https://devzone.nordicsemi.com/f/nordic-q-a/82238/do-i-need-my-ldoI&#39;m using softdevice s140. My power comes from a CR2032 coin cell. My board has a 1.8V LDO (Toshiba TCR3UM) because my temperature sensor is calibrated for 1.8V (TMP112B). I would like to know if I can get rid of the LDO and use the internal LDO insteaden-USTelligent Community 13Tue, 30 Nov 2021 13:40:53 GMThttps://devzone.nordicsemi.com/thread/341320?ContentTypeID=1Tue, 30 Nov 2021 13:40:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:81f0b5f6-0944-4e1f-9c78-d2e1c3519ad3ketiljo<p>Normally, you could connect the battery to VDDH, configure REG0 to 1.8 V and power the temp sensor from VDD. See high voltage mode at<a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/power.html">https://infocenter.nordicsemi.com/topic/ps_nrf52840/power.html</a></p> <p>But as the module seems to have VDDH connected to VDD internally, this functionality is disabled and you must use an external LDO.</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1638279650839v1.png" alt=" " /></p><div style="clear:both;"></div>