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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

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

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