Mitsubishi M61040FP Datasheet
Smart battery protection and monitoring IC
M61040FP
_OUT
M61040FP
DESCRIPTION
The M61040FP is intended to be used as SB: Smart Battery.
All functions needed for SB are packed to this M61040FP. The
combination use with Microcomputer such as M37515 will give various
functions such as a detection or calculation of SB Remaining Capacity.
Over Current detection circuit dedicated in M61040FP will give safety
FET on/off control independent from microcomputer control.
The amp gain of charge/discharge current detection circuit is controlled
by microcomputer, therefore the accuracy of SB’s Remaining Capacity
Detection becomes better than before. The reset circuit and The linear
regulator for Vcc / Vref of microcomputer are dedicated in M61040FP. So
this will help easy design of power circuit design of SB.
VCC
CFOUT
PFOUT
DFOUT
VIN_1
VIN_2
VIN_3
VIN_4
VIN_12
GND
PIN configuration (Top view)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
Vreg
Vref
Reset
DI
CK
CS
Analog_out
CIN
VIN_11
VIN_10
FEATURE
l Built-in high gain op-amps for monitoring charge/discharge current
l Built-in over current detection circuit for FET protection
l All FETs are controlled by microcomputer
l Various powers saving function to reduce total power dissipation
l High Input Voltage Device(Absolute Maximum Rating:33V)
APPLICATION
l Smart Battery System
Block diagram
VCC
Vreg
Vref
Reset
CK
DI
CS
Series
Regulator
Serial to
Parallel
conversion
circuit
Regulator
ON/OFF and
Reset circuit
Over current
detection
circuit
CINVIN_12 PFOUTCFOUT DFOUT
Delay circuit
Battery cell
voltage
detection
circuit
20P-TSSOP
VIN_1
VIN_2
VIN_3
Analog
Multi- plexer
circuit
Gain selector
Offset
control
Charge/Discharge current detection circuit
Mitsubishi Electric
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VIN_10VIN_11
Battery cell 1-4
voltage analog
output
VIN_4
GND
Smart battery protection and monitoring IC
RESET
M61040FP
1. Explanation of terminals
Table 1.
PIN Symbol Functions
5 VIN 1 Battery 1 + voltage input
6 VIN 2 Battery 1 – voltage and Battery 2 + voltage input
7 VIN 3 Battery 2 – voltage and Battery 3 + voltage input
8 VIN 4 Battery 3 – voltage and Battery 4 + voltage input
9 VIN 12 Monitoring charger is connected or not
13 CIN Connect capacitor for over current detection delay
11 VIN 10
12 VIN 11
1 V
10 GND Ground
20 Vreg Linear-Regulator output for microcomputer
19 Vref Vreg voltage output for Vreg of Microcomputer, Max 200uA / 5V
18
14 Analog OUT Various Analog signal outputs to AD-input of Microcomputer
4 DFOUT Discharge FET-Drive Output. The Driver is turned off when over current detected.
2 CFOUT Charge FET-Drive Output. The Driver is turned off by Microcomputer.
17 DI Input of 6 bit length serial data from Microcomputer
16 CK Input of shift clock from Microcomputer. DI’s input data is latched by low-to-high edge of
15 CS During low signal input to this CS, data input to DI is enabled.
3 PFOUT Pre-charge FET-Drive Output. The Driver is turned off by Microcomputer.
CC
Charge / discharge current monitor input and connects charge / discharge current
Sense resistor
Charge / discharge current monitor input and connects charge / discharge current
Sense resistor
Power source pin. Power from charger or battery
Reset signal output to RESET of Microcomputer
this CK
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Smart battery protection and monitoring IC
M61040FP
2. Operation description
M61040 is developed for intelligent Li-ion battery pack such as SB in SBS. M61040 is suitable for Smart
Battery.
*SBS: Smart Battery System introduced by Intel and Duracell
*SB: Smart Battery which contains 3 or 4 series Li-ion battery cells.
All analog circuits are included to M61040. Therefore pair using with Microcomputer such as M37515
and small additional parts will give various functions such as battery remaining capacity detection. All
functions are described as follows:
1)Voltage Detection circuit of each Li-ion battery cells
M61040 can output each battery cell’s voltage of 3 or 4 series connection. Built-in buffer amplifier is
monitoring each battery voltage. Microcomputer can adjust the offset voltage.
2)Charge / discharge current detection circuit
In SBS, remaining capacity check function (Gas-gage function ) is necessary. To calculate accurate
remaining capacity, microcomputer must get charge / discharge current periodically. Accurate charge /
discharge current of external sense register is monitored by built-in amp. The charger/ discharge
current is converted to Voltage value through the accurate sense resistor.
Output gain can be controlled by Microcomputer. Off-set voltage can be set lower by external parts,
therefore dynamic range of Microcomputer’s A to D converter will widen.
3) Over current detection circuit
M61040 contains over current detection circuit. The discharging FET is turned off to stop discharging
and it continues for the over current detection delay time (tIOV1) or longer, if the discharging current
becomes equal to or higher than a specified value. It is necessary for safety of Li-ion battery pack.
Delay time is set by external capacity connected to CIN. Also the voltage of CIN shows detection or
NOT detection of over current. Over current detection is controlled independently by this M61040’s
built-in hardware NOT by Microcomputer’s software control.
4) Series regulator, reference voltage
M61040 contains Low drop out series regulator. Microcomputer in SB does not need any additional
voltage regulator, MAX 20mA/5V. Also M61040 gives very accurate reference voltage as 4.85V for Vref
voltage for Microcomputer’s A to D converter.
5) Reset circuit for Microcomputer
Vreg output voltage is checked by Reset circuit of M61040. Therefore, lower voltage of Vreg issues
RESET signal to stop mull-function of Microcomputer. Also, lower voltage after long time’s left issues
RESET signal to stop mull-function of Microcomputer. This function is useful for safety of long time’s
left battery.
When charger is connected to SB, this circuit will check Vreg voltage, so if Vreg voltage is NOT
enough high, this circuit remains Low as for RESET signal to Microcomputer.
Mitsubishi Electric
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Smart battery protection and monitoring IC
M61040FP
6) Power save function
M61040FP contains power save function to control several supply current.
The function and control method are shown as table 2.
The function of battery voltage detection circuit, Charge/Discharge detection circuit, Over current
detection circuit can be stopped as the need arises.
Table 2
Control method
Battery voltage
detection circuit
Charge/Discharge
detection circuit
Over current
detection circuit
Software control
(through Serial I/F)
Enter Power Down Mode
Microcomputer issues shot-down command to M61040 after microcomputer detects that battery
voltage is too low. After this command, the DFOUT pin is set to `high` and the Vin_12pin is pulled
down by internal resistor to be set `low` and series regulator are turned off.
In the power down mode, the M61040 operation is impossible. And CFOUT, DFOUT and PFOUT
pins are set to `high`. (In this situation, both charging and discharging are forbidden. )
At this time, supply current becomes max. 1.0µA ,so drops of battery voltage is prevented.
Ο Ο Ο
Each function can be ON/OFF separately.
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Smart battery protection and monitoring IC
M61040FP
M61040FP
GND level
in discharging
Vreg
Vref
RESET
CK
DI
CS
VIN12
V
CC
CFOUT
Series
Regulator
Regulator
ON/OFF Control
Reset Circuit
Serial to Parallel
conversion
circuit
PFOUT
Control signal
from I/F circuit
DFOUT
VIN1
Figure1. Function after detecting over-discharge
Resume from Power Down Mode
After entering Power Down mode, the series regulator will begin operation when charger is
connected(VIN_12 pin is high). The RESET will output low to high signal when Vreg is over reset level
voltage. Microcomputer will begin operation and send command to resume M61040 from Power Down
mode.
7) Conditioning Circuit
M61040 have a discharge circuit of each cells. It is available for drop of cell voltage for safety purpose.
And to shorten the difference voltage among the cells . It can extend the battery pack life.
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Smart battery protection and monitoring IC
3
3
3
M61040FP
3. Absolute Maximum Ratings
Table 3
ITEM SYMBOL CONDITION RATINGS UNIT
Absolute maximum rating
Supply voltage
Power dissipation
Operating temperature range
Storage temperature range
4.Electrical Characteristics
(Ta=25°C VCC=14V ,unless otherwise noted)
ITEM SYMBOL CONDITION Min. Typ. Max. UNIT
Supply voltage
Isup1
Isup2
Vdif0 Iout=20mA
∆ Vout10 VCC=6.2∼ 24V Iout=20mA
∆ Vout20 VCC=6.2V Iout=50µA∼20mA
V
TOTAL
(at Power save mode)
(at Power Down mode)
REGULATOR
Input and output voltage
REFERENCE
VOLTAGE
Supply current 1
Supply current 2
Supply current
Supply current
Output voltage
Difference
Linear regulation
Load regulation
Input voltage
Output voltage
Vcc
Ips
Ipd All operation stop, VIN 12=GND
Vreg Iout=20mA 5.145 5.2 5.295 V 3
0 V
IN
Vref Iout=200µA 4.818 4.85 4.917 V 4
Vabs 33 V
Vcc 30 V
P
T
opr
T
750 mW
D
stg
1
− 20 ∼ + 85 °C
− 40 ∼ + 125 °C
Table 4
Voltage monitor ,V/R, reset ON
Current monitor ON
Voltage monitor ,V/R, reset ON
Current monitor OFF
Regulator ON, Non-loading,
Reset circuit ON,Others OFF
voltage
CC
105 200 280 µA 7
65 120 165 µA 7
35 60 85 µ A 7
0.3 0.8 V 3
100 200 mV 3
30 45 mV 3
30 V
0.5 µ A 7
30 V
Circuit
Load stability
Over current inhibit
OVER CURRENT
DETECTION
Detection voltage 1
Over current inhibit
detection voltage 2
Over current inhibit
detection delay time1
Over current inhibit
detection delay time 2
∆ Vout21 VCC=6.2V Iout=50∼ 200µA
Vcl VCL− 0.02 0.2 VCL+ 0.02 V 8
V
Vch Load short detection
CC
×
Tvcl CICT=0.01µF 7 10 15
Tvch 150 250 350 µsec 8
5 45 mV 4
V
0.6
V
CC
CC
×1.4
V 8
mse
c
5
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Smart battery protection and monitoring IC
M61040FP
Table 4
(Ta=25°C VCC=14V ,unless otherwise noted)
ITEM SYMBOL CONDITION Min. Typ. Max. UNIT
BATTERY VOLTAGE
Input Offset voltage Voff1 31 208 385 mV 5
DETECTION
Voltage gain 1 Gamp1 0.99 1.0 1.01 5
Output source current
Isource1 150
Output sink current Isink1 150
Circuit
µA 10
µA 10
Detection voltage of
battery cell
CURRENT DETECTION
CHARGE/DISCHARGE
Input Offset voltage Voff2 Gain=200 selected 0.2 2 3.8 V 5
Vref− Voff1 4.45 V 5,6
Voltage gain21 Gain21 38.4 40 41.6 V 5
Voltage gain22 Gain22 96 100 104 V 5
Voltage gain23 Gain23 192 200 208 V 5
Output source current
Isource2 150
Output sink current Isink2 150
DI input H voltage VDIH 3.5
INTERFACE
DI input L voltage VDIL 0
CS input H voltage VCSH 3.5
CS input L voltage VCSL 0
CK input H voltage VCKH 3.5
CK input L voltage VCKL 0
Vreg V 1
0.5 V 1
Vreg V 1
0.5 V 1
Vreg V 1
0.5 V 1
RESET
Detection voltage1 Vdet − 3.045 3.25 3.475 V 2
Release voltage1 Vdet + 4.16 4.2 4.27 V 2
CONDITIONING
CIRCUIT
VIN 1 resistor RINV1 4.4 12 27 KΩ 6
VIN 2 resistor RINV2 4.4 12 27 KΩ 6
µA 9
µA 9
VIN 3 resistor RINV3 4.4 12 27 KΩ 6
V
4 resistor RINV4 4.4 12 27 KΩ 6
IN
Reference period
CK
TSDI
THDI
DI
THCSTSCS
CS
Figure 3 Interface Timing
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Smart battery protection and monitoring IC
M61040FP
5. Measurement circuit
PFOUT DFOUT
CFOUT
VCC
VIN 1
VIN 2
VIN 3
VIN 4
GND
VIN 10
VIN 11
TEST0 TEST1
M61040FP
VIN 12
VREG
VREF
RESET
CK
CS
ANALOG OUT
CIN
5V14V
DI
IDI
ICK
ICK
ICS
A
AA
Circuit 1
PFOUT DFOUT
CFOUT
V
CC
VIN 1
VIN 2
VIN3
VIN 4
GND
VIN 10
VIN 11
M61040FP
TEST0 TEST1
PFOUT DFOUT
CFOUT
V
CC
V
VIN 1
VIN 2
VIN 3
VIN 4
GND
VIN 10
VIN 11
TEST0 TEST1
M61040FP
VIN 12
VREG
VREF
RESET
ANALOG OUT
CIN
Circuit 2
ANALOG OUT
CIN
Circuit 3
Figure 4-1
DI
CK
CS
VIN 12
VREG
VREF
RESET
CK
CS
Ω
1M
V
V
4.7uF
V
↓
DI
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