https://devzone.nordicsemi.com/f/nordic-q-a/88511/flashing-and-debugging-an-external-nrf52840-board-with-the-nrf52840-dk-different-to-those-covered-in-forumI have read the other threads regarding this, but doesn&#39;t appear to work. I have noticed on my nRF52840 DK that P20 has a different pinout So I have tried an assortment of connections to this board to the SWDIO,SWDCLK,SWO and VDD. I am unsureen-USTelligent Community 13Tue, 07 Jun 2022 07:24:31 GMThttps://devzone.nordicsemi.com/thread/371041?ContentTypeID=1Tue, 07 Jun 2022 07:24:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f115f9ea-92fb-4a68-b2c9-edf687d2e640Simonr<p>Hi again</p> <p>No, do not connect VIN 3-5V to GND. In this case is a specific picture of how an nRF52840 DK should be connected to an external board when the external board is powered by the DK.</p> <p><a href="https://devzone.nordicsemi.com/f/nordic-q-a/51179/debug-out-port-p20-on-nrf52840-dk-debugging-custom-board/204972#204972">https://devzone.nordicsemi.com/f/nordic-q-a/51179/debug-out-port-p20-on-nrf52840-dk-debugging-custom-board/204972#204972</a>&nbsp;</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/370984?ContentTypeID=1Mon, 06 Jun 2022 07:59:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:78938e32-bfab-472c-9fa3-b738350bd42eDavid Guest<p>Thanks for reply , so just to confirm, on my dev board (that has 4 more pins than your drawing)</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/pastedimage1654502272191v1.png" alt=" " /></p> <p>I will connect VIN 3-5V to GND ?</p> <p></p> <p>Also does the DK board power our pcb or should I still be powering it from a separate supply ?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/370674?ContentTypeID=1Thu, 02 Jun 2022 11:40:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:41995a40-3862-40db-89e2-3a05f7742e37Simonr<p>Hi</p> <p>Yes, P20 on the DKs has had some naming changes (VTG is now called SWD SEL) since the last revision, as we now have an nRF5340&nbsp;as the debugger MCU. What has changed is that GND is used to detect an external board instead of the voltage like on older revisions. However, the board should be okay to connect as before. See picture below for how the setup should look.</p> <p><img alt=" " src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/flash_2D00_custom_2D00_board.JPG" /></p> <p>As for the nRF Connect Programmer app, the device to connect to should still be the nRF52840 DK, but it should detect the external board instead of the onboard one if it is connected correctly, and let you program that one.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/370512?ContentTypeID=1Wed, 01 Jun 2022 16:01:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:033a820b-0a52-4b05-8f59-1a68f30c1219David Guest<p>Just adding a photo of board ident, which differs from the manual PCA10056&nbsp; 3.0.0 2022.11&nbsp; - on label on PCB</p> <p></p> <p></p> <p><img alt=" " src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/pastedimage1654099206790v1.png" /></p> <p></p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/pastedimage1654100252391v1.png" alt=" " /></p> <p>Does this mean its still detecting on-board nRF52840</p><div style="clear:both;"></div>