https://devzone.nordicsemi.com/f/nordic-q-a/55771/how-to-program-the-nrf51dk-only-nrf-ic-board-using-nrf52840-dk-boardHi, We need to program nRF5x IC, so for that we are trying to program in the DK boards. For this we are using nRF52840 dk board and nRF51822 dk board (where nRF51822 IC is isolated from the interfacing MCU). We tried programming using the below connectionen-USTelligent Community 13Mon, 23 Dec 2019 05:00:16 GMThttps://devzone.nordicsemi.com/thread/226698?ContentTypeID=1Mon, 23 Dec 2019 05:00:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a3089fa0-3079-4c1f-92f1-9d2fd920a6f3sharmelaraju<p>Thanks&nbsp;</p> <p>I have tried this method . this is working.</p> <p>Thanks for your support.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/226543?ContentTypeID=1Fri, 20 Dec 2019 11:50:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0fe6b812-df7e-4af5-8d52-fe523fae09dcsharmelaraju<p>Thanks for the reply.</p> <p>Sorry for late reply. we didn&#39;t power up the external board.</p> <p>So we will try and let you know.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/226304?ContentTypeID=1Thu, 19 Dec 2019 09:13:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2104c8ed-a161-4814-9d83-21705cda58beJ&#248;rgen Holmefjord<p>Hi,</p> <p>Is the nRF51 IC powered externally or from the nRF52840 DK? If it is powered externally, is it running at the same supply voltage level as the nRF52840 DK? The on-board J-Link on the DKs does not provide any level shifting features, meaning it will only be possible to program boards running at the same voltage level.</p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>