Is GPIO configuration needed to achieve low power in System Off on nRF51, specifically for the UART signals?https://devzone.nordicsemi.com/f/nordic-q-a/10379/is-gpio-configuration-needed-to-achieve-low-power-in-system-off-on-nrf51-specifically-for-the-uart-signalsI am using sd_power_system_off() to enter System Off. It is my understanding that all peripherals are off in System Off, but that GPIO configuration is retained. I have a board that should, and has, gone down to 33uA at the battery when powered down,en-USTelligent Community 13Mon, 23 Nov 2015 16:46:32 GMTRE: Is GPIO configuration needed to achieve low power in System Off on nRF51, specifically for the UART signals?https://devzone.nordicsemi.com/thread/38532?ContentTypeID=1Mon, 23 Nov 2015 16:46:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:06d919a0-7eaf-49a8-a52f-caad0ab59d0aDavid Fritsch<p>Hi Ole... On the previous (Rev1) chip with soft device 6.0.0, I was using SDK 5.2.0. I will try your suggestion and report back.</p><div style="clear:both;"></div>RE: Is GPIO configuration needed to achieve low power in System Off on nRF51, specifically for the UART signals?https://devzone.nordicsemi.com/thread/38531?ContentTypeID=1Mon, 23 Nov 2015 15:52:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c9b0d3c6-dca3-4c3c-86eb-ddd669cdddaaOle Bauck<p>And you where using the same SDK on the previous chip? You can try to disconnect the pin by calling nrf_gpio_cfg_default(PIN_NUMBER) and see if it helps.</p><div style="clear:both;"></div>RE: Is GPIO configuration needed to achieve low power in System Off on nRF51, specifically for the UART signals?https://devzone.nordicsemi.com/thread/38530?ContentTypeID=1Mon, 23 Nov 2015 14:04:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f59e21d3-037f-467d-8a37-8dc969206d8eDavid Fritsch<p>Note - at the time I was porting my project from Rev1/sd_6.6.0 to Rev3/sd_8.0.0, that SDK 8.1.0 had a bug/issue that was important to me. So, that is why I used 8.0.0.</p> <p>See these: <a href="https://devzone.nordicsemi.com/question/37824/sdk-800-810-migration/">devzone.nordicsemi.com/.../</a> <a href="https://devzone.nordicsemi.com/question/40670/sdk81-and-sdk-90-app_gpiote-and-nrf_drv_gpiote-conflict/?answer=40671#post-id-40671">devzone.nordicsemi.com/.../</a></p><div style="clear:both;"></div>RE: Is GPIO configuration needed to achieve low power in System Off on nRF51, specifically for the UART signals?https://devzone.nordicsemi.com/thread/38529?ContentTypeID=1Mon, 23 Nov 2015 13:55:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:42280d30-b7cc-4dd6-b3dd-ccbd941fcdf3David Fritsch<p>I am using SDK 8.0.0.</p><div style="clear:both;"></div>RE: Is GPIO configuration needed to achieve low power in System Off on nRF51, specifically for the UART signals?https://devzone.nordicsemi.com/thread/38528?ContentTypeID=1Mon, 23 Nov 2015 13:47:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:64304e6a-d921-42ae-aa3b-a3715db0ca8bOle Bauck<p>Which SDK are you using?</p><div style="clear:both;"></div>