https://devzone.nordicsemi.com/f/nordic-q-a/111451/how-to-enter-low-power-mode-for-ncs-zephyr-rtosHi Support Team We use ncs to develop nRF52840 application and want to know how many low power mode do ncs have and how to enter these low power mode.We want the nRF52840 can be wake by RTC and get the lowest current consumption during low power modeen-USTelligent Community 13Fri, 24 May 2024 10:48:06 GMThttps://devzone.nordicsemi.com/thread/485781?ContentTypeID=1Fri, 24 May 2024 10:48:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bd4343c3-6929-4770-a537-c1c0e1de5895Menon<p>Hello,</p> <div>nRF52840 supports two low-power modes: low-power mode and system-off mode.</div> <div><strong>Low Power Mode</strong>: In this mode, the application enters CPU sleep mode when the kernel is in an idle state, which means it has nothing to schedule. Wake-up events are interrupts triggered by one of the SoC peripheral modules, such as RTC or SystemTick.</div> <div><strong>System Off Mode</strong>: This is the deepest power-saving mode the system can enter. In this mode, all core functionalities are powered down, and most peripherals are non-functional or non-responsive.</div> <div>See the<a href="https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/bluetooth/peripheral_power_profiling/README.html#overview"> Bluetooth:Power Profiling sample</a>, which explains a bit and also shows testing with the Power Profiler Kit.</div> <div>You can also read the device<a href="https://docs.zephyrproject.org/latest/services/pm/device.html">&nbsp;power management&nbsp;</a>section on Zephyr. As an example reference, take a look at the <a href="https://docs.zephyrproject.org/2.6.0/samples/boards/nrf/system_off/README.html">system off demo sample</a> from Zephyr. See the&nbsp;<a href="https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/test_and_optimize/optimizing/power.html#app-power-opt">power optimisation section</a>.</div> <div>&nbsp;</div> <div>Kind Regards,</div> <div>Abhijith</div><div style="clear:both;"></div>