Registers (78h) STATUS_BYTE, (79h) STATUS_WORD, (7Ah) STATUS_VOUT of the PMBus specification describe fault monitoring for PMBus devices. The TPS65400 only supports reporting faults. Fault conditions are set in the corresponding status register and the host or power system manager can poll it. Any bits set in the status register remain set even if the fault condition is removed or corrected. The fault bits in the status register remain set until one of the following occur:

• The device receives a CLEAR_FAULTS command.
• A RESET signal is asserted by either issuing a SOFT_RESET or by asserting/deasserting the CE terminal.
• Bias power is removed from the PMBus device.

Section 8.3.7 describes fault thresholds and specific response behaviors.