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1 SLUUA63A – April 2013 – Revised July 2016
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bq27421 EVM: Single-Cell Impedance Track Technology
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User's Guide
SLUUA63A – April 2013 – Revised July 2016
bq27421 EVM: Single-Cell Impedance Track Technology
This evaluation module (EVM) is a complete evaluation system for the bq27421. The EVM includes one
bq27421 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 Microsoft
®
Windows
®
based PC software is needed when using this EVM. The circuit module includes one bq27421 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 bq27421 data registers
• Update the RAM for different configurations
• Log cycling data for further evaluation
• Evaluate the overall functionality of the bq27421 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
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2
1.1 Kit Contents
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2
1.2 Ordering Information
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2 bq27421-Based Circuit Module
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3
2.1 Circuit Module Connections
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2.2 Pin Description
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3 Circuit Module Physical Layout, Bill of Materials and Schematic
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4
3.1 Board Layout
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4
3.2 Bill of Material
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3.3 Schematic
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3.4 bq27421 Circuits Module Performance Specification Summary
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4 EVM Hardware and Software Setup
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4.1 Software Installation
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5 Troubleshooting Unexpected Dialog Boxes
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6 Hardware Connection
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9
6.1 Connecting the bq27421 Circuit Module to a Battery Pack
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9
6.2 PC Interface Connection
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7 Operation
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7.1 Starting the Program
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7.2 Setting Programmable bq27421 Options
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8 Calibration
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13
8.1 Calibrating the bq27421
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8.2 Voltage Calibration
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8.3 Board Offset Calibration
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9 Advanced Communication I
2
C
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14
9.1 I
2
C Communication
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10 Related Documentation from Texas Instruments
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