ZHCS688I November 2011 – March 2018 TPS65217
PRODUCTION DATA.
The TPS65217x device has an active-low PB_IN input pin that is typically connected to ground through a push-button switch. The PB_IN input has a 50-ms deglitch time and an internal pull-up resistor that is connected to an always-on supply. The always-on supply is an unregulated internal power rail that is functionally equivalent to the power path. The source of the always-on supply is the same as the source of the SYS pin. The push-button monitor has two functions. The first is to power-up the device from the OFF or SLEEP state when a falling edge is detected on the PB_IN pin. The second is to power cycle the device when the PB_IN pin is held low for more than 8 s.
For a description of each function, see the Device Functional Modes section. A change in push-button status (the PB_IN pin goes from high to low or low to high) is signaled to the host through the PBI interrupt bit in the INT register. The current status of the interrupt can be checked by reading the PB status bit in the STATUS register. Figure 8 shows a timing diagram for the push-button monitor.