About System off , System On, and sub power modes when softdevice present

RE: About System off , System On, and sub power modes when softdevice present

WestCoastDaz — Tue, 25 Sep 2018 18:04:24 GMT

As Jorgen said it sound like the micro isn't sleeping which is keeping the CPU awake. It also could be related to the debugger as well.

RE: About System off , System On, and sub power modes when softdevice present

Jørgen Holmefjord — Tue, 25 Sep 2018 10:52:33 GMT

How do you put the device in sleep mode with softdevice enabled? If you get ~5 mA, this indicate that the CPU is running and that the device is not put in system On idle mode.

You should call sd_app_evt_wait in a loop in main to make sure the device is put in idle mode. You can also use the power management library.

RE: About System off , System On, and sub power modes when softdevice present

Tejal Jagdale — Tue, 25 Sep 2018 10:03:37 GMT

Without softdevice and BLE application I can observe readings as mentioned below:

system off : 1.8uA
Idle state: 3.3uA
Sleep mode: 3.3uA

But with softdevice and BLE application running I am getting constant 5mA reading.

RE: About System off , System On, and sub power modes when softdevice present

WestCoastDaz — Mon, 24 Sep 2018 16:12:10 GMT

Tejal Jagdale,

Yes, calling the correct functions is enough for entry into these modes. It is up to you the programmer to setup up the correct wake up source before you enter system off unless you are using pin reset as the source.
Can you be more specific regarding the differences you are seeing and what hardware you are using? This repository power down examples is a good resource for testing the various power down modes including disabling RAM blocks.