SLUSDQ4 April 2019 BQ79606A-Q1
The BQ79606A-Q1 integrates an open-drain output (NFAULT) to signal the host processor that a fault has occurred in the battery pack. The NFAULT output is enabled when the COMM_CTRL[NFAULT_EN] bit is set. When the BQ79606A-Q1 detects an unmasked fault, receives a fault tone on the FAULT* interface, or the heartbeat from the device above stops (see Daisy-Chain FAULT* Interface (Stack Devices) for heartbeat details), NFAULT asserts low to signal the fault to the host. It is the responsibility of the host to read the stack of devices to determine where the fault occurred. If the FAULT* interface is not enabled, it is the responsibility of the host to poll the status of the stack devices to monitor for faults. The NFAULT output only indicates faults in the base device for this condition.