Is 1K SWCLK pull-down required in nRF51822-QFAA? (spec 3.3) If 1K is required, can we replace it with 1.5K?https://devzone.nordicsemi.com/f/nordic-q-a/37363/is-1k-swclk-pull-down-required-in-nrf51822-qfaa-spec-3-3-if-1k-is-required-can-we-replace-it-with-1-5kIs 1K SWCLK pull-down required in nRF51822-QFAA? (spec 3.3) If 1K is required, can we replace it with 1.5K?en-USTelligent Community 13Mon, 13 Aug 2018 07:02:29 GMTRE: Is 1K SWCLK pull-down required in nRF51822-QFAA? (spec 3.3) If 1K is required, can we replace it with 1.5K?https://devzone.nordicsemi.com/thread/143844?ContentTypeID=1Mon, 13 Aug 2018 07:02:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4c81f9e4-24f8-431e-8700-8f5da7042c22H&#229;kon Alseth<p>Hi,</p> <p>&nbsp;</p> <p>This is to ensure that the chip does not enter debug mode due to noise.</p> <p>If your design has the SWDCLK pin routed with longer traces, I&#39;d recommend that you keep this at 1kOhm (or even lower, down to 470 ohm depending on the debugger used). More information about this specific pull-down resistor can be found here:&nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/16530/issue-with-nrf51-unexpectedly-entering-debug-mode/63240#63240">https://devzone.nordicsemi.com/f/nordic-q-a/16530/issue-with-nrf51-unexpectedly-entering-debug-mode/63240#63240</a></p> <p>&nbsp;</p> <p>Best regards,</p> <p>Håkon</p><div style="clear:both;"></div>