https://devzone.nordicsemi.com/f/nordic-q-a/44640/nrf52-dk-use-p20-to-program-an-externally-powered-board-3-3vHi there I have nrf52 DK - PCA10040 which I believe contains nRF52832 IC I have designed a new PCB that contains BT832 (nRF52832) module from Fanstel My board is powered from 4V DC &amp; has on-board voltage regulator of 3.3V for BT832 (nRF52832) en-USTelligent Community 13Tue, 12 Mar 2019 10:07:13 GMThttps://devzone.nordicsemi.com/thread/175589?ContentTypeID=1Tue, 12 Mar 2019 10:07:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ba216fb8-175b-4ea6-9f05-7c1244f5a746Stian R&#248;ed Hafskjold<p>Yes, you can leave the VDD and VDDnRF pins unconnected. These are for powering the nRF52832 on the PCA10040.</p> <p>You can bypass the diode to get the voltage closer to the target voltage, but I think you&#39;re fine without as well. The SWDIO/CLK voltage will be around 2.9V with the diode.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/175382?ContentTypeID=1Mon, 11 Mar 2019 14:20:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9d83aedf-80d8-49b2-bd30-df5e31aabceeengrns<p>Thanks for the feedback.&nbsp;</p> <p>Do I leave <strong>VDD</strong> &amp; <strong>VDDnRF</strong> pins on header <strong>P20 unconnected</strong>? (These are pins 1 &amp; 2 on this header)?</p> <p></p> <p>And I am assuming I would also need to connect a link on <strong>SB10</strong> to bypass the diode?</p> <p></p> <p>Kind Regards</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/175367?ContentTypeID=1Mon, 11 Mar 2019 14:06:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3f4d5e12-1eed-4cfe-8b39-8ba33a400fe3Stian R&#248;ed Hafskjold<p>Hi, you connect it to the VTG pin.</p><div style="clear:both;"></div>