SNVSB66A July 2018 – October 2021 TPS3431
The SET1 pin can enable and disable the watchdog timer and should be used when disabling the watchdog timer for longer than one watchdog reset cycle. If SET1 is set to GND, the watchdog timer is disabled and WDI is ignored. If the watchdog timer is disabled, drive the WDI pin to either GND or VDD to ensure that there is no increase in IDD. When SET1 is logic high, the watchdog operates normally. The SET1 pin can be changed dynamically; however, if the watchdog is going from disabled to enabled there is a 150 µs setup time where the watchdog does not respond to changes on WDI, as shown in Figure 7-2. Note: disabling using SET1 pin causes a delay defined by the fixed 150-us setup time when enabling again.