SLVSB64I November 2011 – March 2018 TPS65217
The TPS65217x device can be reset by either pulling the nRESET pin low or by holding the PB_IN pin low for more than 8 s. All rails are shut down by the sequencer and all register values are reset to their default values. Rails not controlled by the sequencer are shut down after the power-down sequencer is complete. The device stays in the this state for as long as the reset pin is held low, and the nRESET pin must be high for the device to go from the RESET state. However, the device stays in the RESET state for a minimum of 1 s before going back to the ACTIVE state. As detailed in the description of the ACTIVE State, the PWR_EN pin must be asserted within 5 s of the nWAKEUP pin going low for the device to go to the ACTIVE state. The RESET function power-cycles the device and only shuts down the output rails temporarily. Resetting the device does put the device in the OFF state.
If the PB_IN pin is kept low for an extended amount of time, the device continues to cycle between the ACTIVE and RESET states, and goes to the RESET state after each 8-s time period.