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User's Guide
SLUU656A–October 2011–Revised January 2013
bq27425 EVM: Single-Cell Impedance Track Technology
This evaluation module (EVM) is a complete evaluation system for the bq27425. The EVM includes one
bq27425 circuit module with an integrated current-sense resistor. A separated orderable EV2300 or
EV2400 PC interface board for gas gauge interface along with a PC USB cable, and Windows™-based
PC software is needed when using this EVM. The circuit module includes one bq27425 integrated circuit
and all other onboard components necessary to monitor and predict capacity for a system-side fuel gauge
solution. The circuit module connects directly across the battery pack. With the EV2300 or EV2400
interface board and software, the user can:
• Read the bq27425 data registers
• Program the chipset for different configurations
• Log cycling data for further evaluation
• Evaluate the overall functionality of the bq27425 solution under different charge and discharge
conditions
The latest Windows™ – based PC software can be downloaded from the product folder on the Texas
Instruments Web site.
Contents
1 Features ...................................................................................................................... 2
1.1 Kit Contents ......................................................................................................... 2
1.2 Ordering Information ............................................................................................... 2
2 bq27425-Based Circuit Module ........................................................................................... 3
2.1 Circuit Module Connections ...................................................................................... 3
2.2 Pin Description ..................................................................................................... 3
3 bq27425 Circuit Module Schematic ...................................................................................... 3
3.1 Schematic ........................................................................................................... 3
4 Circuits Module Physical Layout and Bill of Material ................................................................... 3
4.1 Board Layout ....................................................................................................... 3
4.2 Bill of Material ...................................................................................................... 6
4.3 Schematic ........................................................................................................... 6
4.4 bq27425 Circuits Module Performance Specification Summary ............................................. 6
5 EVM Hardware and Software Setup ..................................................................................... 7
5.1 System Requirements ............................................................................................. 7
5.2 Software Installation ............................................................................................... 7
6 Troubleshooting Unexpected Dialog Boxes ............................................................................. 7
7 Hardware Connection ...................................................................................................... 7
7.1 Connecting the bq27425 Circuit Module to a Battery Pack .................................................. 7
7.2 PC Interface Connection .......................................................................................... 8
8 Operation ..................................................................................................................... 8
8.1 Starting the Program .............................................................................................. 8
8.2 Setting Programmable bq27425 Options ....................................................................... 9
9 Calibrate Screen ........................................................................................................... 11
9.1 To Calibrate the bq27425 ....................................................................................... 11
9.2 Coulomb Counter Offset Calibration ........................................................................... 11
9.3 Board Offset Calibration ......................................................................................... 11
9.4 Voltage Calibration ............................................................................................... 11
9.5 Temperature Calibration ......................................................................................... 11
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SLUU656A–October 2011–Revised January 2013 bq27425 EVM: Single-Cell Impedance Track Technology
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