Thingy91x absolute minimum power consumption

RE: Thingy91x absolute minimum power consumption

Achim Kraus — Fri, 28 Nov 2025 17:04:04 GMT

[quote userid="132415" url="~/f/nordic-q-a/121868/thingy91x-absolute-minimum-power-consumption/555607"]Although probably not important for this sample, i checked and BMP350 (and remaining i2c sensors) are disabled in the output .dts after build.[/quote]

AFAIK, the important part is to execute the "nrf/boards/nordic/thingy91x/bmm350_init_minimal.c", which is included in the "nrf/boards/nordic/thingy91x/CMakeLists.txt" with

if (CONFIG_SENSOR AND CONFIG_REGULATOR AND CONFIG_I2C AND NOT CONFIG_BMM350)
zephyr_library_named(bmm350_init_minimal)
zephyr_library_sources(bmm350_init_minimal.c)
endif()

So, I would check, if the CONFIGs are all on and off accordingly.

RE: Thingy91x absolute minimum power consumption

RicPT — Thu, 27 Nov 2025 12:15:12 GMT

Hi again, Achim Kraus

I was having strange power consumptions and went back to the UDP sample, still using SDK 3.0.1 in Thingy91x and using the PPK 2 setup as before, in ampere meter mode.

Although probably not important for this sample, i checked and BMP350 (and remaining i2c sensors) are disabled in the output .dts after build.

Whatever I do, I don't seem to be able to go below the 300uA quiescent.

If i check the power consumption using the expansion board, I can confirm the low power consumption you also got for both nrf91 and nrf53, but never, neither using source meter (PPK2 directly supplying power ) nor ampere meter (battery setup).

Hope you ( or someone else that had this issue ) might shed some light on this.

Thank you in advance!

RE: Thingy91x absolute minimum power consumption

RicPT — Mon, 02 Jun 2025 08:35:50 GMT

Thank you for your suggestion, Achim.
I tested that example yesterday and in in fact seems to go down to 2 uA.

Seems a bit more promising this way :-)

RE: Thingy91x absolute minimum power consumption

Achim Kraus — Mon, 02 Jun 2025 06:56:07 GMT

My last measurement was about 19µA (NCS 2.9.1).

Maybe it's the BMM350 as in my ticket some time ago.

You may also test with the "nrf/samples/cellular/udp" to see, which quiescent current that has.