https://devzone.nordicsemi.com/f/nordic-q-a/105712/nrf5340-dk-custom-board-flashing-1-8vHi, Is it possible to program (or debug) custom board through P19 connector if there is different 1.8V logic level in nRF5340 in custom board. If yes, how ? Not succeeded so far. Br Vesaen-USTelligent Community 13Fri, 17 Nov 2023 11:15:23 GMThttps://devzone.nordicsemi.com/thread/456132?ContentTypeID=1Fri, 17 Nov 2023 11:15:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:dc7856ed-0f04-4f81-b170-d41eb552e5faVesa Eskola<p>Thank You !<br /><br />This fixed issue, and saved my money<span class="emoticon" data-url="https://devzone.nordicsemi.com/cfs-file/__key/system/emoji/1f44c.svg" title="Ok hand">&#x1f44c;</span><br /><br />Br Vesa</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/456088?ContentTypeID=1Fri, 17 Nov 2023 09:03:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:282f06ee-174f-49b2-80a4-fc40244a51deBendik Heiskel<p>Hi Vesa,</p> <p>Yes, that is possible, but you need to change the VDD voltage of the nRF5340DK to 1.8V. When the USB connector is attached the VDD voltage will be regulated to 3V by default, if you supply 1.8V to the VIO_REF connector you can change the output of the regulator to match your custom board voltage.</p> <p>Another option is to just supply the custom board with 3V from the DK when programming/debugging if your board supports having a higher VDD voltage.</p> <p>&nbsp;</p> <p>Best regards,</p> <p>Bendik</p><div style="clear:both;"></div>