SLUSE14A December 2020 – February 2021 BQ76942
The BQ76942 device includes two pins (CFETOFF and DFETOFF) that can be used to disable the protection FET drivers quickly, without going through the host serial communications interface. When the selected pin is asserted, the device disables the respective protection FET.
The CFETOFF pin can be used optionally to disable the CHG and PCHG FETs, and the DFETOFF pin can be used optionally to disable the DSG and PDSG FETs. The device also includes the option to configure the DFETOFF pin as BOTHOFF functionality, such that if that pin is asserted, the CHG, PCHG, DSG, and PDSG FETs will be disabled. This allows the CFETOFF pin to be used for an additional thermistor in the system, while still providing pin control to disable the FETs.
The CFETOFF or BOTHOFF functionality disables both the CHG FET and the PCHG FET when asserted.
The DFETOFF or BOTHOFF functionality disables both the DSG FET and the PDSG FET when asserted.