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  • Case ID: 308608
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Low Power consumption for nRF52 series of devices

ujur007

I was looking for different power options for nRF52/53 series of devices and possible want more information on how to reduce power such that device can run for months on a battery.

There was one interesting thread which discuss this for nRF51 series of devices. But that one is quite old (over 9 years now). So can someone from Nordic guide on this how to reduce power consumption of the device and individual blocks of SoC?

https://devzone.nordicsemi.com/f/nordic-q-a/1657/how-to-minimize-current-consumption-for-ble-application-on-nrf51822

Note: I have selected some tags to address topic for power consumption discussion.

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  • 0

    I was working on this topic and want to ask some more question regarding power consumption and reducing the power on nRF52840 device.

    Currently, I do not have Nordic PPK-2 and measure the current through ampere meter via header P21 on the nRF52840-DK. The current consumption is around ~25uAmps when device it ideal(not advertising) with spike of around ~100uAmps when device do advertise.

    To reduce the power I did some changes to my application. First, I disabled the serial monitor and Logging through config options. This reduces significant amount of current consumption.

    Still I think there can be reduction in power consumption hence I am posting some questions and my current code.

    I have disabled the peripherals which are not needed in device.overlay file. As the following file, there are many of them in disabled state.

    &uart0 {
    status = "disabled";
};
&uart1 {
    status = "disabled";
};

&spi0 {
	status = "disabled";
};
&gpiote{
    status = "disabled";
};

&spi1 {
	status = "disabled";
};
&spi3 {
    status = "disabled";
};

&qspi {
    status = "disabled";
};

&adc {
    status = "disabled";
};

&pdm0 {
	status = "disabled";
};
&i2c0 {
	status = "disabled";
};

&i2c1 {
	status = "disabled";
};

&nfct {
    status = "disabled";
};

    In Kconfig file, I have enabled DC-DC converter which in my understanding enabled by default and I do not need to enable through power API in my application. The same is for clock configuration which I have enabled the external low power LFCLK 32khz clock through Kconfig as well as in my code by nrfx_clock_start(NRF_CLOCK_DOMAIN_LFCLK);

    I also have powered down unused RAM by power_down_unused_ram();

    My question is what else can I change in my code to reduce power?

    The config file is as follows.

    CONFIG_GPIO=y

CONFIG_BT=y
CONFIG_BT_CENTRAL=y

CONFIG_BT_DEBUG_LOG=y
CONFIG_BT_SMP=y
CONFIG_BT_DIS=y
CONFIG_BT_DIS_PNP=n
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_GATT_CLIENT=y

CONFIG_BT_DEVICE_NAME="Key"
CONFIG_BT_DEVICE_APPEARANCE=833

CONFIG_PM=y
# Required to disable default behavior of deep sleep on timeout
CONFIG_PM_DEVICE=y

CONFIG_LOG=n
CONFIG_SERIAL=n

CONFIG_BOARD_ENABLE_DCDC_HV=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=y
CONFIG_RAM_POWER_DOWN_LIBRARY=y

CONFIG_CAF_POWER_MANAGER=y
CONFIG_CAF_POWER_MANAGER_TIMEOUT=10
CONFIG_CAF_POWER_MANAGER_STAY_ON=y

  • 0 in reply to ujur007

    Hi,

    What is flashed to the network core? Have you checked if logging is disabled for the network core?

    regards

    Jared 

  • 0 in reply to Jared

    Hi, It is single core. nRF52840. not nRF5340.

    I read that it can be disabled on nRF5340 on some article..

    Do I need to do anything for power management API? I do not understand it well though.

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