This is the documentation for the latest (main) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

nRF5x System Off demo


This sample can be used for basic power measurement and as an example of deep sleep on Nordic platforms.

RAM Retention

On nRF52 platforms this also can demonstrate RAM retention. By selecting CONFIG_APP_RETENTION=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. The POWER peripheral is configured to keep the containing RAM section powered while in system-off mode.


This application uses nRF51 DK or nRF52 DK board for the demo.

Sample Output

nRF52 core output

*** Booting Zephyr OS build v2.3.0-rc1-204-g5f2eb85f728d  ***

nrf52dk system off demo
Entering system off; press sw0 to restart