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

[Simonr]

Hi

Please check out our power optimization guide for some pointers on how to minimize current consumption.  Optimizing Power on nRF52 Designs 

It seems like a lot of steps are already mentioned by Stefan Schmidt here, but please make sure that logging is disabled, and that any peripherals that might draw power. Please also share how exactly you're measuring current in your project. Are there any other MCUs connected to the nRF52832 that might be drawing power in your design? Are the two SPI peripherals you mention connected and running for example?

Best regards,

Simon

[Thishon]

I am using an EFR32 Microcontroller by Silicon Labs to measure the current by providing 3.3V supply from it to my custom board.

Logging enabled and RTT Viewer Disconnected. I am getting a sleep current of 6.4 mA. I have implemented sleep for 60s.

Still After Disabling the logs, I am getting the same current consumption.

Sometimes I am getting the current value in uA during sleep initially after flashing and power cycling.

I am unable to figure out exactly what is happening. And what is my idle sleep current consumption. I have enabled the power management and wake up source for both of my SPI Peripherals in the device tree.

&spi2 {
	compatible = "nordic,nrf-spi";
	status = "okay";
	cs-gpios = <&gpio0 11 GPIO_ACTIVE_LOW>;
	pinctrl-0 = <&spi2_default>;
	pinctrl-1 = <&spi2_sleep>;
	pinctrl-names = "default", "sleep";
	lora0: sx1262@0 {
		compatible = "semtech,sx1262";
		reg = <0>;
		reset-gpios = <&gpio0 12 GPIO_ACTIVE_LOW>;
		dio1-gpios = <&gpio0 28 GPIO_PULL_DOWN>;
		spi-max-frequency = <DT_FREQ_M(8)>;
		busy-gpios = <&gpio0 31 0>;
		antenna-enable-gpios = <&gpio0 7 0>;
		tx-enable-gpios = <&gpio0 8 0>;
		wakeup-source;
		zephyr,pm-device-runtime-auto;
	};

	zephyr,pm-device-runtime-auto;
	wakeup-source;
};