The TPS929120-Q1 integrates diagnostics for REF resistor open/short fault. If the current output from REF pin I(REF) is lower than I(REF_OPEN_th), the reference resistor open-circuit fault is reported. The reference resistor shortcircuit fault is reported if the voltage of REF pin V(REF) is lower than V(REF_SHORT_th). The device pulls the ERR pin down with constant current sink and set flag registers including FLAG_REF and FLAG_ERR to 1. The master controller must send CLR_FAULT to clear fault flag registers after fault removal.