.. _nrf-system-off-sample: nRF5x System Off demo ##################### Overview ******** 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. Requirements ************ This application uses nRF51 DK or nRF52 DK board for the demo. Sample Output ============= nRF52 core output ----------------- .. code-block:: console *** Booting Zephyr OS build v2.3.0-rc1-204-g5f2eb85f728d *** nrf52dk_nrf52832 system off demo Entering system off; press sw0 to restart