nRF52833 Unable to Use External 32 MHz Crystalhttps://devzone.nordicsemi.com/f/nordic-q-a/127998/nrf52833-unable-to-use-external-32-mhz-crystalHewy there: I have a custom nRF52833 board with NCS v3.1.0, using ESB and USB CDC ACM. The external 32 MHz crystal is oscillating fine — we see a clean 32 MHz sine wave at 700 mVpp on the scope. Crystal is X201632MOB4SI (YSX211SL, CL=12 pF), with 12en-USTelligent Community 13Fri, 01 May 2026 10:57:00 GMTRE: nRF52833 Unable to Use External 32 MHz Crystalhttps://devzone.nordicsemi.com/thread/565775?ContentTypeID=1Fri, 01 May 2026 10:57:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0d9547b5-3daa-4c96-a121-f449675f27d7Turbo J<p>Oscilloscope probes puts a BIG load on the crystal - so big that it may not run once you remove the probes again.</p> <p>Usage of 12pF loading caps with a 12 pF crystal is almost surely wr0ng. You need to use the formula to calculate them, they should be close to twice as big IMHO. That would also explain why it only works with the scope attached...</p><div style="clear:both;"></div>