Battery Management Studio Software
21
SLVU924D – March 2014 – Revised November 2018
Copyright © 2014–2018, Texas Instruments Incorporated
bq76920 Evaluation Module User's Guide
5.9
Device Control
Features are controlled by commands as described in the bq78350-R1 TRM (
). One of the most
basic for operation as described in the quick start section is the FET enable which is toggled by the
ManufacturerAccess() 0x0022
command. The Manufacturer Access commands may be sent using the
Advanced Comm SMB
view and the
Write Word
button. An example is shown in
. A number of
the common commands are also available in buttons in the Commands view. Using the commands the
gauge may be controlled for test or setup for further evaluation. Refer to the bq78350-R1 TRM for
additional information on the commands.
Figure 16. Advanced Comm SMB View
6
bq76920 Circuit Module Use
The bq76920 circuit module contains the bq76920 IC and related circuitry to demonstrate the features of
the IC. Surface mount FETs are provided for the high current path. A thermistor provides temperature
sensing on the board. Other components provide support for the IC and connections to the board. Basic
operation is described in the
. For details of the circuit, refer to the
section.
6.1
Cell Simulator
The EVM includes a resistive cell simulator made up of 200-
Ω
series resistors. The top section of the S3
switch connects the BATT+ node to the top of the resistor string. The bottom of the resistor string is
connected to BATT–. The individual cell taps are connected to the cell monitor signals by other sections of
the dip switch. When operating with a power supply all switch sections should be closed. When operating
with cells, all the dip switch sections should be open to prevent loading the cells and discharging the
battery. The cell simulator resistors are located on the bottom of the board and may become warm during
operation. The orange LED near the dip switch indicates the cell simulator has power either from the
BATT+ or cell inputs.