ATT_MTU Throughput Example power consumption

[lladzhang]

I am trying the example here:https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.0.0%2Fble_sdk_app_att_mtu.html

I want to lower the sleep current so I change to demo project to only advertise BLE after clicking button 3. Once the board receives some data from another BLE board, it shuts down BLE. I thought nrf_pwr_mgmt_run function would lower the sleep current but it turns out to be around 2mA. I would expect the sleep current to be in uA level. 

Here is how I measure the current. I use nrf52832 dev board and cut SB9 bridge. Then I connect PCA63511 ppk board and connect the dev board to a Windows desktop via USB cable. On the desktop, I run nrf connect --> power profiler. 

Any thoughts on what was wrong here? Or if I missed some configurations?

some references that I followed: 

1. https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_nrf52832_dk%2FUG%2Fnrf52_DK%2Fprepare_board.html

2. https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.tools%2Fdita%2Ftools%2Fpower_profiler_kit%2FPPK_user_guide_Quick_start.html

Thanks,

[Stian Røed Hafskjold]

Hi, did you turn off logging? In the sdk_config.h file there is a define called NRF_LOG_ENABLED. Set this to 0.

Can you try to not do anything in main other than just run:   for(;;)__WFE();
This will just put the CPU to sleep. You should see around 2-4uA. Just to check that you are actually measuring the right current.

[lladzhang]

Thank Stian for the suggestions. This time, I only do for(;;)__WFE(); in the main function and I am seeing around 1.8 uA current. 

I am also able to bring down the sleep current by doing the following: NRF_LOG_ENABLED = 0; comment cli_init(), cli_start(), and cli_process().