https://devzone.nordicsemi.com/f/nordic-q-a/1523/question-about-adc-power-consumptionHello, I am trying to develop a low power application by using nrf51822 EK board. In &quot; Reference manual v2.0, 11.1.3 System ON mode &quot;, it says there is a mechanisms can automatically switch on and off the appropriate power sources depending on howen-USTelligent Community 13Thu, 06 Feb 2014 08:18:30 GMThttps://devzone.nordicsemi.com/thread/6761?ContentTypeID=1Thu, 06 Feb 2014 08:18:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0c1d5c77-2fe1-45cb-abef-8bd791b41246Scarlet<p>Thanks Ole!! I will modify my code to use RTC!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/6760?ContentTypeID=1Wed, 05 Feb 2014 11:25:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:334486a1-cd1e-4ed0-8862-ddae34df606dOle Morten<p>Any peripheral is enabled and powered on from you enable it (typically through an ENABLE register or a START task) until you disable it (typically by writing a disable value to ENABLE or triggering a STOP task). As for the ADC in particular, it will be enabled from you write the enable value, 1, to the ENABLE register until you write the disable value, 0, to it</p> <p>You may have use in taking a look at <a href="https://devzone.nordicsemi.com/index.php/what-is-the-power-and-clock-model-of-peripheral-in-nrf51">this question</a>.</p> <p>Also, beware that TIMER2 requires the 16 MHz clock running, and will hence consume ~1 mA of current. If you want a low-power timer, you should use the RTC. Take a look at section 8.3 of the PS to see which peripherals needs which blocks.</p><div style="clear:both;"></div>