In which cases for higher accurancy the LFXO crystal must be used and must int&#39;s load capacitors have exact 12pF values?https://devzone.nordicsemi.com/f/nordic-q-a/33217/in-which-cases-for-higher-accurancy-the-lfxo-crystal-must-be-used-and-must-int-s-load-capacitors-have-exact-12pf-valuesHi, We develop two BLE projects on NRF51822 and NRF52832 chips. In both chips, for higher accuracy (better than &#177;250ppm) exists the option to connect the LFXO 32kHz crystal to pins P0.00 &amp; p0.01 in NRF52832 chip and to p0.26 &amp; p0.27 in NRF51822 chipen-USTelligent Community 13Tue, 10 Apr 2018 13:01:29 GMTRE: In which cases for higher accurancy the LFXO crystal must be used and must int's load capacitors have exact 12pF values?https://devzone.nordicsemi.com/thread/127624?ContentTypeID=1Tue, 10 Apr 2018 13:01:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8ac38d7a-ab78-4780-b737-95b479ec756dketiljo<p>1. A crystal will have better accuracy than the RC oscillator. This will make it possible to use a narrower receive window because the timing is more accurate. Hence the time the receiver needs to be on is shorter and the average current draw is less.&nbsp;</p> <p>2. The value of the load capacitors depends on the CL value of the crystal. The pin capacitance of the nRF51 and nRF52 is 4 pF so you must subtract this. The formula for the load caps then becomes: Ccap = CL * 2 - 4 pF</p> <p>12 pF is not a hard value to get.</p><div style="clear:both;"></div>