https://devzone.nordicsemi.com/f/nordic-q-a/52960/oscillators-regarding-consumption-and-wake-up-timeHi, I have questions regarding consumption. Especially regarding the Quartz oscillator. I have read stabilisation is up to 0.4ms (very long). There is also the internal RC oscillator that is much quicker : 3us The problem is I am using Softdevice, withen-USTelligent Community 13Mon, 07 Oct 2019 16:44:05 GMThttps://devzone.nordicsemi.com/thread/213732?ContentTypeID=1Mon, 07 Oct 2019 16:44:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0534f6f9-f9f7-4f25-9f78-e87af2d407abSalmat<p>Hi,</p> <p>Sorry I am only talking of hfclk !</p> <p>But I have my response, I tested with oscilloscope on some ble examples, and Quartz is only used when requested by nrf_drv_clock_hfclk_request</p> <p>The normal execution is on internal oscillator, so it is perfect for me !</p> <p>Regards,</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/213658?ContentTypeID=1Mon, 07 Oct 2019 12:45:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3e535627-5f91-4716-bafa-09f8e3d7ae60Simonr<p>Hi Matthieu</p> <p>You can see the electrical specifications of the RC oscillator (LFRC) and the crystal oscillator (LFXO) in the <a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Fclock.html&amp;cp=3_1_0_18_3_2&amp;anchor=unique_937965404">product specifications here</a>. The crystal oscillator is by far the most energy-efficient, as it has a lower run current, it doesn&#39;t have to calibrate as the RC does, and it has a lower PPM. The start-up time does not have too much to say, as the LF clock will run as long as the SoftDevice is active anyway.&nbsp;</p> <p>The SoftDevice will start up the LF clock when it is activated, that&#39;s not optional I&#39;m afraid, so you&#39;ll have to use the LF clock in order to use BLE on the chip.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>