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9.6 Pack Current Calibration ........................................................................................ 11

10 Related Documentation from Texas Instruments ..................................................................... 12

List of Figures

1 bq27425EVM Layout – Top Silk .......................................................................................... 4

2 bq27425EVM Layout – Top Assembly ................................................................................... 4

3 bq27425EVM Layout – Top Layer ........................................................................................ 5

4 bq27425EVM Layout – Bottom Layer .................................................................................... 5

5 bq27425EVM Schematic................................................................................................... 6

6 bq27425 Circuit Module Connection to Pack and System Load/Charger ........................................... 8

7 DataRAM Screen ........................................................................................................... 9

8 Data Flash Screen ........................................................................................................ 10

9 Calibration Screen......................................................................................................... 12

List of Tables

1 Ordering Information........................................................................................................ 2

2 Bill of Materials .............................................................................................................. 6

3 Performance Specification Summary..................................................................................... 7

4 Circuit Module to EV2300/EV2400 Connections........................................................................ 8

1 Features

• Complete evaluation system for the bq27425 gas gauge with Impedance Track™ technology

• Populated circuit module for quick setup

• Personal computer (PC) software and interface board for easy evaluation

• Software that allows data logging for system analysis

• Ability to upgrade to the latest firmware version by flash reprogramming

1.1 Kit Contents

• bq27425 circuit module (PWR040)

This EVM is used for the evaluation of bq27425. Ensure that you visit the product Web folder at

www.ti.com to properly configure the bq27425 to be evaluated.

1.2 Ordering Information

Table 1. Ordering Information

Part Number EVM Part Number Firmware Version

(1)

Chemistry Chemistry ID

(2)

Configuration

BQ27425-G1 BQ27425EVM v2.02 (0x0202) 4.2 V Li-ion 128 1 cell

BQ27425-G2A BQ27425EVM-G2A v2.05 (0x0205) 4.2 V Li-ion 128 1 cell

BQ27425-G2B BQ27425EVM-G2B v2.05 (0x0205) 4.3/4.35 V Li-ion 312 1 cell

(1)

Using the FW_VERSION (0x0002) Control() Subcommand will help to differentiate between the BQ27425-G1 (will return 0x0202

for firmware version v2.02) and the BQ27425-G2x (will return 0x0205 for firmware version v2.05). See the BQ27425-Gx data

sheet for information on Control() Subcommands.

(2)

Using the CHEM_ID (0x0008) Control() Subcommand will help to differentiate between the BQ27425-G2A (will return 0x0128)

and the BQ27425-G2B (will return 0x0312). Please refer to the BQ27425-G2 data sheet for information on Control()

Subcommands.

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

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