Data Byte Name Format

Manufacturer Data 0 Pack Lot Code Hex

1 2 PCB Lot Code 3 4 Firmware Version 5 6 Hardware Revision 7 8 Cell Revision 9

bq20z60-R1/bq20z65- 10 Partial Reset Counter R1 Counter

11 Full Reset Counter 12 Watchdog Reset Counter 13 Check Sum 14 String Length Byte

Related Variables:

• DF:System Data:Manufacturer Data(56):Pack Lot Code(0)

• DF:System Data:Manufacturer Data(56):PCB Lot Code(2)

• DF:System Data:Manufacturer Data(56):Firmware Version(4)

• DF:System Data:Manufacturer Data(56):Hardware Revision(6)

• DF:System Data:Manufacturer Data(56):Cell Revision(8)

• SBS:OperationStatus(0x54)[SS],[FAS]

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Authenticate (0x2f)

A.34 Authenticate (0x2f)

This read- or write-block function allows the host to authenticate a bq20z60-R1/bq20z65-R1-based battery using an SHA-1 authentication transform with a length of 20 data bytes + 1 length byte. See the Using SHA-1 in bq20zxx Family of Gas Gauges application report (SLUA359) for detailed information.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x2f R/W Authenticate String 20 + 1 – – – –

A.35 CellVoltage4..1 (0x3c..0x3f)

These read-word functions return an unsigned value of the calculated individual cell voltages, in mV, with a range of 0 to 65,535. CellVoltage1 corresponds to the bottommost series cell element, whereas CellVoltage4 corresponds to the topmost series cell element.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x3c R CellVoltage4 Unsigned 2 0 65,535 – mV 0x3d CellVoltage3 – 0x3e CellVoltage2 – 0x3f CellVoltage1 –

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Table A-37. Authenticate

Table A-38. CellVoltage4..1

integer

A.36 SBS Command Values

SBS Size in Min Max Cmd Bytes Value Value

0x00 R/W ManufacturerAccess Hex 2 0x0000 0xffff – – 0x01 R/W RemainingCapacityAlarm Integer 2 0 700 or 300 or 432 mAh or 10

0x02 R/W RemainingTimeAlarm Unsigned 2 0 30 10 min

0x03 R/W BatteryMode Hex 2 0x0000 0xffff – – 0x04 R/W AtRate Integer 2 –32,768 32,767 0 mA or 10

0x05 R AtRateTimeToFull Unsigned 2 0 65,535 – min

0x06 R AtRateTimeToEmpty Unsigned 2 0 65,535 – min

0x07 R AtRateOK Unsigned 2 0 65,535 – –

0x08 R Temperature Unsigned 2 0 65,535 – 0.1 K

0x09 R Voltage Unsigned 2 0 20,000 – mV

0x0a R Current Integer 2 –32,768 32,767 – mA 0x0b R AverageCurrent Integer 2 –32,768 32,767 – mA 0x0c R MaxError Unsigned 1 0 100 – %

0x0d R RelativeStateOfCharge Unsigned 1 0 100 – %

0x0e R AbsoluteStateOfCharge Unsigned 1 0 100+ – %

Mode Name Format Default Value Unit

Table A-39. SBS COMMANDS

1000 mWh

integer

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SBS Command Values

Table A-39. SBS COMMANDS (continued)

SBS Size in Min Max Cmd Bytes Value Value

0x0f R/W RemainingCapacity Unsigned 2 0 65,535 – mAh or 10

0x10 R FullChargeCapacity Unsigned 2 0 32,767 – mAh or 10

0x11 R RunTimeToEmpty Unsigned 2 0 65,534 – min

0x12 R AverageTimeToEmpty Unsigned 2 0 65,534 – min

0x13 R AverageTimeToFull Unsigned 2 0 65,534 – min

0x14 R ChargingCurrent Unsigned 2 0 65,534 – mA

0x15 R ChargingVoltage Unsigned 2 0 65,534 – mV

0x16 R BatteryStatus Hex 2 0x0000 0xdbff – – 0x17 R/W CycleCount Unsigned 2 0 65,535 0 –

0x18 R/W DesignCapacity Integer 2 0 32,767 4400 or 6336 mAh or 10

0x19 R/W DesignVoltage Integer 2 7000 18,000 14,400 mV 0x1a R/W SpecificationInfo Hex 2 0x0000 0xffff 0x0031 – 0x1b R/W ManufactureDate Unsigned 2 – 65,535 0 –

0x1c R/W SerialNumber Hex 2 0x0000 0xffff 0 – 0x20 R/W ManufacturerName String 20 + 1 – – Texas –

0x21 R/W DeviceName String 20 + 1 – – bq20z60 or –

0x22 R/W DeviceChemistry String 4 + 1 – – LION – 0x23 R/W ManufacturerData String 14 + 1 – – – – 0x2f R/W Authenticate String 20 + 1 – – – – 0x3c R CellVoltage4 Unsigned 2 0 65,535 – mV

0x3d R CellVoltage3 Unsigned 2 0 65,535 – mV

0x3e R CellVoltage2 Unsigned 2 0 65,535 – mV

0x3f R CellVoltage1 Unsigned 2 0 65,535 – mV

Mode Name Format Default Value Unit

integer mWh

integer

mWh

integer

Instruments

bq20z65

integer

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The extended SBS commands are only available when the bq20z60-R1/bq20z65-R1 device is in unsealed or full access mode, unless otherwise noted.

Related Variables:

• SBS:ManufacturerAccess(0x00):Seal Access(0x0020)

• SBS:OperationStatus(0x54)[SS],[FAS]

• SBS:UnSealKey(0x60)

• SBS:FullAccessKey(0x61)

B.1 AFEData (0x45)

This read-block function returns a string of 11 data bytes + 1 length byte. The first 9 bytes are the AFE memory map followed by 2 bytes of the internal bq20z60-R1/bq20z65-R1 AFE_Fail_Counter.

Data Byte Name Format

AFE 0 AFE Status Hex

1 AFE Output 2 AFE State 3 AFE Function 4 AFE Cell Select 5 AFE OLV 6 AFE OLT 7 AFE SCC 8 AFE SCD

bq20z60- 9 Internal AFE_Fail_Counter high byte R1/bq20z65R1

10 Internal AFE_Fail_Counter low byte 11 String Length Byte

Appendix B

SLUU386–January 2010

Extended SBS Commands

Table B-1. AFEData

Related Variables:

• DF:2nd Level Safety:AFE Verification(20):AFE Fail Limit(1)

• DF:PF Status:AFE Regs(97)

B.2 FETControl (0x46)

This read- or write-word function allows direct control of the FETs for test purposes.

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

FETControl RSVD RSVD RSVD OD ZVCHG CHG DSG RSVD

LEGEND: RSVD = Reserved and must be programmed to 0

Figure B-1. FETControl

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StateOfHealth (0x4f)

OD— AFE GPOD pin control

ZVCHG— Zero-volt (pre-charge) charge FET control

CHG— Charge FET Control

DSG— Discharge FET Control

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0 = Disable GPOD pin (high-Z) 1 = Enable GPOD pin (open drain)

0 = Turn OFF pre-charge FET 1 = Turn ON pre-charge FET

0 = Turn OFF CHG FET. CHG FET does not turn off in discharge mode to protect the FET

body diode.

1 = Turn ON CHG FET

0 = Turn OFF DSG FET. DSG FET does not turn off in charge mode to protect the FET body

diode.

1 = Turn ON DSG FET

B.3 StateOfHealth (0x4f)

This read word function returns the state of health of the battery in % as well as information about the cell deterioration. The calculation formula depends on the [CapM] flag.

CapM StateOfHealth

0 = FullChargeCapacity / Design Capacity 1 = FullChargeCapacity / Design Energy

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

High Byte RSVD RSVD RSVD RSVD RSVD CLL DetF DetW

Low Byte State of Health %

LEGEND: All values read-only; RSVD = Reserved

CLL— (Cell Life Limit) 1 = Capacity of the pack fallen below Cell Life Limit threshold DetW— (Deterioration Warning) 1 = Capacity of the pack fallen below Deterioration Warn Limit

threshold

DetF— (Deterioration Fault) 1 = Capacity of the pack fallen below Deterioration Fault Limit threshold Related Variables:

• DF:SBS Configuration:Data(48):Design Capacity(22)

• DF:SBS Configuration:Data(48):Design Energy(24)

• DF: SBS Configuration:Data(48):Deterioration Warn Limit(73)

• DF: SBS Configuration:Data(48):Deterioration Fault Limit(74)

• DF: SBS Configuration:Data(48):Cell Life Limit(75)

• SBS:FullChargeCapacity(0x10)

• SBS:BatteryMode(0x03)[CapM]

Figure B-2. Operation Status

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B.4 SafetyAlert (0x50)

This read-word function returns indications of pending safety issues, such as running safety timers, or fail counters that are nonzero but have not reached the required time or value to trigger a SafetyStatus failure.

See 1st Level Protection Features, Section 2.2, for further details.

Related Variable:

• SBS:SafetyStatus(0x51)

High Byte OT1D OT1C OCD OCC OCD2 OCC2 RSVD RSVD

Low Byte CUV COV PF HWDG WDF AOCD SCC SCD

LEGEND: All values read-only

OT1D— 1 = Discharge overtemperature on TS1 alert OT1C— 1 = Charge overtemperature on TS1 alert OCD— 1 = Discharge overcurrent alert OCC— 1 = Charge overcurrent alert OCD2— 1 = Tier-2 discharge overcurrent alert OCC2— 1 = Tier-2 charge overcurrent alert

SafetyAlert (0x50)

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Figure B-3. SafetyAlert

CUV— 1 = Cell undervoltage alert PF— 1 = Permanent failure alert COV— 1 = Cell overvoltage alert HWDG— 1 = Host watchdog alert WDF— 1 = AFE watchdog alert AOCD— 1 = AFE discharge overcurrent alert SCC— 1 = Charge short-circuit alert SCD— 1 = Discharge short-circuit alert

B.5 SafetyStatus (0x51)

This read word function returns the status of the 1st level safety features. See 1st Level Protection Features, Section 2.2, for further details.

Related Variables:

• SBS:SafetyAlert(0x50)

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

High Byte OT1D OT1C OCD OCC OCD2 OCC2 RSVD RSVD

Low Byte CUV COV PF HWDG WDF AOCD SCC SCD

LEGEND: All values read-only; RSVD = Reserved

Figure B-4. SafetyStatus

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PFAlert (0x52)

OT1D— 1 = Discharge overtemperature on TS1 condition OT1C— 1 = Charge overtemperature on TS1 condition OCD— 1 = Discharge overcurrent condition OCC— 1 = Charge overcurrent condition OCD2— 1 = Tier-2 discharge overcurrent condition OCC2— 1 = Tier-2 charge overcurrent condition CUV— 1 = Cell undervoltage condition COV— 1 = Cell overvoltage condition PF— 1 = Permanent failure condition. HWDG— 1 = Host watchdog condition WDF— 1 = AFE watchdog condition AOCD— 1 = AFE discharge overcurrent condition SCC— 1 = Charge short-circuit condition SCD— 1 = Discharge short-circuit condition

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B.6 PFAlert (0x52)

This read-word function returns indications of pending safety issues, such as running safety timers that have not reached the required time to trigger a PFAlert failure.

See 2nd Level Protection Features, Section 2.3, for further details.

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

High Byte FBF RSVD SUV SOPT1 SOCD SOCC AFE_P ACE_C

Low Byte DFF DFETF CFETF CIM_R SOT1D SOT1C SOV PFIN

LEGEND: All values read-only; RSVD = Reserved

FBF— 1 = Fuse Blow Failure alert SUV— 1 = Safety Undervoltage permanent failure alert SOPT1— 1 = Open Thermistor, TS1, permanent failure alert SOCD— 1 = Discharge Safety Overcurrent permanent failure alert SOCC— 1 = Charge Safety-Overcurrent permanent failure alert AFE_P— 1 = Periodic AFE Communications permanent failure alert AFE_C— 1 = Permanent AFE Communications failure alert DFF— 1 = Data Flash Fault permanent failure alert

Figure B-5. PFAlert

DFETF— 1 = Discharge-FET-Failure permanent failure alert CFETF— 1 = Charge-FET-Failure permanent failure alert CIM_R— 1 = Cell-Imbalance (At Rest method) permanent failure alert SOT1D— 1 = Discharge Safety Overtemperature on TS1 permanent failure alert SOT1C— 1 = Charge Safety Overtemperature on TS1 permanent failure alert

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SOV— 1 = Safety-Overvoltage permanent failure alert PFIN— 1 = External Input Indication of permanent failure alert Related Variables:

• DF:Configuration:Registers(64):Permanent Fail Cfg(6)

• SBS:PFAlert2(0x6a)

• SBS:PFStatus(0x53)

• SBS:PFStatus2(0x6b)

B.7 PFStatus (0x53)

The permanent failure status register indicates the source of the bq20z60-R1/bq20z65-R1 permanent-failure condition.

Any new permanent failure is added to Saved PF Flags 1..2 register to show all permanent failures that have occurred.

See 2nd Level Protection Features, Section 2.3, for further details.

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

High Byte FBF RSVD SUV SOPT1 SOCD SOCC AFE_P AFE_C

Low Byte DFF DFETF CFETF CIM_R SOT1D SOT1C SOV PFIN

LEGEND: All values read-only; RSVD = Reserved

PFStatus (0x53)

Figure B-6. PFStatus

FBF— 1 = Fuse Blow Failure SUV— 1 = Safety Undervoltage permanent failure SOPT1— 1 = Open Thermistor on TS1 permanent failure SOCD— 1 = Discharge Safety Overcurrent permanent failure SOCC— 1 = Charge Safety-Overcurrent permanent failure AFE_P— 1 = Periodic AFE Communications permanent failure AFE_C— 1 = Permanent AFE Communications failure DFF— 1 = Data Flash Fault permanent failure DFETF— 1 = Discharge-FET-Failure permanent failure CFETF— 1 = Charge-FET-Failure permanent failure CIM_R— 1 = Cell-Imbalance (At Rest method) permanent failure SOT1D— 1 = Discharge Safety Overtemperature on TS1 permanent failure SOT1C— 1 = Charge Safety Overtemperature on TS1 permanent failure SOV— 1 = Safety-Overvoltage permanent failure PFIN— 1 = External Input Indication of permanent failure Related Variables:

• DF:Configuration:Registers(64):Permanent Fail Cfg 1(6),Permanent Fail Cfg 2(8)

• DF:PF Status:Device Status Data(96):Saved PF Flags 1(0),Saved PF Flags 2(2)

• DF:PF Status:Device Status Data(96):Saved 1st PF Flag 1(32), Saved 1st PF Flag 2(34)

• SBS:PFAlert(0x52)

• SBS:PFAlert2(0x6a)

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OperationStatus (0x54)

• SBS:PFStatus2(0x6b)

B.8 OperationStatus (0x54)

This read-word function returns the current operation status of the bq20z60-R1/bq20z65-R1.

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

High Byte PRES FAS SS CSV RSVD LDMD RSVD RSVD

Low Byte WAKE DSG XDSG XDSGI DSGIN R_DIS VOK QEN

LEGEND: All values read-only; RSVD = Reserved

PRES— 1 = PRES is low, indicating that the system is present (battery inserted). FAS— 0 = Full access security mode SS— 1 = Sealed security mode CSV— 1 = Data flash checksum value has been generated LDMD— Load mode for Impedance Track modeling. 0 = constant current, 1 = constant power WAKE— 1 = bq20z60-R1/bq20z65-R1 WAKE mode DSG— Replica of the SBS:BatteryStatus(0x16)[DSG] flag.

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Figure B-7. OperationStatus

XDSG— 1 = Discharge fault XDSGI— 1 = Discharge disabled due to a current issue DSGIN— 1 = Discharge inhibited due to a high temperature issue R_DIS— 1 = Ra Table resistance updates are disabled VOK— 1 = Voltages are OK for a QMAX update QEN— 1 = QMAX updates are enabled

B.9 ChargingStatus (0x55)

This read-word function returns the current status of the charging functions.

High Byte XCHG CHSUSP PCHG MCHG LTCHG ST1CHG ST2CHG HTCHG

Low Byte RSVD CB PCMTO CMTO OCHGV OCHGI OC XCHGLV

LEGEND: All values read-only

XCHG— 1 = Charging disabled CHGSUSP— 1 = Charging suspended PCHG— 1 = Precharging

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Figure B-8. ChargingStatus

MCHG— 1 = Maintenance charging LTCHG— 1 = Low temperature charging ST1CHG— 1 = Standard temperature charging 1 ST2CHG— 1 = Standard temperature charging 2 HTCHG— 1 = High temperature charging

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CB— 1 = Cell balancing in progress PCMTO— 1 = Precharge timeout fault CMTO— 1 = Charge timeout fault OCHGV— 1 = Overcharge voltage fault OCHGI— 1 = Overcharge current fault OC— 1 = Overcharge fault XCHGLV— 1 = Battery is depleted

B.10 ResetData (0x57)

This read-word function returns the number of partial resets (low byte) and full resets (high byte) the device has experienced.

SBS Size in Min Max Default

Mode Name Byte Contents Format Unit

Cmd. Bytes Value Value Value

0x57 R ResetData Low byte Partial resets Unsigned integer 1 0 255 – –

ResetData (0x57)

Table B-2. ResetData

High byte Full resets Unsigned integer 1 0 255 – –

B.11 WDResetData (0x58)

This read-word function returns the number of watchdog resets the device has experienced.

SBS Size in Min Max Default Cmd. Bytes Value Value Value

0x58 R WDResetData Unsigned integer 2 0 65,53 – –

Mode Name Format Unit

B.12 PackVoltage (0x5a)

This read-word function returns an unsigned integer value representing the measured voltage from the AFE PACK pin, in mV, with a range of 0 to 65,535.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x5a R PackVoltage Unsigned integer 2 0 65,535 – mV

B.13 AverageVoltage (0x5d)

This read-word function returns an unsigned integer value that approximates a one-minute rolling average of the sum of the cell voltages in mV, with a range of 0 to 65,535.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x5d R AverageVoltage Unsigned integer 2 0 65,535 – mV

Table B-3. WDResetData

Table B-4. PackVoltage

Table B-5. AverageVoltage

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TS1Temperature (0x5e)

Related Variable:

• SBS:Voltage(0x09)

B.14 TS1Temperature (0x5e)

This read-block function returns the TS1 temperature reading. In addition to being accessible in full-access and unsealed modes, this command is also accessible in sealed mode.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x5e R TS1Temperature Integer 2 –400 1200 – 0.1°C

B.15 TS2Temperature (0x5f)

This read-block function returns the TS2 temperature reading. In addition to being accessible in full-access and unsealed modes, this command is also accessible in sealed mode.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x5f R TS2Temperature Integer 2 –400 1200 – 0.1°C

B.16 UnSealKey (0x60)

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Table B-6. TS1Temperature

Table B-7. TS2Temperature

This read- or write-block command allows the user to change the unseal key for the sealed-to-unsealed security-state transition. This function is only available when the bq20z60-R1/bq20z65-R1 is in the Full Access mode, indicated by a cleared [FAS] flag.

The order of the bytes, when entered in ManufacturerAccess, is the reverse of what is written to or read from the part. For example, if the first and second words of the UnSealKey block read returns 0x1234 and 0x5678, then in ManufacturerAccess, 0x3412 and 0x7856 should be entered to unseal the part.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x60 R/W UnSealKey Hex 4 0x0000 0000 0xffff ffff – –

Related Variable:

• SBS:OperationStatus(0x54)[FAS]

B.17 FullAccessKey (0x61)

This read- or write-block command allows the user to change the full-access security key for the unsealed-to-full access security-state transition. This function is only available when the bq20z60-R1/bq20z65-R1 is in the Full Access mode, indicated by a cleared [FAS] flag.

The order of the bytes, when entered in ManufacturerAccess, is the reverse of what is written to or read from the part. For example, if the first and second words of the FullAccessKey block-read return 0x1234 and 0x5678, then in ManufacturerAccess, 0x3412 and 0x7856 should be entered to put the part in full access mode.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x61 R/W FullAccessKey Hex 4 0x0000 0000 0xffff ffff – –

Table B-8. UnSealKey

Table B-9. FullAccessKey

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Related Variable:

• SBS:OperationStatus(0x54)[FAS]

B.18 PFKey (0x62)

This read- or write-block command allows the user to change the Permanent Failure Clear key. This function is only available when the bq20z60-R1/bq20z65-R1 is in the full-access mode, indicated by a cleared [FAS] flag.

The order of the bytes, when entered in ManufacturerAccess, is the reverse of what is written to or read from the part. For example, if the first and second words of the PFKey block-read return 0x1234 and 0x5678, then in ManufacturerAccess, 0x3412 and 0x7856 should be entered to clear a permanent failure.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x62 R/W PFKey Hex 4 0x0000 0000 0xffff ffff – –

Related Variable:

• SBS:OperationStatus(0x54)[FAS]

B.19 AuthenKey3 (0x63)

This read- or write-block command stores byte 12 to byte 15 of the 16-byte-long authentication key. This function is only available when the bq20z60-R1/bq20z65-R1 is in the full-access mode, indicated by a cleared [FAS] flag.

PFKey (0x62)

Table B-10. PFKey

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x63 R/W AuthenKey3 Hex 4 0x0000 0000 0xffff ffff 0x1032 5476 –

Related Variables:

• SBS:AuthenKey2(0x64)

• SBS:AuthenKey1(0x65)

• SBS:AuthenKey0(0x66)

B.20 AuthenKey2 (0x64)

This read- or write-block command stores byte 8 to byte 11 of the 16-byte-long authentication key. This function is only available when the bq20z60-R1/bq20z65-R1 is in the full-access mode, indicated by a cleared [FAS] flag.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x64 R/W AuthenKey2 Hex 4 0x00000000 0xffff ffff 0x98ab dcfe –

Related Variables:

• SBS:AuthenKey3(0x63)

• SBS:AuthenKey1(0x65)

• SBS:AuthenKey0(0x66)

Table B-11. AuthenKey3

Table B-12. AuthenKey2

B.21 AuthenKey1 (0x65)

This read- or write-block command stores byte 4 to byte 7of the 16-byte-long authentication key. This function is only available when the bq20z60-R1/bq20z65-R1 is in the full-access mode, indicated by a cleared [FAS] flag.

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AuthenKey0 (0x66)

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x65 R/W AuthenKey1 Hex 4 0x00000000 0xffff ffff 0xdfce ab89 –

Related Variables:

• SBS:AuthenKey3(0x63)

• SBS:AuthenKey2(0x64)

• SBS:AuthenKey0(0x66)

B.22 AuthenKey0 (0x66)

This read- or write-block command stores byte 0 to byte 3 of the 16-byte-long authentication key. This function is only available when the bq20z60-R1/bq20z65-R1 is in the full-access mode, indicated by a cleared [FAS] flag.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x66 R/W AuthenKey0 Hex 4 0x00000000 0xffff ffff 0x6745 2301 –

Related Variables:

• SBS:AuthenKey3(0x63)

• SBS:AuthenKey2(0x64)

• SBS:AuthenKey1(0x65)

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Table B-13. AuthenKey1

Table B-14. AuthenKey0

B.23 SafetyAlert2 (0x68)

See 1st Level Protection Features, Section 2.2, for further details.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x68 R SafetyAlert2 Hex 2 0x0000 0x0003 – –

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

High Byte RSVD RSVD RSVD RSVD RSVD RSVD RSVD RSVD

Low Byte RSVD RSVD RSVD RSVD RSVD RSVD OT2D OT2C

LEGEND: All values read-only. RSVD = Reserved

OT2D— 1 = Discharge overtemperature alert on TS2 OT2C— 1 = Charge overtermperature alert on TS2 Related Variables:

• SBS:SafetyStatus2(0x69)

B.24 SafetyStatus2 (0x69)

Table B-15. SafetyAlert2

Figure B-9. SafetyAlert2

This read-word function returns indications of pending safety issues that have not reached the required time or value to trigger a SafetyStatus failure.

See 1st Level Protection Features, Section 2.2, for further details.

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SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x69 R SafetyStatus2 Hex 2 0x0000 0x0003 – –

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

High Byte RSVD RSVD RSVD RSVD RSVD RSVD RSVD RSVD

Low Byte RSVD RSVD RSVD RSVD RSVD RSVD OT2D OT2C

LEGEND: All values read-only. RSVD = Reserved

OT2D— 1 = Discharge overtemperature condition on TS2 OT2C— 1 = Charge overtermperature condition on TS2 Related Variables:

• SBS:SafetyAlert2(0x68)

B.25 PFAlert2 (0x6a)

This read-word function returns indications of pending safety issues that have not reached the required time or value to trigger a permanent failure.

See 2nd Level Protection Features, Section 2.3, for further details.

PFAlert2 (0x6a)

Table B-16. SafetyStatus2

Figure B-10. SafetyStatus2

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

High Byte RSVD RSVD RSVD RSVD RSVD RSVD RSVD RSVD

Low Byte RSVD RSVD RSVD RSVD SOPT2 SOT2D SOT2C CIM_A

LEGEND: All values read-only. RSVD = Reserved

CIM_A— 1 = Cell-Imbalance (Active method) permanent failur alert SOT2D— 1 = Discharge Safety Overtemperature on TS2 permanent failure alert SOT2C— 1 = Charge Safety Overtemperature in TS2 permanent failure alert SOPT2— 1 = Open Thermistor on TS2 permanent failure alert Related Variables:

• DF:Configuration:Registers(64):Permanent Fail Cfg(6)

• SBS:PFAlert(0x52)

• SBS:PFStatus2(0x6b)

B.26 PFStatus2 (0x6b)

The permanent failure status register indicates the source of the bq20z60-R1/bq20z65-R1 permanent failure condition.

Any new permanent failure is added to Saved PF Flags register to show all permanent failures that have occurred.

See 2nd Level Protection Features, Section 2.3, for further details.

Figure B-11. PFAlert2

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

High Byte RSVD RSVD RSVD RSVD RSVD RSVD RSVD RSVD

Low Byte RSVD RSVD RSVD RSVD SOPT2 SOT2D SOT2C CIM_A

LEGEND: All values read-only. RSVD = Reserved

Figure B-12. PFStatus2

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ManufBlock1..4 (0x6c..0x6f)

CIM_A— 1 = Cell-Imbalance (Active method) permanent failure SOT2D— 1 = Discharge Safety Overtemperature on TS2 permanent failure SOT2C— 1 = Charge Safety Overtemperature in TS2 permanent failure SOPT2— 1 = Open Thermistor on TS2 permanent failure

Related Variables:

• DF:Configuration:Registers(64):Permanent Fail Cfg(6)

• DF:PF Status:Device Status Data(96):Saved PF Flags2(2)

• DF:PF Status:Device Status Data(96): Saved 1st PF Flag 2(34)

• SBS:PFAlert(0x52)

• SBS:PFStatus(0x53)

• SBS:PFAlert2(0x6a)

B.27 ManufBlock1..4 (0x6c..0x6f)

These read/write commands are used to access four 20-byte locations, ManufBlock1..4 that contain manufacturer data. These commands are available in sealed and unsealed modes. See the bq20z60-R1/bq20z65-R1 data sheet (SLUS877, SLUS878) for allowable number of write cycles.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x6c R/W ManufBlock1 String 20 – – – – 0x6d R/W ManufBlock2 String 20 – – – – 0x6e R/W ManufBlock3 String 20 – – – – 0x6f R/W ManufBlock4 String 20 – – – –

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Table B-17. ManufBlock1..4

Related Variables:

• DF:System Data:Manufacturer Info(58):Manuf. Block 1..4(32..95)

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B.28 ManufacturerInfo (0x70)

This read/write block function returns the data stored in Manuf. Info where byte 0 is the MSB with a maximum length of 31 data + 1 length byte. This command is also accessible in Sealed mode. See the bq20z60-R1/bq20z65-R1 data sheet (SLUS801A, SLUS800) for allowable number of write cycles.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x70 R/W ManufacturerInfo String 31 +1 – – – –

Related Variables:

• DF:System Data:Manufactuer Info(58):Manuf. Info 0(0)

• SBS:OperationStatus(0x54)[SS],[FAS]

B.29 SenseResistor (0x71)

This read or write word command allows the user to change the sense resistor value used in μΩ. The bq20z60-R1/bq20z65-R1 automatically updates the associated calibration data on receipt of a new sense resistor value.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x71 R/W SenseResistor Unsigned 2 0 65,535 10,000 μΩ

ManufacturerInfo (0x70)

Table B-18. ManfacturerInfo

Table B-19. SenseResistor

integer

B.30 TempRange (0x72)

This read-word function returns the present temperature range in effect.

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

High Byte RSVD RSVD RSVD RSVD RSVD RSVD RSVD RSVD

Low Byte RSVD RSVD TR5 TR4 TR3 TR2A TR2 TR1

LEGEND: All values read-only. RSVD = Reserved

• TR1 – 1 = temperature range 1: Temperature < JT1

• TR2 – 1 = temperature range 2: JT1 < Temperature < JT2

• TR2A – 1 = temperature range 3: JT2 < Temperature < JT2a

• TR3 – 1 = temperature range 4: JT2a < Temperature < JT3

• TR4 – 1 = temperature range 5: JT3 < Temperature < JT4

• TR5 – 1 = temperature range 6: JT4 < Temperature

Figure B-13. TempRange

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LifetimeData1 (0x73)

B.31 LifetimeData1 (0x73)

This read-block function returns the lifetime data, including lifetime temperature samples.

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LifetimeData2 (0x74)

Table B-20. LifetimeData1

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x73 R LifetimeData1 String 32 + 1 – – – –

Table B-21. LifetimeData1 Block Format

Byte Data Byte Data

0 Lifetime Temp Max 16 Lifetime Max Chg Power 1 17 2 Lifetime Min Temp 18 Lifetime Max Dsg Power 3 19 4 Lifetime Max Cell Voltage 20 Lifetime Max Avg Dsg Current 5 21 6 Lifetime Min Cell Voltage 22 Lifetime Max Avg Dsg Power 7 23 8 Lifetime Max Pack Voltage 24 Lifetime Avg Temp

9 25 10 Lifetime Min Pack Voltage 26 LT Temp Samples 11 27 12 Lifetime Max Chg Current 28 13 29 14 Lifetime Max Dsg Current 30 15 31

B.32 LifetimeData2 (0x74)

This read-block function returns second part of the lifetime data including OT and OV event count and duration.

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x74 R LifetimeData2 String 8 + 1 – – – –

Table B-23. LifetimeData2 Block Format

Byte Data

0 OT Event Count 1 2 OT Event Duration 3 4 OV Event Count 5 6 OV Event Duration 7

B.33 DataFlashSubClassID (0x77)

This write word function sets the bq20z60-R1/bq20z65-R1 data flash subclass, where data can be accessed by following the DataFlashSubClass1..8 commands.

See Accessing Data Flash, Section C.1, for further information.

Table B-22. LifetimeData2

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DataFlashSubClassPage1..8 (0x78..0x7f)

A NACK is returned to this command if the value of the class is outside of the allowed range. The subclasses are defined in the data flash.

Table B-24. DataFlashSubClassID

SBS Cmd. Mode Name Format Size in Bytes Min Value Max Value Default Value Unit

0x77 W DataFlashSubClas Hex 2 0x0000 0xffff – –

sID

Related Variable:

• SBS:DataFlashSubClassPage1..8(0x78..0x7f)

B.34 DataFlashSubClassPage1..8 (0x78..0x7f)

These commands are used to access the consecutive 32-byte pages of each subclass. DataFlashSubClassPage1 gets bytes 0 to 31 of the subclass, DataFlashSubClassPage2 gets bytes 32 to 63, and so on.

NOTE: Any DF location deemed reserved responds with a NACK unless the

bq20z60-R1/bq20z65-R1 is in the correct security state to allow access.

Table B-25. DataFlashSubClass1..8

SBS Cmd.

0x78 R/W DataFlashSubClassPage1 Hex 32 0 31 – – 0x79 R/W DataFlashSubClassPage2 Hex 32 32 63 – – 0x7a R/W DataFlashSubClassPage3 Hex 32 64 95 – – 0x7b R/W DataFlashSubClassPage4 Hex 32 96 127 – – 0x7c R/W DataFlashSubClassPage5 Hex 32 128 159 – – 0x7d R/W DataFlashSubClassPage6 Hex 32 160 191 – – 0x7e R/W DataFlashSubClassPage7 Hex 32 192 223 – – 0x7f R/W DataFlashSubClassPage8 Hex 32 224 255 – –

Mode Name Format Size in Bytes Subclass Offset Subclass Offset Default Value Unit

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Related Variable:

• SBS:DataFlashSubClassID(0x77)

B.35 Extended SBS Command Values

Table B-26. EXTENDED SBS COMMANDS

SBS Cmd Size in Bytes Default

0x45 R AFEData String 11+1 — — — ASCII 0x46 R/W FETControl Hex 2 0x00 0xff — — 0x4f R StateOfHealth Hex 2 0x0000 0xffff — — 0x50 R SafetyAlert Hex 2 0x0000 0xffff — — 0x51 R SafetyStatus Hex 2 0x0000 0xffff — — 0x52 R PFAlert Hex 2 0x0000 0xffff — — 0x53 R PFStatus Hex 2 0x0000 0xffff — — 0x54 R OperationStatus Hex 2 0x0000 0xffff — — 0x55 R ChargingStatus Hex 2 0x0000 0xffff — — 0x57 R ResetData Hex 2 0x0000 0xffff — — 0x58 R WDResetData Unsigned 2 0 65535 — —

0x5a R PackVoltage Unsigned 2 0 65535 — mV

Mode Name Format Min Value Max Value Unit

Value

integer

Extended SBS Commands SLUU386–January 2010

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Extended SBS Command Values

Table B-26. EXTENDED SBS COMMANDS (continued)

SBS Cmd Size in Bytes Default

0x5d R AverageVoltage Unsigned 2 0 65535 — mV

0x5e R TS1Temperature Integer 2 –400 1200 — 0.1°C 0x5f R TS2Temperature Integer 2 –400 1200 — 0.1°C 0x60 R/W UnSealKey Hex 4 0x00000000 0xffffffff — — 0x61 R/W FullAccessKey Hex 4 0x00000000 0xffffffff — — 0x62 R/W PFKey Hex 4 0x00000000 0xffffffff — — 0x63 R/W AuthenKey3 Hex 4 0x00000000 0xffffffff — — 0x64 R/W AuthenKey2 Hex 4 0x00000000 0xffffffff — — 0x65 R/W AuthenKey1 Hex 4 0x00000000 0xffffffff — — 0x66 R/W AuthenKey0 Hex 4 0x00000000 0xffffffff — — 0x68 R SafetyAlert2 Hex 2 0x0000 0x000f — — 0x69 R SafetyStatus2 Hex 2 0x0000 0x000f — — 0x6a R PFAlert2 Hex 2 0x0000 0x000f — — 0x6b R PFStatus2 Hex 2 0x0000 0x000f — — 0x6c R/W ManufBlock1 String 20 — — — — 0x6d R/W ManufBlock2 String 20 — — — — 0x6e R/W ManufBlock3 String 20 — — — — 0x6f R/W ManufBlock4 String 20 — — — — 0x70 R/W ManufacturerInfo String 31+1 — — — — 0x71 R/W SenseResistor Unsigned 2 0 65535 — μΩ

0x72 R TempRange Hex 2 0x0000 0xffff — — 0x73 R LifetimeData1 String 32+1 — — — — 0x74 R LifetimeData2 String 8+1 — — — — 0x77 R/W DataFlashSubClassID Hex 2 0x0000 0xffff — — 0x78 R/W DataFlashSubClassPage1 Hex 32 — — — — 0x79 R/W DataFlashSubClassPage2 Hex 32 — — — — 0x7a R/W DataFlashSubClassPage3 Hex 32 — — — — 0x7b R/W DataFlashSubClassPage4 Hex 32 — — — — 0x7c R/W DataFlashSubClassPage5 Hex 32 — — — — 0x7d R/W DataFlashSubClassPage6 Hex 32 — — — — 0x7e R/W DataFlashSubClassPage7 Hex 32 — — — — 0x7f R/W DataFlashSubClassPage8 Hex 32 — — — —

Mode Name Format Min Value Max Value Unit

integer

Value

SLUU386–January 2010 Extended SBS Commands

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100

Extended SBS Commands SLUU386–January 2010

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TEXAS INSTRUMENTS bq20z60-R1, bq20z65-R1 Technical data

Specifications and Main Features

Frequently Asked Questions

User Manual

1.1 Read This First

1.2 Notational Conventions

Preface

2.1 JEITA Temperature Ranges

Detailed Description

2.2 1st Level Protection Features

2.2.1 Cell Overvoltage (COV) and Cell Undervoltage (CUV)

2.2.2 Charge and Discharge Overcurrent

2.2.3 Short-Circuit Protection

2.2.4 Overtemperature Protection

2.2.5 Host Watchdog

2.2.6 AFE Watchdog

2.3 2nd Level Protection Features

2.3.1 2nd Level (Permanent) Failure Actions

2.3.2 Time-Limit-Based Protection

2.3.3 Limit-Based Protection

2.3.4 Clearing Permanent Failure

2.4 Gas Gauging

2.4.1 Impedance Track Configuration

2.4.2 Gas Gauge Modes

2.4.3 Qmax

2.4.3.1 Qmax Initial Values

2.4.3.2 Qmax Update Conditions

2.5 Charge Control

2.5.1 Charge Control SMBus Broadcasts

2.5.2 Cell Balancing

2.5.3 Charge-Inhibit Mode

2.5.4 Charge-Suspend Mode

2.5.5 Charging and Temperature Ranges

2.5.5.1 Low Temperature Charging

2.5.5.2 Standard Temperature Charging 1

2.5.5.3 Standard Temperature Charging 2

2.5.5.4 High Temperature Charging

2.5.6 Precharge

2.5.7 Primary Charge Termination

2.5.8 Charging Faults

2.5.9 Discharge and Charge Alarms

2.6 Discharge-Inhibit Mode

2.7 LED Display

2.7.1 Display Activation

2.7.2 Display Configuration

2.7.3 Display Format

2.7.4 Permanent Failure Error Codes

2.7.5 LED Current Configuration

2.8 Device Operating Mode

2.8.1 Normal Mode

2.8.2 Battery Pack Removed Mode/System Present Detection

2.8.2.1 Battery Pack Removed

2.8.2.2 System Present

2.8.3 Sleep Mode

2.8.4 Wake Function

2.8.5 Shutdown Mode

2.8.6 Ship Mode

2.9 Security (Enables and Disables Features)

2.10 Calibration

2.10.1 Coulomb-Counter Dead Band

2.10.2 Autocalibration

2.11 Communications

2.11.1 SMBus On and Off States

2.11.2 Packet Error Checking

2.11.3 bq20z60-R1/bq20z65-R1 Slave Address

2.11.4 Broadcasts to Smart Charger and Smart Battery Host

A.1 ManufacturerAccess (0x00)

A.1.1 System Data

A.1.1.1 Device Type (0x0001)

A.1.1.2 Firmware Version (0x0002)

A.1.1.3 Hardware Version (0x0003)

A.1.1.4 DF Checksum (0x0004)

A.1.1.5 Manufacturer Status (0x0006)

A.1.1.6 Chemistry ID (0x0008)

A.1.2 System Control

A.1.2.1 Shutdown (0x0010)

A.1.2.2 Sleep (0x0011)

A.1.2.3 Seal Device (0x0020)

A.1.2.4 IT Enable (0x0021)

A.1.2.5 SAFE Activation (0x0030)