Hi Nordic Support,
I am measuring the low-power current consumption of an nRF54L15 DK using a Power Profiler Kit II (PPK2).
In the nRF54L15 DK / Nordic documentation, the PPK2 measurement is recommended at 3000 mV. I would like to know whether it is also valid to perform the same measurement at 1800 mV.
With the same firmware, I observe the following:
- At 3000 mV, the measured current is about 6.24 uA.
- At 1800 mV, based on the same power level, I would expect roughly 10.3 uA.
- When 1800 mV supply is first enabled, the measured current is indeed around 10.3 uA.
- However, after some time, the current slowly increases and eventually reaches around 20 uA.
The firmware is unchanged between the 3000 mV and 1800 mV measurements, and the device is expected to remain in the same low-power state during the whole measurement.
Could you please help clarify the following?
1. Is 1800 mV a valid supply voltage for this PPK2 low-power current measurement on the nRF54L15 DK, or should the measurement be done at 3000 mV to match the documented reference conditions?
2. What could cause the current at 1800 mV to start at approximately 10.3 uA and then slowly rise to around 20 uA?
3. Could this behavior be related to RAM retention settings in MEMCONF, DC/DC regulator configuration, Errata 31, PPK2 range switching, or known increased current behavior at low VDD?
4. Are there any recommended register settings, Kconfig/devicetree options, or SDK version requirements when measuring low-power current at 1.8 V on nRF54L15?
5. Is there a known VDD threshold below which the nRF54L15 low-power current may increase unexpectedly?
Development setup:
- Board: nRF54L15 DK
- SoC: nRF54L15
- Measurement tool: Power Profiler Kit II
- Supply voltage tested: 3000 mV and 1800 mV
- Measured current at 3000 mV: ~6.24 uA
- Measured current at 1800 mV: initially ~10.3 uA, then slowly increases to ~20 uA
- Firmware/application: [your application or sample name]
- Low-power mode: [System ON IDLE / System OFF / other]
- nRF Connect SDK version: [your NCS version]
- Toolchain version: [your toolchain version]
- Board revision: [your DK revision]
- PPK2 mode: [source meter / ampere meter]
- Measurement connection: [describe how PPK2 is connected]
I can provide the PPK2 trace/logs and firmware project if needed.
Thanks.
