https://devzone.nordicsemi.com/f/nordic-q-a/73794/gpio-in-high-impedance---low-powerHi, I use an NRF52840 in my product. The NRF52 is interfaced with an external module in UART. The NRF52840 is always powered by the battery using the different power mode to save battery. Due to high leakage current on the external module, we need a loaden-USTelligent Community 13Fri, 09 Apr 2021 11:40:09 GMThttps://devzone.nordicsemi.com/thread/303981?ContentTypeID=1Fri, 09 Apr 2021 11:40:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d9c0449b-0fae-42a0-8209-33bed3448ac2Einar Thorsrud<p>Hi,</p> [quote user=""]Is that a valid solution to&nbsp;reconfigure all the GPIO of the NRF52 in default configuration so they will be in Hi-z before&nbsp;disabling the power of the external module[/quote] <p>Yes, that is the way to do it. The default state is disconnected input, which is high impedance.</p> [quote user=""]Could you confirm that it&#39;s a true high-Z and that we will not have any leakage on the I/O?[/quote] <p>Yes. See <a href="https://devzone.nordicsemi.com/f/nordic-q-a/44923/more-detailed-specification-of-saadc-input-impedance/178017#178017">this post</a>.</p><div style="clear:both;"></div>