https://devzone.nordicsemi.com/f/nordic-q-a/69937/nrf52840-isp1807-not-resetting-during-powerupI&#39;m having some issues with a design I&#39;m developing using the ISP1807 bluetooth SOC (contains nRF52840). Every time I apply power to my device I have to manually reset the MCU by shorting nRESET to ground. I tried adding a POR IC (TPS3831) that holdsen-USTelligent Community 13Tue, 29 Dec 2020 14:18:14 GMThttps://devzone.nordicsemi.com/thread/286861?ContentTypeID=1Tue, 29 Dec 2020 14:18:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5bc2ca14-1688-4ed2-97dd-f4e90314a9f4Kenneth<p>Have anyone at Nordic reviewed your schematic and layout? Do you see this also when using the nRF52840-DK?</p> <p>Have you tried adding some debugging (e.g. UART) to check if the problem may be related to an assert?</p> <p>Are you sure you are doing a complete power cycle, and that there are no residue voltage on the board that may be feeding the nRF52840 through a GPIO?</p><div style="clear:both;"></div>