nRF54L15DK System_OFF and System_ON with RAM retained current measurement

[Muhammed]

As per nRF54L15 datasheet, system_off current at 3V VDD is 0.8uA. I am getting negative average current when i measuring System_OFF current consumption of nRF54L15 using nRF54L15DK board (VDD=3V) as below.

But when configure vdd=1.8V using nRF board configurator i'm getting ~0.9uA. 

Application : ncs\v3.1.1\zephyr\samples\boards\nordic\system_off

modified the application by adding CONFIG_APP_USE_RETAINED_MEM=n  in prj.conf .

i have followed the current measurement application notes.

Could you please help me with this? is there any configuration i missed?

[Simonr]

Hi

I tried to reproduce this on my end today. My setup is identical to yours except that I do measurements with the PPK2. I'm not able to see a negative current draw in any configuration on 1.8V, 2.5V or 3.3V. I have the same behavior on two boards, where it runs between 0.7-1.0µA in system OFF mode on two different DKs. Both one v0.9.2 and a v1.0.0 on my end. 

The only component I'm unfamiliar with in your setup is the Power Debugger. I assume it is the one from Microchip? https://www.microchip.com/en-us/development-tool/atpowerdebugger 

I see that the A channel has both a high and low range, so can you confirm it is not "locked" in the high range where t has only ~3µA resolution? I also see that the low-range resolution is only specified betweeen 1mA  1µA, so below 1µA I guess you're not guaranteed to get accurate measurements. I don't want to be the guy blaming your hardware, but since I'm not able to reproduce it on my end I don't see many other reasons for this. 

Best regards,

Simon

[Muhammed]

we measured with keysight DMM, got 0.8uA for the system_off mode.  Thanks for the support and suggestions.

Is there any example application available for measuring remaining configurations in sleep modes like Ion_Idle1 as below:

Thanks and regards,
Muhammed