https://devzone.nordicsemi.com/f/nordic-q-a/56160/vdd-on-the-nrf52840-dkIn the nRF52840-DK, what is the rationale behind Vdd being kept 3.00 VDC , where the overall current would have been lower with 3.3 VDC.en-USTelligent Community 13Mon, 06 Jan 2020 12:51:26 GMThttps://devzone.nordicsemi.com/thread/227664?ContentTypeID=1Mon, 06 Jan 2020 12:51:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9a412262-da36-417f-9002-7b5a5a3fd9d0Stian R&#248;ed Hafskjold<p>Hi, I would guess it&#39;s because the nominal voltage when using the coin cell battery is 3V.</p> <p>Even though the current will be lower with 3.3V using the DCDC regulator, the power will be the same. And if the LDO regulator is used the current will be the same and the overall power increases with higher voltage. The DK itself is not designed to be a low power device. You can power the chip directly from an external source if you want to measure the current with other voltages than 3V.</p><div style="clear:both;"></div>