Texas Instruments BQ27620, User Manual, Page: 3 / 15

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bq27620-Based Circuit Module
2 bq27620-Based Circuit Module
The bq27620-based circuit module is a complete and compact example solution of a bq27620 circuit for
battery management. The circuit module incorporates a bq27620 battery gas gauge integrated circuit (IC)
and all other components necessary to accurately predict the capacity of 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 (J2 or J3): PACK+, PACK –
• To the serial communications port (J8): SDA, SCL, and VSS
•
The system load and charger connect across charger and load (J6 and J7): CHARGER
–
/LOAD
–
and
/LOAD+.
• Access to signal outputs (J5): SOC_INT, BAT_LOW and BAT_GD
2.2 Pin Description
Pin Name Description
PACK+ Pack positive terminal
PACK – Pack negative terminal
SDA I2C ™ communication data line
SCL I2C communication clock line
VSS Signal return for communication line, shared with charger and ground
CHG+/LOAD+ High potential of load or charger connection
CHG – /LOAD – Low potential of load or charger connection (system VSS)
BAT_LOW Battery low output
/BAT_GD Battery good output
SOC_INT SOC state interrupts output
3 bq27620 Circuit Module Schematic
3.1 Schematic
The schematic follows the bill of materials in this user's guide.
4 Circuits Module Physical Layout and Bill of Material
This section contains the board layout, bill of materials, and assembly drawings for the bq27620 circuit
module.
4.1 Board Layout
This section shows the printed-circuit board (PCB) layers ( Figure 1 through Figure 4 ), and assembly
drawing for the bq27620 module.
3 SLUU655 – October 2011 bq27620 EVM: Single-Cell Impedance Track Technology
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