User's Guide
SLVU924B–March 2014–Revised April 2014
bq76920 Evaluation Module User's Guide
The bq76920EVM evaluation module (EVM) is a complete evaluation system for the bq76920, a 3-cell to
5-cell Li-Ion battery analog front end (AFE) integrated circuit. The EVM consists of a bq76920 circuit
module which is used for simple evaluation of the bq76920 functions. The circuit module includes one
bq76920 integrated circuit (IC), sense resistor, power FETs, and all other onboard components necessary
to protect the cells from overcharge, over discharge, short circuit, and overcurrent discharge in a 5-series
cell Li-Ion or Li-Polymer battery pack. The circuit module connects directly across the cells in a battery.
With a compatible interface board and Microsoft
®
Windows
®
based PC graphical user interface (GUI)
software, the user can view the bq76920 registers, adjust protection limits and enable FET control outputs.
Contents
1 Features....................................................................................................................... 2
1.1 Kit Contents.......................................................................................................... 2
1.2 Ordering Information ............................................................................................... 2
1.3 bq76920 Circuit Module Performance Specification Summary ............................................... 3
1.4 Required Equipment................................................................................................ 3
2 bq76920 EVM Quick Start Guide.......................................................................................... 3
2.1 Before You Begin ................................................................................................... 3
2.2 Quick Start........................................................................................................... 4
3 bq76940/bq76930/bq76920 Software .................................................................................... 5
3.1 System Requirements.............................................................................................. 5
3.2 Installing the bq76940/bq76930/bq76920 Software ........................................................... 5
3.3 Interface Adapter.................................................................................................... 5
3.4 Software Operation................................................................................................. 6
4 bq76920 Circuit Module Use.............................................................................................. 11
4.1 Cell Simulator...................................................................................................... 11
4.2 Evaluating with Simulated Current.............................................................................. 11
4.3 Reducing the Cell Count ......................................................................................... 12
4.4 Connecting Cells .................................................................................................. 13
4.5 Connecting to a Host ............................................................................................. 13
4.6 Gauge Circuits..................................................................................................... 13
4.7 Unused Components ............................................................................................. 13
5 bq76920EVM Circuit Module Physical Construction................................................................... 15
5.1 Board Layout....................................................................................................... 15
5.2 Bill of Materials .................................................................................................... 23
6 Related Documents From Texas Instruments.......................................................................... 29
List of Figures
1 EVM Connection for Basic Operation..................................................................................... 5
2 bq76940/bq76930/bq76920 Evaluation Software Display.............................................................. 6
3 Registers View ............................................................................................................... 8
4 I2C Pro View ................................................................................................................. 9
5 Sequence View............................................................................................................. 10
6 Simulating Current Setup.................................................................................................. 12
7 Top Silk Screen............................................................................................................. 15
8 Top Assembly............................................................................................................... 16
Microsoft, Windows are registered trademarks of Microsoft Corporation.
1
SLVU924B–March 2014–Revised April 2014 bq76920 Evaluation Module User's Guide
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