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bq3055 Circuit Module Schematic

2.2 Pin Descriptions

PIN NAME DESCRIPTION

1N –ve connection of first (bottom) cell

1P +ve connection of first (bottom) cell

2P +ve connection of second cell

3P +ve connection of third cell

4P +ve connection of fourth (top) cell

SMBC Serial communication port clock

SMBD Serial communication data port

VSS Pack negative terminal

PACK– Pack negative terminal

SYS PRES System present pin (if low, system is present)

PACK+ Pack positive terminal

3 bq3055 Circuit Module Schematic

This section contains information on the schematic for the bq3055/bq29440 implementation.

3.1 Schematic

The schematic follows the bill of materials in this user's guide.

3.2 Choosing Particular Precharge Mode

The bq3055 contains an internal precharge FET; however, the default firmware configuration uses the

Charge FET for precharge. To evaluate the internal precharge FET, change the least two significant bits in

DF:Configuration:Charging Configuration to be 0,0. See the bq3055 Technical Reference Manual

(SLUU440) for additional information.

3.3 Testing Fuse-Blowing Circuit

To prevent the loss of board functionality during the fuse-blowing test, the actual chemical fuse is not

provided in the circuit. FET Q1 drives TP8 low if a fuse-blow condition occurs; monitoring TP8 can be

used to test this condition.

4 Circuit Module Physical Layouts and Bill of Materials

This section contains the board layout, bill of materials, and assembly drawings for the bq3055/bq29440

circuit module.

4.1 Board Layout

This section shows the dimensions, PCB layers, and assembly drawing for the bq3055 module.

Figure 1. bq3055EVM-001 Layout (Silk Screen)

SLUU824– December 2011 bq3055EVM SBS 1.1 Compliant Advanced Gas Gauge Battery Management

Solution EVM

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