https://devzone.nordicsemi.com/f/nordic-q-a/45678/how-to-wake-from-off-mode-with-a-gpio-pin-on-the-nrf52810I have an nRF52810 on a custom board and can&#39;t get it to wake from System Off mode. The code: trying it with a different way to turn the system off also didn&#39;t work: Both of these methods worked on the PCA10040 HDK, the pin is being driven byen-USTelligent Community 13Fri, 26 Apr 2019 08:38:40 GMThttps://devzone.nordicsemi.com/thread/183989?ContentTypeID=1Fri, 26 Apr 2019 08:38:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d2a89b3d-7da2-4b5c-a71c-781507d09e1aCCD technics<p>Took a little while to figure out because manually triggering the wakeup with a wire&nbsp;didn&#39;t work. In the end the pull-up resistor was too large, switching to a 1.5k resistor did the trick.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/181084?ContentTypeID=1Tue, 09 Apr 2019 13:25:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9d5eac6d-cbbb-449c-aa9f-e5e1df8f245cStian R&#248;ed Hafskjold<p>The code you posted is working, so then there must be something wrong with the hardware on your custom board. Are you able to put a logic analyzer or scope on the line and see if it gets properly pulled to ground? What happens if you manually pull the pin to ground?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/180470?ContentTypeID=1Fri, 05 Apr 2019 10:46:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5e61b1b3-3e20-402b-ba33-04f49cb8039fCCD technics<p>I have a 10k pull-up resistor between the RTC and the nRF52810, that is why it&#39;s in NRF_GPIO_PIN_NOPULL mode. The RTC out pin is floating until it gets pulled low.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/180363?ContentTypeID=1Thu, 04 Apr 2019 15:33:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:29e55c40-4ef9-4bf4-9d47-dbb522b76949Stian R&#248;ed Hafskjold<p>Do you have an external pull up on the pin? how do you connect the external signal?</p><div style="clear:both;"></div>