https://devzone.nordicsemi.com/f/nordic-q-a/89302/hfxo-external-crystal-pin-inputsHello, I see that there is an option for the HFXO external oscillator, but I do not see any place that lists which pins to connect a crystal to. Is this HFXO (and the LFXO) internal to the device, or are there pins which need a crystal connected? en-USTelligent Community 13Thu, 23 Jun 2022 21:19:38 GMThttps://devzone.nordicsemi.com/thread/374033?ContentTypeID=1Thu, 23 Jun 2022 21:19:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:99edf286-9a22-4388-a951-b1ebe77d8a04Jay Tyzzer<p>Hello Jordan,</p> <p>The nRF9160 <strong>Module</strong> has both HFXO and LFXO crystals under the hood which are attached to the internal SoC.&nbsp; The SoC has an internal LF RC oscillator.&nbsp; Please review PS v2.1, section 5.4, Clock management that describes the use of both. The LFCLK sources may be switched on the fly.&nbsp;Note that the LTE modem must use the LFXO as the LFCLK source. (PS v2.1, Section 5.4.2).&nbsp;&nbsp;</p> <p>Hope this helped.&nbsp;</p> <p>Br,</p> <p>Jay</p><div style="clear:both;"></div>