https://devzone.nordicsemi.com/f/nordic-q-a/116616/nrf52840-1-8v-programmerHello, we are developing our first predict with the Nrf52840 running with VDD at 1.8V(default option). so far we have always programmed and debugged NRF52 devices using nRF52832 DK. My understanding is that the 52832 DK is only able to program 3Ven-USTelligent Community 13Fri, 22 Nov 2024 12:11:17 GMThttps://devzone.nordicsemi.com/thread/511642?ContentTypeID=1Fri, 22 Nov 2024 12:11:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3c44b98a-6f3a-4b9d-be7f-30d4a4c11455Vidar Berg<p>Hello,</p> <p>The development kits do not include a built-in level shifter for the debug output, unlike standalone Segger debuggers. Therefore, the 3V I/O voltage on the nRF52 DK must match the target device. On the nRF52840 DK, it is possible to use an external power source to set the I/O voltage to 1.8V:&nbsp;<a href="https://docs.nordicsemi.com/bundle/ug_nrf52840_dk/page/UG/dk/hw_debug_out.html">https://docs.nordicsemi.com/bundle/ug_nrf52840_dk/page/UG/dk/hw_debug_out.html</a>&nbsp;</p><div style="clear:both;"></div>