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bq27421-Based Circuit Module
The bq27421-based circuit module is a complete and compact example solution of a bq27421 circuit for
battery management. The circuit module incorporates a bq27421 battery gas gauge integrated circuit (IC)
with integrated sense resistor and all other components necessary to accurately predict the capacity of a
1-series Li-ion cell.
2.1
Circuit Module Connections
Contacts on the circuit module provide the following connections:
•
Direct connection to the battery pack (J5): PACK+, PACK–
•
To the serial communications port (J10): SDA, SCL, and VSS
•
The system load and charger connect across charger and load (J6 and J7): CHARGER+/LOAD+ and
CHARGER–/LOAD–.
•
Access to signal outputs (J1 and J5): BIN and GPOUT
•
External connect to power the IC (J4): EXT VDD and VSS
2.2
Pin Description
Pin Name
PACK+
PACK–
SDA
EXT VDD
SCL
VSS
CHARGER+/LOAD+
CHARGER–/LOAD–
BIN
GPOUT
SLUUA63A – April 2013 – Revised July 2016
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Description
Pack positive terminal
Pack negative terminal
2
I
C communication data line
External supply connection
2
I
C communication clock line
Signal return for communication line, shared with charger and ground
High potential of load or charger connection
Low potential of load or charger connection (system VSS)
Battery insertion detection input
General purpose output
Copyright © 2013–2016, Texas Instruments Incorporated
bq27421-Based Circuit Module
bq27421 EVM: Single-Cell Impedance Track Technology
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