https://devzone.nordicsemi.com/f/nordic-q-a/46914/nrf52-after-saadc-system-just-won-t-go-to-sleepHi, I have the simplest of SAADC sampling scenarios whereby I&#39;m sampling a voltage in a one-off manner, nrf_drv_saadc_init, nrf_drv_saadc_channel_init, nrf_drv_saadc_sample_convert, and then nrf_drv_saadc_abort and nrf_drv_saadc_uninit, but the systemen-USTelligent Community 13Thu, 09 May 2019 18:52:44 GMThttps://devzone.nordicsemi.com/thread/186264?ContentTypeID=1Thu, 09 May 2019 18:52:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e177e524-b22e-4a06-8b0b-40354d340ed4GJSea<p>Perfect,&nbsp;<span>nrf_pwr_mgmt_run() solved the issue!! Thanks!</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/185458?ContentTypeID=1Mon, 06 May 2019 11:41:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:87a8e97c-0631-4b0f-a5ae-c19869c38db7Kenneth<p>What if you comment out:</p> <p><pre class="ui-code" data-mode="c_cpp"> if (ret_code == NRF_SUCCESS) { m_milliVolts = (uint16_t)((float) adcValue * VBAT_MV_PER_LSB * VBAT_DIVIDER_COMP); m_percentage = VoltToPercent(m_milliVolts); NRF_LOG_INFO(&quot;MV %d - %dpct&quot;, m_milliVolts, m_percentage); }</pre></p> <p>I was thinking maybe it is the FPU keeping your system awake here, try to include&nbsp;nrf_pwr_mgmt_run() from the SDK examples to handle this (in specific&nbsp;PWR_MGMT_FPU_SLEEP_PREPARE()).</p><div style="clear:both;"></div>