https://devzone.nordicsemi.com/f/nordic-q-a/98070/how-to-use-pm-suspend-mode-in-zephyr-and-which-oneHi, I am working on the nRF52840DK using Zephyr NCS v2.1.2 on Windows. I am using the Zephyr CAF example. in which I have added my own sensors and it is working fine. Now I want to put the application into Suspend mode (i.e. System ON mode), anden-USTelligent Community 13Fri, 24 Mar 2023 13:47:56 GMThttps://devzone.nordicsemi.com/thread/417440?ContentTypeID=1Fri, 24 Mar 2023 13:47:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cb9fe559-fc3e-4875-9a12-515ee684c975Edvin<p>Hello,</p> <p>The way that you can see that all of our samples just uses a sleep function in the main loop is sufficient for the chip to go to sleep.</p> <p>As for the timer, you just set up the timer before you go to sleep. You can, for example, use an implementation looking something like this:</p> <p><a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/kernel/services/timing/timers.html#using-a-timer-expiry-function">https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/kernel/services/timing/timers.html#using-a-timer-expiry-function</a></p> <p></p> <p>Best regards,</p> <p>Edvin</p><div style="clear:both;"></div>