https://devzone.nordicsemi.com/f/nordic-q-a/21154/ppk-external-triggerHello: I tried to find this in the documentation but could not. Regarding the external trigger to the PPK (TRIG IN pin). Does this require a high-to-low transition, a low-to-high transition, or a pulse? If it requires a pulse, what is the minimum pulseen-USTelligent Community 13Fri, 07 Apr 2017 17:37:46 GMThttps://devzone.nordicsemi.com/thread/82779?ContentTypeID=1Fri, 07 Apr 2017 17:37:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:51f09adb-b9fd-4288-9044-d718e92a1502will<p>Thanks! I just wanted to make sure that it did not require a long pulse.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/82778?ContentTypeID=1Fri, 07 Apr 2017 07:28:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e0abd995-d0a6-46bc-b0bc-729740d46360wlgrd<p>It depends on which revision of the board you have.</p> <p>Version 1.1.0 needs a transition from low to high, and is pulled to GND when not held high externally.</p> <p>Versions below 1.1.0 was missing this pull-down, and thus need the same transition, but also to be externally forced to low in between triggers.</p> <p>With regards to timing, I don&#39;t know for sure, but it shouldn&#39;t cause any trouble. The GPIOTE module that reads this transition runs on a 16MHz clock. So it needs more than 62.5ns. But, we also have a pad capacitance of 3pF, which plays a role on how fast you can get up to the required voltage to accept it as a transition (which is minimum 0.7*VDD).</p><div style="clear:both;"></div>