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2.3.7 Connecting to a Host
After initial operation of the monitor with the BQStudio software, consider operating the board connected to and
controlled by a microcontroller board. To do this, unpopulate J6 and J2, and populate J1 and J5. J6 and J2
disconnect the I2C lines of the BQ76905 from the on-board MCU. J1 and J5 connect the I2C pullup resistors to
REGOUT.
2.3.8 Hardware Configuration
2.3.8.1 Configuration Jumpers
Certain features on the BQ76905EVM can be configured by jumpers or shunts on headers. See
details of the header pins.
J1 and J5 connect the BQ76905 I2C lines to pull-up resistors at REGOUT for off-board MCU communications.
J2 and J6 connect the I2C lines of the BQ76905 to the on-board MCU.
J7 connects the ALERT pin to a pull-up resistor at REGOUT.
J8 connects/disconnects the on-board thermistor from the TS pin.
J10 cell simulator connections.
The cell simulator headers and are discussed in board connection diagrams.
2.3.9 Configuration Register Programming
Configuration register programming is done once hardware configuration is set with jumpers. Configuration
registers are set in the Data Memory screen and are different from the status registers displayed in the Registers
screen. See the BQ76905 data sheet (SLUSF45) and supporting documentation for register information. When
a configuration file is available, the file can be imported to set all operational selections at once. However, a
configuration file loaded with Data Memory Import can load as little as 1 parameter, so the user must be familiar
with the contents of imported files. With a new device or after loading a configuration file, individual register
changes can be made. Configuration register programming typically involves the following general principles
selected in various register names:
1. Selection of the protection features to be enabled
2. Selection of the protection thresholds for the enabled features
3. Setting the FET control options
4. Exporting (saving) the configuration register file for future use
SLUUCY9 – NOVEMBER 2023
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DC Power Supply
+ -
Install cell
simulator shunts
Figure 2-6. Host Connection Concept
Copyright © 2023 Texas Instruments Incorporated
MCU
Evaluation Board
SCL
SDA
Add shunts for
Remove shunts
pull-ups if pull-
for on-board MCU
ups not provided
connection
on MCU board
Section 5.1
BQ76905 Evaluation Module
Hardware
for
9
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