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User's Guide
SLUU320C – January 2009 – Revised June 2009
bq20z40EVM-001 SBS 1.1 Impedance Track™Technology
Enabled Battery Management Solution EVM
This EVM is a complete evaluation system for the bq20z40/bq29330/bq29412 battery management
system. The EVM includes one bq20z40/bq29330/bq29412 circuit module, a current sense resistor, two
thermistors, and a link to Windows™-based PC software. The circuit module includes one bq20z40 IC,
one bq29330 IC, one bq29412 IC, and all other onboard components necessary to monitor and predict
capacity, perform cell balancing, monitor critical parameters, protect the cells from overcharge,
overdischarge, short circuit, and overcurrent in 2-, 3- or 4-series cell Li-ion or Li-polymer battery packs.
The circuit module connects directly across the cells in a battery. With the EV2300 interface board and
software, the user can read the bq20z40 data registers, program the chipset for different pack
configurations, log cycling data for further evaluation, and evaluate the overall functionality of the
bq20z40/bq29330/bq29412 solution under different charge and discharge conditions.
Contents
1 Features ....................................................................................................................... 2
2 bq20z40/bq29330-Based Circuit Module ................................................................................. 2
3 bq20z40/bq29330 Circuit Module Schematic ............................................................................ 3
4 Circuit Module Physical Layouts and Bill of Materials .................................................................. 3
5 EVM Hardware and Software Setup ...................................................................................... 8
6 Troubleshooting Unexpected Dialog Boxes .............................................................................. 8
7 Hardware Connection ....................................................................................................... 8
8 Operation .................................................................................................................... 10
9 Calibration Screen.......................................................................................................... 13
10 Pro (Advanced) Screen .................................................................................................... 15
11 Related Documentation from Texas Instruments ...................................................................... 16
List of Figures
1 bq20z40EVM-001 Layout (Silk Screen) .................................................................................. 4
2 Top Assembly ................................................................................................................ 4
3 Top Layer ..................................................................................................................... 4
4 Bottom Layer ................................................................................................................. 5
5 Bottom Assembly ............................................................................................................ 5
6 Schematic ..................................................................................................................... 7
7 bq20z40/bq29330 Circuit Module Connection to Cells and System Load/Charger ................................. 9
8 SBS Data Screen........................................................................................................... 11
9 Data Flash Screen, 1st Level Safety Class ............................................................................. 12
10 Calibration Screen.......................................................................................................... 14
11 Pro (Advanced) Screen .................................................................................................... 15
List of Tables
1 Ordering Information ........................................................................................................ 2
2 Bill of Materials ............................................................................................................... 6
3 Performance Specification Summary ..................................................................................... 8
4 Circuit Module to EV2300 Connections ................................................................................... 9
Impedance Track is a trademark of Texas Instruments.
Windows is a trademark of Microsoft Corporation.
SLUU320C – January 2009 – Revised June 2009 bq20z40EVM-001 SBS 1.1 Impedance Track™Technology 1
Enabled Battery Management Solution EVM
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