https://devzone.nordicsemi.com/f/nordic-q-a/83861/case-about-nrf9160-uart-off-on-applicationHi, Why I use the function m_device_state_set(cons, PM_DEVICE_STATE_SUSPENDED); to close the serial port is still a large current:38.80uA? The verification method is as follows: sdk :ncs v1.8.0 dk:PCA10090 0.9.0 example path:D:\ncs\v1.8.0\peteren-USTelligent Community 13Thu, 10 Feb 2022 09:17:51 GMThttps://devzone.nordicsemi.com/thread/352252?ContentTypeID=1Thu, 10 Feb 2022 09:17:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:76e1c0b7-b785-478f-820f-916acce8a58fpeter.min<p><span>Hi Stian R&oslash;ed Hafskjold,</span></p> <p>Tests are available.<br />Thank you very much.<br />Kind regards,<br />Peter.Min</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/349732?ContentTypeID=1Wed, 26 Jan 2022 11:49:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:48e25f9c-c3fb-496f-860d-74fd3f15a35aStian R&#248;ed Hafskjold<p>Hi, I tried running your code here, and I got the same results as you did. The problem is this line: </p> <pre>ret = gpio_pin_interrupt_configure_dt(&amp;button, GPIO_INT_EDGE_TO_ACTIVE)</pre> <p><code>GPIO_INT_EDGE_TO_ACTIVE</code> will enable the GPIOTE IN event by default, which will lead to about 20-40 uA of additional current.</p> <p>The solution is to use the GPIO SENSE mechanism instead. You can do this by adding the following to the prj.conf file:</p> <pre>CONFIG_GPIO_NRF_INT_EDGE_USING_SENSE=y</pre> <p>Now the current should drop to normal idle current.</p> <p>Best regards,<br />Stian</p><div style="clear:both;"></div>