SLUAAQ5 May 2024 BQ769142 , BQ76942 , BQ76952 , BQ76972
The device takes up to 250ms for the device to initialize from SHUTDOWN. Afterwards, the MOSFETs are able to be turned on. In order to turn on manually, users must send a command like ALL_FETS_ON() or deassert CFETOFF and DFETOFF. These updates are evaluated every 250ms to determine if one has occurred. If so, the FETs then are enabled.
To determine the state of the FETs, the devicve provides two alternatives: An MCU can poll the device to figure out if the device is initialized by I2C or SPI or the user can set an interrupt with the ALERT pin which notify the MCU that the device is up and running.