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BQ27541 Datasheet, PDF (2/38 Pages) Texas Instruments – Single Cell Li-Ion Battery Fuel Gauge for Battery Pack Integration
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bq27541
SLUS861 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
DEVICE INFORMATION
AVAILABLE OPTIONS
PART NUMBER
PACKAGE
bq27541DRZR
bq27541DRZT
12-pin, 2,5-mm × 4-mm SON
(1) bq27541 is shipped in I2C mode
TA
–40°C to 85°C
bq27541
(TOP VIEW)
COMMUNICATION
FORMAT
I2C, HDQ(1)
SE 1
REG25 2
REGIN 3
BAT 4
Vcc 5
Vss 6
12 HDQ
11 SCL
10 SDA
9 TS
8 SRN
7 SRP
TAPE and REEL
QUANTITY
3000
250
TERMINAL FUNCTIONS
TERMINAL
NAME
NO.
BAT
4
REG25
2
REGIN
3
SCL
11
SDA
10
SE
1
HDQ
12
SRN
8
SRP
7
TS
9
Vcc
5
Vss
6
TYPE (1)
I
P
P
I
I/O
O
I/O
IA
IA
IA
P
P
DESCRIPTION
Cell-voltage measurement input. ADC input. Decouple with 0.1µF capacitor.
2.5V output voltage of the internal integrated LDO. Connect a minimum 0.47µF ceramic capacitor.
The input voltage for the internal integrated LDO. Connect a 0.1µF ceramic capacitor.
Slave I2C serial communications clock input line for communication with system (Slave). Use with 10 kΩ
pull-up resistor (typical).
Slave I2C serial communications data line for communication with system (Slave). Open-drain I/O. Use
with 10 kΩ pull-up resistor (typical).
Shutdown Enable output. Open-drain.
HDQ serial communications line (Slave). Open-drain.
Analog input pin connected to the internal coulomb counter where SRN is nearest the PACK- connection.
Connect to 5-mΩ to 20-mΩ sense resistor.
Analog input pin connected to the internal coulomb counter where SRP is nearest the CELL- connection.
Connect to 5-mΩ to 20-mΩ sense resistor
Pack thermistor voltage sense (use 103AT-type thermistor). ADC input
Processor power input. The minimum 0.47µF capacitor connected to REG25 should be close to Vcc.
Device ground
(1) I/O = Digital input/output, IA = Analog input, P = Power connection
2
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