Current measurements in low power modes

[sara]

Hello, I am working on a project that uses nrf52832 and I need to put that device and in the system on mode. For that, I want to measure the current in the system on and system off mode which is 1-2 uA and 0.2 uA respectively, but I do not get these values. Can you provide me with the code for which I can measure the current in system on and system off mode to get the above values? I had used ble_app-pwr-profiling example to get the values but I did not get the desired values.

[awneil]

sara said:

I do not get these values

So what values do you get?

And how, exactly, are you measuring?

At these levels, you need to be very careful about how you take the measurements - and to ensure that you are actually measuring just the DUT, and not leakage to other parts of your system ...

[sara]

I get 287.099 uA in system on mode. I am measuring using PPK and measuring only the DUT. I am using ble_app_pwr_profiling example.

SDK used is 15.3.0 

[Edvin]

What HW are you running the ble_app_pwr_profiling on? An nRF52832 DK? Did you cut SB9 before measureing?

[sara]

And I am trying since last two weeks but not able to get the current values. Please if possible share code with me even a simple code just to put the device in system off and system on mode  without softdevice will also do

[awneil]

Again, it's not just about the code - it's about how you are doing your measurements, and your hardware design.

Hence Edvin's question about hardware ...

[sara]

yes I am doing measurements on nRF52832 DK and had cut SB9 and short solder bridge SB12  and measuring using PPK by selecting External DUT and powering the nRF52 DK Board from P16 of the PPK kit to External Supply of the DK board.

And when I follow the above two steps for measuring current then all the 4 LEDs( LED1,LED2,LED3 and LED4) are dimly on, so I have to forcefully turn them off before I call the sleep function. So why this happens?