.. zephyr:code-sample:: nrf_system_off
:name: System Off
:relevant-api: sys_poweroff subsys_pm_device
Use deep sleep on Nordic platforms.
Overview
********
This sample can be used for basic power measurement and as an example of
deep sleep on Nordic platforms.
RAM Retention
=============
This sample can also can demonstrate RAM retention. By selecting
``CONFIG_APP_USE_NRF_RETENTION=y`` or ``CONFIG_APP_USE_RETAINED_MEM=y``
state related to number of boots, number of times system off was entered,
and total uptime since initial power-on are retained in a checksummed data structure.
RAM is configured to keep the containing section powered while in system-off mode.
Requirements
************
This application uses nRF51 DK, nRF52 DK or nRF54L15 PDK board for the demo.
Sample Output
=============
nRF52 core output
-----------------
.. code-block:: console
*** Booting Zephyr OS build v2.3.0-rc1-204-g5f2eb85f728d ***
nrf52dk system off demo
Entering system off; press sw0 to restart
9356999229