DC Power Supply
+ -
Install cell
simulator shunts
Position shunts to “EXT”,
omit “PU” if pull-up
provided on MCU
MCU
Evalua
on Board
SDA
SCL
Figure 5-6. Host Connection Concept
5.8 Hardware Configuration
5.8.1 Configuration Jumpers
Certain features on the BQ76922EVM may be configured by jumpers or shunts on headers. See
for
details of the header pins. Not all configurations are compatible with all register settings, the user should set pins
appropriately for the register settings planned. For example pins must not be pulled above REG18 when used as
thermistor inputs. Pull up to REG1 is not acceptable when registers configure a pin as a thermistor input.
CAUTION
Multi-function pins must be connected to compatible signal levels before programming registers to
avoid device damage.
The J16 cell simulator header and J7 I2C configuration are discussed with board connection diagrams.
J4 selects the connection of the DFETOFF and CFETOFF pins. Pins may be pulled low, high to REG1 or
brought to a terminal block for external connection.
J3 selects the connection of TS2. It may be taken to a terminal block for connection of an external wake or
thermistor. It may also be pulled to VSS. The 10k R22 simulates a nominal temperature.
J6 selects the connection of ALERT. It may be connected to a terminal block for external connection, to the
on-board interface for HDQ, or pulled up to REG1 or down to VSS.
5.8.2 Unused Components
The EVM contains a number of component patterns which may be useful for evaluation. Unpopulated headers
at the MCU may provide future signal access. Parallel FET configuration is possible by changing the component
population in the FET area. See the FET schematic page
.
5.9 Configuration Register Programming
Configuration register programming should be 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
BQ76922EVM Circuit Module Use
18
BQ76922EVM Evaluation Module
SLVU957A – SEPTEMBER 2019 – REVISED NOVEMBER 2021
Copyright © 2021 Texas Instruments Incorporated