https://devzone.nordicsemi.com/f/nordic-q-a/89088/configuration-pin-in-open-drain-output---low-state-unexpectedHi, I would like to declare my pin in output open-drain, so i use this configuration My issue is when i declare my pin, I have an unexpected low state that occur, is this normal? I tried to configure with pullup, but same behavior. en-USTelligent Community 13Wed, 22 Jun 2022 07:03:00 GMThttps://devzone.nordicsemi.com/thread/373580?ContentTypeID=1Wed, 22 Jun 2022 07:03:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1c5df0dc-bf43-4541-9e8c-e56d60071be0Julien<p>Thanks, it&#39;s working !</p> <p></p> <p>Best regards,</p> <p></p> <p>Julien</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/372959?ContentTypeID=1Fri, 17 Jun 2022 08:44:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:487effd5-cc3d-4edc-9cb7-7194d9b7ad7dVidar Berg<p>Hello Julien,</p> <p>Please try to &#39;set&#39; the pin before you configure it. Like this:</p> <p>&nbsp;&nbsp;&nbsp; nrf_gpio_pin_set(PIN_1); &nbsp; // define pin state first to avoid glitch during configuration &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp; <br />&nbsp;&nbsp;&nbsp; nrf_gpio_pin_set(PIN_2);</p> <p>&nbsp;&nbsp;&nbsp; gpio_cfg_output_open_collector(PIN_1); // pin goes high to down <br />&nbsp;&nbsp;&nbsp; gpio_cfg_output_open_collector(PIN_2); // pin goes high to down <br />&nbsp;&nbsp; &nbsp;<br />Best regards,</p> <p>Vidar</p> <p><strong>Edit: </strong>Forgot to add that this is expected behavior because the OUT register reset value is 0x0:</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/pastedimage1655455760747v1.png" alt=" " /></p><div style="clear:both;"></div>