https://devzone.nordicsemi.com/f/nordic-q-a/123817/nrf9151dk-ncs-v3-0-2-zephyr---best-practice-to-go-into-sleep-mode-with-rtc-and-gpio-wakeupHello, I need support regarding putting my device to low power mode (sleep) and waking up with a timer or GPIO input. I’m working on an application using the nRF9151 DK, with nRF Connect SDK v3.0.2 (Zephyr RTOS). My goal is: Put the device into a lowen-USTelligent Community 13Wed, 20 Aug 2025 13:14:38 GMThttps://devzone.nordicsemi.com/thread/546209?ContentTypeID=1Wed, 20 Aug 2025 13:14:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:87617d26-41af-4646-9b05-4f4ff6ef31e6Achim Kraus<p>Though the nRF9151 is a SoC, it comes with different components and so also with different sleeping strategies. The two main components are:</p> <p>- the modem (that takes the most of the energy, if active)</p> <p>- the cortex-m33 application processor.</p> <p>To put the modem in a low power state, PSM is used very frequently. In some cases eDRX may get used and it&#39;s also not that uncommon to switch it on/off (lte_lc_normal/lte_lc_power_off).</p> <p>Your&nbsp;application processor will go in a low power state, if you use k_sleep or wait for something (e.g.&nbsp;k_sem_take or&nbsp;k_mutex_lock or poll). If you use multiple threads, all need to wait for something. The only thing you should not do is &quot;waiting in a busy-loop&quot;.</p><div style="clear:both;"></div>