https://devzone.nordicsemi.com/f/nordic-q-a/49700/how-to-disable-power-on-devkit-s-nrf52-when-programming-external-boardDue to some problems with VTG and GND detect I sometimes program an on devkit nRF52 instead of my external board and that causes lost time, because it&#39;s not straightforward to detect. Is there a way to disable devkit&#39;s nRF52 and use only PCA10040 to programen-USTelligent Community 13Wed, 15 Jul 2020 07:08:23 GMThttps://devzone.nordicsemi.com/thread/260041?ContentTypeID=1Wed, 15 Jul 2020 07:08:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e754d860-3bb6-48da-b757-7d9837c5d11fJared<p>Hi.</p> <p>No,T he interface chip can only be separated from the rest of the power domain by switch 6 which puts the board in nRF only mode, this disconnects the interface chip from the power domain and therefore makes it unusable for debugging external DUTs.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/259829?ContentTypeID=1Tue, 14 Jul 2020 08:35:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c451158e-0e2f-4476-b43b-9903b0e3b5a6rico<p>Facing a similar issue. It can be quite annoying to be not sure about wheather or not the external board is programmed.</p> <p>So you say there is no option?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/198203?ContentTypeID=1Fri, 12 Jul 2019 13:50:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e9d163da-db93-4bb3-aabd-9315655248f9Jared<p>Hi,</p> <p>I&#39;m not sure if disabling the nRF52 would solve the problem as the Interface IC&nbsp;could possibly face some issues when it tries to program the nRF52 when VTG and GND isn&#39;t detected properly. I would instead recommend fixing the issue with VTG and GND instead.&nbsp;</p> <p>regards</p> <p>Jared&nbsp;</p><div style="clear:both;"></div>