nRF52 NCS power consumption

[Vojislav]

Hi,

I am trying to put nRF52832 in low power. My starting point is NCS v1.2.0 peripherial_uart app. When started I had ~300uA in idle mode, and that was because UART was always on. After using Power Management to disable UART when device is not connected over BLE things are looking better. 

I have managed to get nRF52832 with NCS v1.2.0 into low power. The idle current is ~2.3uA according to Nordic PPK. Idle current for this chip is 2uA.
There are still some things that need to be figured out. There are some peaks which are not BLE advertising and need to figure out what they are (marked with red circles on the picture). Average power is 24uA (adv 500ms) and should be 20uA (online power profiler app)

My questions are:
* What are the peeks from (they were there also in the default sample peripherial_uart app)?
* What is adding extra ~300nA to idle current consumption?

Best regards,
Vojislav.

[Kenneth]

The 2uA is the typical current comsumption at room temperature for a typical chip. Small variation in temperature, production, or leakages though gpios may affect the number. Also the measurement equipment may have some tolerance. I would say ~300nA is within what you should expect.

The "peaks" you refer to is likely calibration of the internal 32kHz RC (presuming you are not using external 32kHz crystal).

[Vojislav]

Hi Kenneth,

Thank you for your replay. 
Currently, I am using nrf52dk board and peripheral uart example in NCS v1.2.0. Can you please check if that example is using external crystal?

Best regards,
Vojislav.

[Vojislav]

Hi Kenneth,

I am having similar issues with the new version of NCS 1.3.0. Please check the issue:
https://devzone.nordicsemi.com/f/nordic-q-a/64532/nrf52840-peripheral_uart-low-power-ncs-1-3-0

Best regards,
Vojislav.