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User's Guide
SLUU368–February 2011
bq77910EVM
The bq77910EVM-001 evaluation module (EVM) is a complete evaluation system for the bq77910, a four-
to ten-cell Li-ion battery protection integrated circuit. The EVM consists of a bq77910 circuit module and a
resistor cell simulator module which can be used for simple evaluation of the bq77910 functions. The
circuit module includes one bq77910 integrated circuit (IC), sense resistor, power FETs and all other
onboard components necessary to protect the cells from overcharge, over discharge, short circuit, and
over current discharge in a 10 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 Windows™-based PC
software, the user can view the bq77910 registers and program the IC configuration and protection limits.
Contents
1 Features ...................................................................................................................... 3
1.1 Kit Contents ......................................................................................................... 3
1.2 Required equipment ............................................................................................... 3
2 bq77910 Circuit Module and Interfaces .................................................................................. 3
2.1 Circuit Module Connections ...................................................................................... 3
2.2 Signal Descriptions ................................................................................................ 4
3 bq77910 EVM Hardware Connection and Operation .................................................................. 6
3.1 Initial Considerations .............................................................................................. 6
3.2 Connecting the cell simulator ..................................................................................... 6
3.3 Simulated battery connection ..................................................................................... 6
3.4 Pack Connections .................................................................................................. 6
3.5 Basic Operation .................................................................................................... 8
3.6 Cell Connections ................................................................................................... 8
4 Software Installation ........................................................................................................ 9
4.1 System Requirements ............................................................................................. 9
4.2 Interface Adapter ................................................................................................... 9
4.3 Install The bq77910GUI Evaluation Software ................................................................ 11
5 Software Operation ........................................................................................................ 11
5.1 Menu commands ................................................................................................. 13
5.2 Working with register values .................................................................................... 16
5.3 Status Section ..................................................................................................... 17
5.4 Basic Operation With Software ................................................................................. 18
5.5 Operation with other interfaces or hosts ....................................................................... 18
6 Related Documents From Texas Instruments ......................................................................... 18
7 bq77910 EVM Circuit Description and Configuration ................................................................. 19
7.1 Battery voltage clamp ............................................................................................ 19
7.2 Device power ...................................................................................................... 19
7.3 Cell Monitor Inputs and Configuration ......................................................................... 19
7.4 Ground Connection ............................................................................................... 22
7.5 Current Sense Connections ..................................................................................... 22
7.6 Filter Capacitors .................................................................................................. 22
7.7 FET circuits ........................................................................................................ 22
7.8 Detection Sensing ................................................................................................ 23
7.9 Output Protection Components ................................................................................. 23
7.10 Reserved pins ..................................................................................................... 23
7.11 Flag Outputs ...................................................................................................... 23
Windows is a trademark of Microsoft Corporation.
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SLUU368–February 2011 bq77910EVM
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