Abstract: A system-on-chip (SoC) having a switchable power domain capable of being placed in a standby mode during which a power supply of the switchable power domain is gated and having an always-on power domain. The always-on power domain includes an input sampling circuit, and the switchable power domain includes an input/output (IO) circuit configured to, during normal operation, receive data at a corresponding signal pin when an input buffer of the IO circuit is enabled, in which the corresponding signal pin is coupled to the input sampling circuit. The input sampling circuit is configured to, while the switchable power domain is entering the standby mode but before the power supply is gated, provide an override input enable signal to enable the input buffer of the IO circuit, sample an input bit value on the corresponding signal pin, and store the sampled bit value to provide an injection current fault indicator.

Abstract: A system-on-chip (SoC) having a switchable power domain capable of being placed in a standby mode during which a power supply of the switchable power domain is gated and having an always-on power domain. The always-on power domain includes an input sampling circuit, and the switchable power domain includes an input/output (IO) circuit configured to, during normal operation, receive data at a corresponding signal pin when an input buffer of the IO circuit is enabled, in which the corresponding signal pin is coupled to the input sampling circuit. The input sampling circuit is configured to, while the switchable power domain is entering the standby mode but before the power supply is gated, provide an override input enable signal to enable the input buffer of the IO circuit, sample an input bit value on the corresponding signal pin, and store the sampled bit value to provide an injection current fault indicator.

Abstract: A method for regulating a power conditioner output voltage level includes monitoring a first voltage level of a first supply source and a second voltage level of a second supply source and, while the power conditioner is being supplied by the first supply source, controlling a duty-cycle of an output switch of the power conditioner with feedback-based control signals generated based on errors between a target voltage level and samples of the output voltage level obtained at an output voltage sampling frequency. The method also includes, controlling, for a period corresponding to the output voltage sampling frequency, the duty-cycle of the output switch with an estimated control signal. The method also includes, while the power conditioner is being supplied by the second supply source, controlling the duty-cycle of the output switch using the feedback-based control signals.