SLUSE14A December 2020 – February 2021 BQ76942
The BQ76942 device includes two multifunction pins, DDSG and DCHG, which can be configured as logic-level outputs to provide a fault-related signal to a host processor or external circuitry (that is, DDSG and DCHG functionality), as a thermistor input, a general purpose ADC input, or a general purpose digital output.
When used as digital outputs, the pins can be configured to drive an active high output, with the output voltage driven from either the REG18 1.8-V LDO or the REG1 LDO (which can be programmed from 1.8 V to 5.0 V).
When the pins are configured for DDSG and DCHG functionality, they provide signals related to protection faults that (on the DCHG pin) would normally cause the CHG driver to be disabled or (on the DDSG pin) would normally cause the DSG driver to be disabled. These signals can be used to control external protection circuitry, if the integrated high-side NFET drivers will not be used in the system. They can also be used as interrupts in manual FET control mode for the host processor to decide whether to disable the FETs through commands or using the CFETOFF and DFETOFF pins.