https://test-devzone.nordicsemi.com/f/nordic-q-a/88573/enabling-saadc-vddhdiv5-measurements-on-nrf5340Hello, I would like to measure battery voltage that is connected to the VDDH pin of an nrf5340 custom board. I understand that this is possible using the nrfx saadc driver, using vddhdiv5 as input to the ADC, but I lack the coding skills to implementen-USTelligent Community 13 Non-ProductionFri, 03 Jun 2022 12:33:41 GMThttps://test-devzone.nordicsemi.com/thread/370881?ContentTypeID=1Fri, 03 Jun 2022 12:33:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a47e774c-c34e-4aa2-b249-d18d70f5959euser14926<p>Hi,</p> <p>There is no nrfx_saadc example in the nRF Connect SDK, but you can start out with the sample created by my colleague in <a href="https://test-devzone.nordicsemi.com/f/nordic-q-a/46716/simple-adc-code/362572#362572">this post</a>. You will need to modify is a bit to work with nRF5340 DK, see <a href="https://test-devzone.nordicsemi.com/f/nordic-q-a/87519/nrfx_saadc---buildconf-error-ppi_chen-dppic_chen/365927#365927">this post</a>. In this sample, you should be able to set the input to VDDH/5 (<a href="https://github.com/NordicSemiconductor/nrfx/blob/v2.8.0/hal/nrf_saadc.h#L73">NRF_SAADC_INPUT_VDDHDIV5</a><span>)</span> in&nbsp;NRFX_SAADC_DEFAULT_CHANNEL_SE() macro.</p> <p>You may also be able to <a href="https://github.com/nrfconnect/sdk-zephyr/blob/v3.0.99-ncs1/samples/boards/nrf/battery/src/battery.c#L144">modify the input</a> in the Zephyr NRFX Battery sample to use the VDDH/5 input (<span>SAADC_CH_PSELP_PSELP_VDDHDIV5)</span>, but I have not tested this.</p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>