Power Consumption during sleep mode in NRF52832

[Thishon]

I am using NRF52832 Custom Board and Have to implement deep sleep for 1 minute and have to limit the current consumption to a very minimal value during the sleep cycle
 I have just enabled the log and used the below sleep function

#include <stdio.h>

#include <zephyr/sys/printk.h>

#include <zephyr/kernel.h>

int main(void)

{

    printk("Hello World! %s\n", CONFIG_BOARD);

    while(1){

        printk("Entering Sleep\n");

        k_msleep(60000);

    }

    return 0;

}

But when tracking the current consumption, I am getting roughly around 10mA which is huge for my application. How should I reduce the current consumption to uA. I have to use two SPI Pheripherals as well

[Stefan Schmidt]

Hi Thishon, do you have your debugger connected to the device?

[Thishon]

Yes I have RTT Viewer Connected

[Stefan Schmidt]

Could you try to disconnect everything when doing the actual measurement?

[Thishon]

I have added this configuration to prj.conf file:

CONFIG_LOG=y

CONFIG_PRINTK=y

CONFIG_PM=y

CONFIG_PM_DEVICE=y

CONFIG_PM_DEVICE_RUNTIME=y

CONFIG_BOARD_ENABLE_DCDC=y

Disconnecting the RTT Viewer I am getting around 1.8mA

[Stefan Schmidt]

Could you please retry the measurement with the J-Link disconnected? Like, phyiscally disconnected... No cable.

[Thishon]

I have already disconnected the J-Link and measuring the current using power profiler kit by powering the chip on using the kit.

[Stefan Schmidt]

You can disable LOG and printk and try again.

What is the ENABLE_DCDC in your prf.conf?

You could also check that the devices in the device tree have a pinctrl set for the sleep state and that "zephyr,pm-device-runtime-auto;" is set, so that they are set to sleep after initialisation when they are not used:

debug_rs232: &uart0 {
    status = "okay";
    current-speed = <115200>;
    pinctrl-0 = <&uart0_default>;
    pinctrl-1 = <&uart0_sleep>;
    pinctrl-names = "default", "sleep";
    zephyr,pm-device-runtime-auto;
};

[Thishon]

I have seen somewhere that we should enable the dcdc conversion so that the microcontroller would operate in 3.3 V and the current consumption would be limited. I am not sure which uart I am using for RTT Viewer debugger. My setup contains the GND, DIO and CLK pins for flashing the custom board. I am using another NRF Dev Kit. Where should I add power management in my dts file