https://devzone.nordicsemi.com/f/nordic-q-a/51461/pwm-configuration-is-causing-ble-failuresUsing the nRF52840 with SDK15.3.0 and S140, I am seeing strange interactions between PWM and BLE. The PWM is configured to create a continuous 175kHz output just under 50% duty cycle. When I start the PWM after entering a BLE connection, theen-USTelligent Community 13Wed, 28 Aug 2019 12:00:24 GMThttps://devzone.nordicsemi.com/thread/206612?ContentTypeID=1Wed, 28 Aug 2019 12:00:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6726bf9f-9828-4e3a-903e-e6805d6be37dEdvin<p>Hello,</p> <p>It looks like you are onto something if the PWM trace is next to the 32k oscillator line, and you see connection drops that occur when the PWM is turned on, but it doesn&#39;t happen if you use the RC oscillator. And the fact that the link doesn&#39;t time out if you stop the PWM before the supervision timeout.</p> <p>All the symptoms match the root issue that the nRF&#39;s LFXTAL doesn&#39;t work properly when the PWM is running.</p> <p></p> <p>Is it possible to move the trace for the PWM? Or perhaps to change the pin that you use?</p> <p></p> <p>BR,</p> <p>Edvin</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/206433?ContentTypeID=1Tue, 27 Aug 2019 15:08:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:109e062d-b445-4e17-acfc-f3fafb92078fBretH<p>This is running on custom HW. It&nbsp;is likely a crosstalk issue. It turns out the P0.5 trace&nbsp;<span>runs parallel to the external 32k oscillator trace for a short distance. When I change the LF CLOCK source from xtal to internal RC, the issue goes away.</span></p> <p><span>More investigation is needed in order to confirm this as the root cause.</span></p><div style="clear:both;"></div>