Maxim MAX1660EEE Datasheet

General Description

The MAX1660 digitally controlled fuel-gauge interface
executes two essential functions for rechargeable bat­tery-pack management: fuel gauging and pack overcur­rent protection. It accurately monitors a battery pack’s
charge and discharge current flow, and records each
using two independent, on-board Coulomb counters.
Each counter’s contents are externally accessible via a
System Management Bus (SMBus™)-compatible 2-wire
serial interface. An optional third wire interrupts the
microcontroller (µC) when the charge or discharge
counters reach a preset value, or when an overcurrent
condition (charge or discharge) occurs. In the event of
an overcurrent or short-circuit condition, the MAX1660
disconnects the load and alerts its host. The MAX1660’s
flexibility allows accurate fuel gauging for any battery
chemistry, using any desired control algorithm.

The MAX1660 operates with battery voltages from +4V
to +28V and provides two micropower shutdown
modes, increasing battery lifetime. To minimize total
parts count, the device integrates a precision 2.00V
system-reference output, a 3.3V linear-regulator output
that can supply up to 5mA to power external circuitry,
and a power-on reset output for the system µC. The
MAX1660 is available in a 16-pin QSOP package.

________________________Applications

Smart-Battery Packs Battery-Pack Fuel Gauging
Battery-Pack Overcurrent Digital Current-Sense

Protection Instrumentation
Industrial-Control System Analog-to-Digital

Interfaces Conversion

____________________________Features

♦ 1% Accuracy over a 600µA to 4A Current Range

(R

SENSE

= 30mΩ)

♦ 5µV Input Offset Voltage (28µV max)
♦ SMBus 2-Wire (plus optional interrupt)

Serial Interface

♦ 2.00V Precision System Reference Output
♦ 3.3V Linear-Regulator Output Powers External

Circuitry

♦ Two Micropower Shutdown Modes
♦ Independent 32-Bit Charge and Discharge

Coulomb Counters

♦ Battery-Overcharge/Overdischarge Protection
♦ Battery Short-Circuit/Overcurrent Protection
♦ On-Board Power MOSFET Drivers
♦ 80µA Quiescent Current
♦ <1µA Shutdown Current
♦ Small 16-Pin QSOP Package

(same board area as 8-pin SO)

MAX1660

*

Digitally Controlled

Fuel-Gauge Interface

________________________________________________________________

Maxim Integrated Products

1

19-1308; Rev 1; 10/98

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

SMBus is a trademark of Intel Corp.

*

Patent pending

MAX1660

BATT

CS

AGND

REF

OCI
ODI

GND

SCL
SDA

SHDN

OCO

VL

V

CC

GND

PACK-

PACK+

µC

RST

INT

ODO

R

CS

___________________________________________________Typical Operating Circuit

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone].
For small orders, phone [phone].

PART

MAX1660EEE -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

16 QSOP

Ordering Information

Pin Configuration appears at end of data sheet.

*

Patent pending

MAX1660

*

Digitally Controlled
Fuel-Gauge Interface

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

SHDN

= V

BATT

= 12V, V

SCL

= V

SDA

= 3.6V, C

REF

= 10nF, CVL= 0.1µF, TA= 0°C to +85°C, unless otherwise noted. Typical values

are at T

A

= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

BATT, ODO, OCO, SHDN to GND .........................-0.3V to +30V

SCL, SDA, INT, RST to GND ....................................-0.3V to +6V

REF, ODI, OCI to GND..................................-0.3V to (VL + 0.3V)

VL to GND ................................................................-0.3V to +6V

CS to GND...................................................................-2V to +6V

AGND to GND.............................................................-1V to +1V

Continuous Power Dissipation (T

A

= +70°C)

16-Pin QSOP (derate 8.3mW/°C above +70°C).............667mW

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range.............................-65°C to +165°C

Lead Temperature (soldering, 10sec).............................+300°C

V

OCO

= 0.4V

V

ODO

= 28V

V

SHDN

= 3.3V, SOFTSHDN = 0, IVL= 0

V

ODO

= 0.4V

(Note 1)

VCS= 120mV

VCS= 0

0 ≤ I

REF

≤ 200µA

I

REF

= 0

V

SHDN

= 3.3V, SOFTSHDN = 1, IVL= 0

V

SHDN

≤ 0.4V

SOFTSHDN = 0, 0 ≤ IVL≤ 5mA

VCS= -120mV

SOFTSHDN = 1, 0 ≤ IVL≤ 5mA

VCS= 0

CONDITIONS

mA1 2.5OCO Sink Current

µA0.01 1ODO Off-Leakage Current

mA1 2.5ODO Sink Current

µs1Propagation Delay

µA-1 0.01 1OCI, ODI Input Offset Current

mV-7 0 7OCI, ODI Input Offset Voltage

49,500 50,000 50,500

counts/

sec

0212

Charge Coulomb-Counter
Accumulation Rate

49,500 50,000 50,500

counts/

sec

0212

Discharge Coulomb-Counter
Accumulation Rate

µA

80 135

I

BATT

BATT Supply Current

V428V

BATT

BATT Input Voltage Range

kΩ100CS to AGND Input Resistance

µV/µA10 50REF Load Regulation

V1.96 2.00 2.04V

REF

REF Output Voltage

15 30

0.02 1
V

3.1 3.25 3.4

V

VL

VL Output Voltage

3.1 3.25 3.6

UNITSMIN TYP MAXSYMBOLPARAMETER

V

INT

= 0.4V

V

SDA

= 0.6V

SHDN

SCL, SDA

SHDN, SCL, SDA

V

OCO

= 28V

mA2V

OL

INT Output Low Sink Current

mA6V

OL

SDA Output Low Sink Current

0.6

V

0.8

V

IL

Input Low Voltage

V2.2V

IH

Input High Voltage

µA0.01 1OCO Off-Leakage Current

SUPPLY AND REFERENCES

FUEL GAUGE

OVERCURRENT COMPARATOR

INTERFACE-LOGIC LEVELS

MAX1660

*

Digitally Controlled

Fuel-Gauge Interface

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(V

SHDN

= V

BATT

= 12V, V

SCL

= V

SDA

= 3.6V, C

REF

= 10nF, CVL= 0.1µF, TA= 0°C to +85°C, unless otherwise noted. Typical values

are at T

A

= +25°C.)

V

TH1

, VL rising

VVL= 3V, I

SINK

= 1.2mA

CONDITIONS

VVL= 1V, I

SINK

= 50µA

V

TH2

, VL falling

2.75 2.90 3.05

V

1.0 1.7 2.2

0.3

V

0.3

V

RST

RST Output Voltage

V

TH1

,

V

TH2

RST Threshold Voltage

UNITSMIN TYP MAXSYMBOLPARAMETER

SHDN forced to 28V

SHDN forced to 3.6V

Output forced to 5V

ms25

RST Active Timeout Period

20 100

µA

0.7 3.0

I

SHDN

SHDN Input Bias Current

µA0.01 1

SCL, SDA, INT, RST Leakage
Current

V

ODO

= 0.4V

V

ODO

= 28V

V

SHDN

= 3.3V, SOFTSHDN = 0, IVL= 0

V

ODO

= 0.4V

(Note 1)

VCS= 120mV

VCS= 0

0 ≤ I

REF

≤ 200µA

I

REF

= 0

V

SHDN

= 3.3V, SOFTSHDN = 1, IVL= 0

V

SHDN

≤ 0.4V

SOFTSHDN = 0, 0 ≤ IVL≤ 5mA

VCS= -120mV

SOFTSHDN = 1, 0 ≤ IVL≤ 5mA

VCS= 0

CONDITIONS

mA1OCO Sink Current

µA1ODO Off-Leakage Current

mA1ODO Sink Current

µA-1 1OCI, ODI Input Offset Current

mV-10 10OCI, ODI Input Offset Voltage

49,250 50,750

counts/

sec

012

Charge Coulomb-Counter
Accumulation Rate

counts/

sec

012

Discharge Coulomb-Counter
Accumulation Rate

µA

135

I

BATT

BATT Supply Current

V428V

BATT

BATT Input Voltage Range

µV/µA50REF Load Regulation

V1.96 2.04V

REF

REF Output Voltage

30

1

V

3.1 3.4

V

VL

VL Output Voltage

3.1 3.6

UNITSMIN TYP MAXSYMBOLPARAMETER

V

ODO

= 28V µA1OCO Off-Leakage Current

ELECTRICAL CHARACTERISTICS

(V

SHDN

= V

BATT

= 12V, V

SCL

= V

SDA

= 3.6V, C

REF

= 10nF, CVL= 0.1µF, TA= -40°C to +85°C, unless otherwise noted.) (Note 2)

SUPPLY AND REFERENCES

FUEL GAUGE

OVERCURRENT COMPARATOR

*

Patent pending

*

Patent pending

MAX1660

*

Digitally Controlled
Fuel-Gauge Interface

4 _______________________________________________________________________________________

V

TH1

, VL rising

VVL= 3V, I

SINK

= 1.2mA

CONDITIONS

VVL= 1V, I

SINK

= 50µA

V

TH2

, VL falling

2.75 3.05

V

1.0 2.2

0.3

V

0.3

V

RST

RST Output Voltage

V

TH1

,

V

TH2

RST Threshold Voltage

UNITSMIN TYP MAXSYMBOLPARAMETER

SHDN forced to 28V

SHDN forced to 3.6V

Output forced to 5V

V

INT

= 0.4V

V

SDA

= 0.6V

SHDN

SCL, SDA

SHDN, SCL, SDA

120

µA

3.0

I

SHDN

SHDN Input Bias Current

µA1

SCL, SDA, INT, RST Leakage
Current

mA2V

OL

INT, RST Output Low Sink Current

mA6V

OL

SDA Output Low Sink Current

0.6

V

0.8

V

IL

Input Low Voltage

V2.2V

IH

Input High Voltage

ELECTRICAL CHARACTERISTICS (continued)

(V

SHDN

= V

BATT

= 12V, V

SCL

= V

SDA

= 3.6V, C

REF

= 10nF, CVL= 0.1µF, TA= -40°C to +85°C, unless otherwise noted.) (Note 2)

TIMING CHARACTERISTICS

(TA= 0°C to +85°C, unless otherwise noted.)

CONDITIONS

µs4.7t

SU:STA

Start-Condition Setup Time

µs4.7t

LOW

µs4t

HIGH

SCL Serial-Clock High Period
SCL Serial-Clock Low Period

µs4t

HD:STA

Start-Condition Hold Time

ns800t

SU:DAT

SDA Valid to SCL Rising-Edge Setup
Time, Slave Clocking in Data

ns0t

HD:DAT

SCL Falling Edge to SDA Transition

µs1t

DV

SCL Falling Edge to SDA Valid, Master
Clocking in Data

UNITSMIN TYP MAXSYMBOLPARAMETER

INTERFACE-LOGIC LEVELS

MAX1660

*

Digitally Controlled

Fuel-Gauge Interface

_______________________________________________________________________________________ 5

SCL

START

CONDITION

t

HIGH

SDA

t

LOW

t

HD:STA

t

SU:STA

t

SU:DAT

t

HD:DAT

t

SU:DAT

t

HD:DAT

MOST SIGNIFICANT ADDRESS BIT

(A6) CLOCKED INTO SLAVE

A5 CLOCKED

INTO SLAVE

A4 CLOCKED

INTO SLAVE

A3 CLOCKED

INTO SLAVE

Note 1: OCI and ODI are MOSFET inputs. Minimum and maximum limits are for production screening only. Actual performance is

indicated in typical value.

Note 2: Specifications to -40°C are guaranteed by design, not production tested.

CONDITIONS

µs1t

DV

SCL Falling Edge to SDA Valid, Master
Clocking in Data

ns0t

HD:DAT

SCL Falling Edge to SDA Transition

ns800t

SU:DAT

SDA Valid to SCL Rising-Edge Setup
Time, Slave Clocking in Data

µs4t

HD:STA

Start-Condition Hold Time

µs4.7t

SU:STA

Start-Condition Setup Time

µs4.7t

LOW

SCL Serial-Clock Low Period

µs4t

HIGH

SCL Serial-Clock High Period

UNITSMIN TYP MAXSYMBOLPARAMETER

TIMING CHARACTERISTICS

(TA= -40°C to +85°C, unless otherwise noted.) (Note 2)

Figure 1. SMBus Serial-Interface Timing—Address

SCL

RW BIT

CLOCKED

INTO SLAVE

SDA

t

DV

t

DV

ACKNOWLEDGE

BIT CLOCKED
INTO MASTER

SLAVE PULLING
SDA LOW

MOST SIGNIFICANT BIT

OF DATA CLOCKED

INTO MASTER

Figure 2. SMBus Serial-Interface Timing—Acknowledge

*

Patent pending

*

Patent pending

MAX1660

*

Digitally Controlled
Fuel-Gauge Interface

6 _______________________________________________________________________________________

__________________________________________Typical Operating Characteristics

(V

BATT

= V

SHDN

= 12V, C

REF

= 10nF, CVL= 0.1µF, TA= +25°C, unless otherwise noted.)

50

60

70

80

90

100

412816202428

SUPPLY CURRENT vs. V

BATT

MAX1660-01

V

BATT

(V)

SUPPLY CURRENT (µA)

TA = +85°C

TA = +25°C

TA = -40°C

10

12
11

14
13

16
15

18

19

17

20

412816202428

SHUTDOWN SUPPLY CURRENT

vs. V

BATT

MAX1660-02

V

BATT

(V)

SUPPLY CURRENT (µA)

SOFTSHDN = 1

TA = -40°C

TA = +25°C

TA = +85°C

0.01

0.02

0.03

0.04

0.05

412816202428

SHUTDOWN SUPPLY CURRENT

vs. V

BATT

MAX1660-03

V

BATT

(V)

SUPPLY CURRENT (µA)

TA = +25°C

TA = +85°C

SHDN = GND

T

A

= -40°C

3.15

3.18

3.21

3.24

3.27

3.30

0 1.5 2.00.5 1.0 2.5 3.0 3.5 4.0 4.5 5.0

VL VOLTAGE vs. VL LOAD CURRENT

MAX1660-04

LOAD CURRENT (mA)

VL VOLTAGE (V)

TA = +25°C

TA = +85°C

TA = -40°C

1.994

1.996

1.998

2.000

2.002

2.004

0608020 40 100 120 140 160 180 200

REFERENCE VOLTAGE

vs. REFERENCE LOAD CURRENT

MAX1660 05

LOAD CURRENT (µA)

VOLTAGE (V)

TA = +25°C

TA = +85°C

TA = -40°C

-4

-2

0

2

6

4

8

-15 -5-10 0 5 10

FREQUENCY vs. INPUT VOLTAGE

MAX1660-06

INPUT VOLTAGE (µV)

FREQUENCY (Hz)

INPUT
OFFSET
FREQUENCY

INPUT OFFSET

VOLTAGE

150

90

120

60

0

30

120

90
60
30

150

-360

-120

0

-240

120 240 360

FREQUENCY vs. INPUT VOLTAGE

MAX1660-07

INPUT VOLTAGE (mV)

FREQUENCY (kHz)

IDEAL

MEASURED

CHGCOUNT

DISCOUNT

456

404

0.001 0.01 0.1 1 10 100 1000

CONVERSION GAIN vs. INPUT VOLTAGE

416
412
408

MAX1660-08

INPUT VOLTAGE (mV)

CONVERSION GAIN (Hz/mV)

424
420

436
432
428

448
444
440

452

*SEE INTERNAL OFFSET MEASUREMENT SECTION

OFFSET

CORRECTED*

275:1

6000:1

UNCORRECTED*