Achieve Lowest Power Consumption using EVK-NINA-B4 from Ublox (nRF52833)

RE: Achieve Lowest Power Consumption using EVK-NINA-B4 from Ublox (nRF52833)

Vidar Berg — Wed, 06 Nov 2024 14:08:23 GMT

Hi,

It’s not caused by the UARTE driver then, thanks for confirming. What is the exact idle current you’re measuring, and is it relatively stable at that level? I haven’t done any measurements with this board, so I’m not familiar with how it needs to be configured for measurements. High sleep currents can sometimes be a result of leakage or external circuitry. If you build and program the “hello world” sample with CONFIG_SERIAL=n, you should be able to measure 2-3 uA in idle.

Please try to measure the current in source mode (use PPK as the supply) if you have not already and see if you get the same result. This should be supported according to the EVK-NINA-B4 UG.

Best regards,

Vidar

RE: Achieve Lowest Power Consumption using EVK-NINA-B4 from Ublox (nRF52833)

Nordic_Newbie — Tue, 05 Nov 2024 15:02:21 GMT

Hi Vidar,

Yes, I've tried that as I found that documentation a couple of days ago while working on this. I created an overlay trying to disable as much as possible for this measurements, but I'm still unable to reach single digits micro amps.

&adc {
    status = "disabled";
};

&flash0 {
    status = "disabled";
};

&i2c0 {
    status = "disabled";
};

&i2c1 {
    status = "disabled";
};

&pwm0 {
    status = "disabled";
};

&radio {
    status = "disabled";
};

&spi0 {
    status = "disabled";
};

&spi1 {
    status = "disabled";
};

&spi2 {
    status = "disabled";
};

&uart0 {
    status = "disabled";
};

RE: Achieve Lowest Power Consumption using EVK-NINA-B4 from Ublox (nRF52833)

Vidar Berg — Tue, 05 Nov 2024 08:31:46 GMT

Hello,

For most samples, it is sufficient to disable the serial driver (UART) by adding CONFIG_SERIAL=n to the project configuration (prj.conf) to get the idle current down in the 2-3 uA range. This can also be achieved by disabling the UART nodes through a devicetree overlay. Have you done this already?

https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/test_and_optimize/optimizing/power_general.html

Best regards,

Vidar