SLDS234B December 2017 – September 2018 TPS65218D0
UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA.
The power-fail comparator notifies the system host if the system supply voltage drops and the system is at risk of shutting down. The comparator has an internal 800-mV threshold and the trip-point is adjusted by an external resistor divider.
By default, the power-fail comparator has no impact on any of the power rails or load switches. Load switches are configured individually, to be disabled when the PFI comparator trips to shed system load and extend hold-up time as described in Section 18.104.22.168. The power-fail comparator also triggers the power-down sequencer, such that all or selective rails power down when the system voltage fails. To tie the power-fail comparator into the power-down sequence, the OFFnPFO bit in the CONTROL register must be set to 1.
The power-fail comparator cannot be monitored by software, such that no interrupt or status bit is associated to this function.