SLVSCO4D July 2015 – February 2019 TPS65917-Q1
The TPS65917-Q1 device can be configured to detect and wake up from a first supply-detection (FSD) event.
When an automatic start from an FSD event is enabled, the PMIC powers up automatically when a supply is inserted, without waiting for a PWRON button press or other start-up event. An FSD event is detected when the VCCA pin voltage increases above the VSYS_LO threshold. Transition to ACTIVE state requires that the VCC_SENSE voltage increases above the VSYS_HI voltage.
The FSD feature is enabled through unmasking the corresponding interrupt. This event triggers the interrupt, FSD, to the interrupt (INT) line. When an FSD interrupt occurs, the source can be determined using the FSD_STATUS bit in the PMU_SECONDARY_INT register. An interrupt from an FSD event, if not masked, is a wake-up event. Interrupt masking is pre-programmed in the one time programmable memory (OTP) of the device. Any HWRST event sets the interrupt mask bits to the default (OTP) value. The FSD event can also be masked through the PMU_SECONDARY_INT register by setting the FSD_MASK bit.