https://devzone.nordicsemi.com/f/nordic-q-a/6868/how-much-consume-nrf51822-in-low-power-datasheet-and-mesure-are-not-the-sameHello, what do I need to pay attention to calculate the consumption of nrf51822 in low power mode (sleep). I make this simple program : =================================== enable Low frequency quartz =&gt; Ix32k = max 1uA enable watchdog en-USTelligent Community 13Wed, 06 May 2015 12:21:29 GMThttps://devzone.nordicsemi.com/thread/24203?ContentTypeID=1Wed, 06 May 2015 12:21:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:83dba30f-6123-443e-a416-6c4b70750ff7Stefan Birnir Sverrisson<p>Hi</p> <p>The expected current consumption is actually System_On_mode + LFCLK_crystal_WDT = 2.6 + 0.4 + 0.1 = 3.1uA, so your observed current consumption of your specific nRF51 chip is surprisingly low. The chip remains in System_On low power mode when you call __WFI.</p> <p>More information on current consumption is given in the <a href="https://devzone.nordicsemi.com/question/5186/how-to-minimize-current-consumption-for-ble-application-on-nrf51822/#reply-5187">current consumption guide</a>.</p><div style="clear:both;"></div>