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  • Case ID: 356960
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Baseline Power Consumption Benchmarking on nrf52dk

federicoc

Hello Nordic Forum,

I ran the Power Profiler Kit on an nRF52DK development board to establish a baseline power consumption.

The current firmware project is quite simple, and I have removed most of the GPIO, including UART, to minimize power consumption.

I have not enabled power management yet, as I am focusing on benchmarking the current power usage.

Currently, the kit reads about 23.25 mA while running in the main loop. Does this seem reasonable?

Would I expect to achieve a significant reduction in consumption if I enable Power Management, or would this only be beneficial when I add sensors that implement power management interfaces?

Thank you in advance for your knowledge and support.

Kind regards,


while (1) {
k_sleep(K_FOREVER);
}

CONFIG_CPP=y
CONFIG_GPIO=y
CONFIG_I2C=y
CONFIG_I2C_NRFX=y
CONFIG_CBPRINTF_FP_SUPPORT=y
CONFIG_DEBUG=y
CONFIG_PRINTK=y
CONFIG_LOG=y
  • 0 in reply to Vidar Berg

    Ok, so the configuration of board, ppk and wiring seems correct.
    I still struggle to understand how with everything disabled in
    prj.conf and overlay file and a code that only flashes an led on and off on the nrf52dk (pin 20), i read a current of 160uA when led is off.
    Is there a sample that has everything turned off and power mode configured for the lowest possible consumption that I can use for reference?

    Thank you

    CONFIG_CPP=y
    CONFIG_GPIO=y
    CONFIG_SERIAL=n
    CONFIG_PM_DEVICE=y
    &uart0 {
    status = "disabled";
    };


    &pwm0 {
    status = "disabled";
    };

    &bprot {
    status = "disabled";
    };

    &ccm {
    status = "disabled";
    };

    &ecb {
    status = "disabled";
    };

    &ficr {
    status = "disabled";
    };

    &gpiote {
    status = "okay";
    };

    &egu0 {
    status = "disabled";
    };

    &power {
    status = "disabled";
    };

    &reg {
    status = "disabled";
    };

    &egu1 {
    status = "disabled";
    };

    &egu2 {
    status = "disabled";
    };

    &egu3 {
    status = "disabled";
    };

    &egu4 {
    status = "disabled";
    };

    &egu5 {
    status = "disabled";
    };

    &rng {
    status = "disabled";
    };

    &ppi {
    status = "okay";
    };

    &nvic {
    status = "disabled";
    };

    &clock {
    status = "okay";
    };

    &uicr {
    status = "disabled";
    };

    &mwu {
    status = "disabled";
    };

    &wdt {
    status = "disabled";
    };
  • 0 in reply to federicoc

    If you try the "Hello World" sample it is sufficient to add CONFIG_SERIAL=n the project configuration (this is true for most samples). You can also try the pre-compiled hex I posted here /f/nordic-q-a/120743/ble-advertising-power-benchmark/532498.

    federicoc said:
    prj.conf and overlay file and a code that only flashes an led on and off on the nrf52dk (pin 20), i read a current of 160uA when led is off.

    Do you measure more when it is on? The measurements should not be affected by the led states as they are supplied by USB bus.

  • 0 in reply to Vidar Berg

    Vidar, thank you for your reply. 
    Indeed I get a higher current when the Led is on.
    Here is the trace with the pre-compiled hex:
    The shape is the same but the floor current is of around 194uA. Similar to what it was identified in the other blog as well.
    I am gonna try with a different dk and post the results here




  • 0 in reply to federicoc

    Thanks for confirming. This suggests that something is wrong with the setup. Hopefully, you will get the expected results when you try it on a different DK.

  • 0 in reply to Vidar Berg

    I was hoping to provide some progresses as I had ordered two more nrf52dk from digikey.
    Unfortunately, I tested one and i got the same 200uA result. 
    Could it be the ppk?

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