https://devzone.nordicsemi.com/f/nordic-q-a/125607/debug-a-1v8-custom-pcb-with-nrf5340-dkHi guys, I have made a custom PCB based on the nRF5340 and for debugging it I have only added a SWD interface. The problem is that this PCB works with 1V8, and in the tech support of the nRF534o DK you say that the voltage on the external board musten-USTelligent Community 13Thu, 13 Nov 2025 20:23:39 GMThttps://devzone.nordicsemi.com/thread/554307?ContentTypeID=1Thu, 13 Nov 2025 20:23:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4f611d13-d529-4df2-b869-e4df8f279db0JONATHAN LL<p>If nothing on the target board(custom PCB) will take damage from operating at 3V then I would just power the board directly from the nRF5340DK.&nbsp;<br />That is the simplest solution that guarantee successful programming.&nbsp;&nbsp;<br /><br />You can try to program the custom board without matching the voltage and it might still work. The main issue here is that the logic high/low state might not be triggered properly if there is a voltage difference.&nbsp;&nbsp;<br /><br /><br />Regards,<br />Jonathan</p><div style="clear:both;"></div>