• Output high
• Output low
• ADC input and weak pull-up
• ADC input and weak pull down
Signal from each of the GPIO pins flows through an ADC from within the BQ79631-Q1 much like the VC pins
used to measure the high voltage branches. However, unlike the VC pins, the GPIO pins may be configured to
flow through the main ADC that has a digital low pass filter, or to flow through an AUX ADC that does not have
this LPF present. If the user intends to make measurements that prioritize low latency over high accuracy, it is
recommended to configure the GPIO pins to use the AUX ADC.
The user may access GPIO1-3 on the connection points near the center of the board and GPIO4-8 on J5
located just above the BQ79631-Q1 device. Only the GPIO4-8 pins on J5 should be used to measure external
thermistor inputs as the GPIO1-3 pins are used to control FET switches throughout the EVM. GPIO4-7 can also
be used as Master SPI pins to control external devices such as EEPROM or Relay/Contactor Driver.
Connectors
18
BQ79631EVM Evaluation Module
SLUUCC3 – FEBRUARY 2021
Copyright © 2021 Texas Instruments Incorporated
