https://devzone.nordicsemi.com/f/nordic-q-a/18115/how-to-validate-32k-crystal-capacitorI am designing with nrf52832 and experiencing some connection issues at 0C. The system gets disconnected every few seconds with 32k crystal, but no issue with RC oscillator, so the issue should be related to the crystal. I confirmed the crystal meetsen-USTelligent Community 13Mon, 05 Dec 2016 07:15:03 GMThttps://devzone.nordicsemi.com/thread/69878?ContentTypeID=1Mon, 05 Dec 2016 07:15:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c8d4b303-b4c2-4b22-b480-d9f916e5eeb7bjorn-spockeli<p>You will have to probe the XL1 and XL2 pins with an oscilloscope to verify that the crystal is oscilating at 32768kHz.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/69877?ContentTypeID=1Fri, 02 Dec 2016 20:37:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:491a15ec-11c3-4c09-b303-d88d534c8626Sam<p>thanks. I found a cap that works across temperature with 500ppm setting on one device. Any actual validation I can do to confirm the crystal and its caps are correctly chosen besides checking the datasheet specs?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/69876?ContentTypeID=1Fri, 02 Dec 2016 13:55:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:99feea68-fa99-49c1-ab2f-b30fb81c52ddbjorn-spockeli<p>Hi Sam,</p> <p>I suggest that you take a look at the answer to <a href="https://devzone.nordicsemi.com/question/105248/how-much-is-the-internal-capacitance-of-the-nrf52832-crystal-chip/?answer=105372#post-id-105372">this</a> post.</p> <p>Best regards</p> <p>Bjørn</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/69875?ContentTypeID=1Fri, 02 Dec 2016 01:09:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7d89a514-2898-4cde-a614-f8ca88ac1549Dave_couling<p>For custom hardware its often best to get the parasitic capacitance of your PCB measure to verify that you have the correct loading capacitors (tuned to the expected value for that crystal)</p><div style="clear:both;"></div>