Hello,
I am evaluating the nRF54L15DK current consumption based on Nordic example: https://academy.nordicsemi.com/courses/nrf54l-series-express-course/lessons/lesson-5-development-choices-and-demo/topic/nrf54l-power-consumption-demo-part-1/.
So I have flashed the nRF54L15DK with provided demo.hex and everything works fine. By pressing BUTTON0 I change advertisement message interval.
Since I do not have Power Profiler KIt I have soldered 10 Ohm Resistor as R24 and used it to measure supply current on oscilloscope :
On the right one can observe three current peaks related to advertisement message, but before it is a current spike that overshoots. This spike happens before every adv msg. The DK was powered from USB on J3 and PMIC was set to 3V as suggested.
I have repeated the same measurement also with STLINK-V3PWR (device similar to Nordics PPK). Since this device is just a power source, I have unsoldered the R24 and connect 3V from STLINK-v3PWR between pin 2 and pin 3 of P6. I have left the debugger part powered from USB over J3.
Also in this case the spikes can be observed. Since the STLINK-V3PWR has bigger dynamic range it can be seen that spikes go up to 20mA.
Comparing my measurements to the example I think that spike should not be there. Since I am using the example code, I guess the issue must be in the hardware.
Do I need to cut/short some extra solder bridges? How should the DK be configured - I have turned off all the features(VCMO0/1, Power2LEDs,...)
Any other ideas?
BR
Urban
