https://devzone.nordicsemi.com/f/nordic-q-a/5907/dealing-the-dc-dc-in-nrf51822Hello, I have questions about DC/DC setup in nRF51822. Is there any automatic switching between DC/DC enable and disable along with battery voltage except DCDCEN register? That is, DC/DC is automatically disabled as battery voltage goes belowen-USTelligent Community 13Mon, 09 Mar 2015 09:00:47 GMThttps://devzone.nordicsemi.com/thread/20598?ContentTypeID=1Mon, 09 Mar 2015 09:00:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fcafa79c-d74c-4e99-8f18-890a929d2c90Stefan Birnir Sverrisson<p>Hi</p> <ol> <li> <p>If you do not have a softdevice enabled, use the DCDCEN register to enable/disable the DCDC. If you have a softdevice enabled, use the <a href="http://developer.nordicsemi.com/nRF51_SDK/nRF51_SDK_v8.x.x/doc/8.0.0/s110/html/a01073.html#ga34b954aaf40905251036737b716533c8">sd_power_dcdc_mode_set</a> function. Only use the DCDC with S110 softdevice version 8.0.0 and third revision hardware, not any older softdevice. If having older hardware, dont use with softdevice. See further recommendation <a href="https://devzone.nordicsemi.com/question/685/ldo-vs-dcdc-nrf51822/?answer=988#post-id-988">here</a>. You must manually disable the DCDC when supply voltage goes below 2.1V, and enable it when the supply voltage goes up again.</p> </li> <li> <p>In the nRF51 Reference Manual it says: <em>Enabling the DC/DC converter will not turn it on, but set it in a state where it automatically gets turned on when the radio is enabled and goes off again when the radio gets disabled. This is done to avoid wasting power running the DC/DC in between the radio events where current consumption is too low.</em> The automatic operation is done by hardware so it will work with or without softdevice enabled.</p> </li> </ol><div style="clear:both;"></div>