nrf system on/off modes current measurement

[Ridhi]

hi, i have read nrf52832/40 product specs. i want to know about system off and system on modes. i am not getting what they mean pls explain in simple words. 

infocenter.nordicsemi.com/.../nRF52832_PS_v1.4.pdf

https://github.com/NordicPlayground/nrf51-powerdown-examples

i have also followed this example but i am not getting what is the difference in two power modes working

[Jared]

Hi,

System OFF: In this power mode the CPU is basically powered down, and the CPU is consuming extremely little current. The CPU will reset on a wakeup, which means that CPU won't retain the program state during the system off sleep. 

System ON(IDLE SLEEP): In this power mode the CPU is powered on but not doing anything. In most cases it just spins in a loop until the CPU "wakes up" due to a interrupt. Since the CPU is actually powered on, this sleep mode will draw significantly more power than system off sleep.

regards

Jared 

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[Ridhi]

i have nrf52832 device. I just want that my device after i put the code into it should enter into SYSTEM OFF mode directly and then after 5 secs if i reset then i exit from System OFF mode

[Jared]

Hi,

Yes this should be possible. Do you have a specific question regarding this?

regards

Jared 

[Ridhi]

kindly assist how can i do this pls

[Jared]

Hi,

System OFF can be entered by using nrf_pwr_mgmt_shutdown(NRF_PWR_MGMT_SHUTDOWN_GOTO_SYSOFF). The reset signal used to exit system off must be set externally. See the Power Management Example in the SDK.

best regards

Jared 

[Ridhi]

we want that directly when code is flashed the device should be in off mode