This app note mentions:
About the EN pin and RESET While using the EN pin on the Feather will completely power down the MCU, you must be careful of one special case: If you have externally powered circuits that apply power to GPIOs when EN is LOW, this flow of current back into the MCU from the GPIO can prevent the nRF52 MCU from resetting! To eliminate this problem the AB1805 is configured to also bring nRESET low when in sleep (EN power down) mode. This assures that the MCU will always reset, even if there is leakage current.
I remember seeing other topics where people completely make sure a RESET is done on the Particle device by power cycling the board, that is, removing the power completely with a relay or mostfet.
Here’s my question:
Does connecting EN and RESET with the AB1805 as mentioned above protect the board from these extreme cases where people needed to power cycle the board?
Or do we still need to add a means for the watchdog to power cycle a Particle device with a relay/mosfet?