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bq27425-Based Circuit Module

2 bq27425-Based Circuit Module

The bq27425-based circuit module is a complete and compact example solution of a bq27425 circuit for

battery management. The circuit module incorporates a bq27425 battery gas gauge integrated circuit (IC)

with integrated sense resistor 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 (TB2): PACK+, PACK–

• To the serial communications port (J6): SDA, SCL, and VSS

• The system load and charger connect across charger and load (TB1): CHARGER–/LOAD– and

CHARGER+/LOAD+.

• Access to signal outputs (TB3): BIN, and GPOUT

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)

BIN Battery insertion detection input

GPOUT General purpose output

3 bq27425 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 bq27425 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 bq27425 module.

SLUU656A–October 2011–Revised January 2013 bq27425 EVM: Single-Cell Impedance Track Technology

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