https://devzone.nordicsemi.com/f/nordic-q-a/70109/supply-nrf52840-with-5v-battery-supplyHi. I am looking to implement a nRF52840 chip in my 5v battery operated door lock. Sorry if this is asked before or should be clear from documentation, but I am not completely sure about the operating procedure. Door locks and unlocks by pullingen-USTelligent Community 13Tue, 05 Jan 2021 12:21:53 GMThttps://devzone.nordicsemi.com/thread/287504?ContentTypeID=1Tue, 05 Jan 2021 12:21:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:58487aec-d8b4-4256-b23b-b946052bd897ketiljo<p>The procedure is correct, except that all GPIOs will be referred to VDD or REGOUT0. You can set this to max 3.6 V.</p> <p>Refer to this schematic:&nbsp;<a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/ref_circuitry.html#unique_1073517861">https://infocenter.nordicsemi.com/topic/ps_nrf52840/ref_circuitry.html#unique_1073517861</a></p> <p></p><div style="clear:both;"></div>