Current measurement in nrf52832

[Ridhi]

I have nrf52832 dk. I used power down example by github

 https://github.com/NordicPlayground/nrf51-powerdown-examples: system off wakeup on gpio. Upon current measuement by cutting SB9 bridge and soldering SB11, using coin cell battery and power profiler kit i got measurment current as 0.44micro A in system off mode and 5.98milli amp in wake up mode.

Now, i used temperature sensor, flash memory nrf52832 dk and used the same command as NRF_POWER->SYSTEMOFF = 1;

I flashed the code and found current as 0.66micro amp.

My query is that the current measured is right value or not. I have used power profiler kit vout on nrf current measurement upper pin and vin of profiler kit to lower pin of nrf current measurement.

Do flash and temperature sensor also add to the current values as i found from data sheet that the current values were w25q16 1ua and stts751

3ua respectively

[Simonr]

Hi

Are you using the PPK or the PPK 2 for current measurements? What SDK version are you using when flashing the temperature sensor example?

Yes, the external sensors you're using will also add to the total current consumption.

In system OFF mode without RAM retention the nRF52832 should be able to get down to ~0.3uA of current consumption. When measuring on the DK, there will be small amounts of leakage current, so 0.44uA seems correct. Please note that when running examples that use other peripherals (like the temperature sensor) we recommend you prepare the board for system off mode by turning off the peripherals before entering system off. See the main.c RAM_retention example for reference. 

If you also plan on using the radio peripheral at all I recommend using the SoftDevice and the sleep_mode_enter() function used in most of our BLE application to get into system OFF mode. 

Best regards,

Simon

[Ridhi]

Hi,

I have used PPK 2 and nrf sdk 17 soft device v_7.2.0. 

I want assistance that i have nrf 52832 dk, external flash and external sensor. When i intially burn the code on dk, my dk should be in system off mode ie all functionality should be off. Then i want to press a button fpr 5 seconds with which the device enters an advertising mode. and if not button pressed then no advertisment occurs and device remains in sleep mode

Can you assist pls.

[Simonr]

This does not seem related to the initial post, and I see that you've made a new ticket with this subject. A colleague of mine has been assigned to it and will get back to you.

Here on DevZone we strive to keep each ticket to one subject each, to make it easier for users in the future to navigate the site. Please let me know if you have any further questions regarding current measurements.

Best regards,

Simon