Current consumption - nRF9161

[hk]

Hello, 

I have a question regarding the consumption of the nRF9161 DK board when it is under the following conditions: MCU on IDLE, modem off, wake on GPIOTE input (event mode, LATENCY=LowPower) with NCS 2.6.1.

The code shown below allows for a consumption of approximately 601 µA, which corresponds to the conditions specified in the datasheet for MCU on IDLE, modem off, wake on GPIOTE input (event mode, LATENCY=LowLatency).

#include <stdio.h>
#include <nrf_modem_gnss.h>
#include <modem/nrf_modem_lib.h>

int main(void)
{
	nrf_modem_lib_init();
	lte_lc_power_off();

	while(1){ 	
		k_cpu_idle();
	}
	
	return 0;
}

How can the code be modified to reflect the conditions specified in the datasheet for MCU on IDLE, modem off, wake on GPIOTE input (event mode, LATENCY=LowPower)?

[Charlie]

Hi,

You may refer to the following case:

 Level-triggered GPIO interrupt with NCS 2.7 on nRF9160 

Just need to change the GPIOE to event mode.

Best regards,

Charlie

[hk]

Hello,

Thank you for your reply. With that in mind, I made the following code with the following settings in prj.conf.

int main(void)
{
	int ret = nrf_modem_lib_init();
    if (ret) {
        printf("ERROR: Modem library initialization failed (%d)", ret);
        return ret;
    }

	printf("Input sample started\n");

	while(1){
		k_cpu_idle();
	}

	return 0;
}

prj.conf

CONFIG_LOG=y
CONFIG_LOG_MODE_MINIMAL=y

CONFIG_INPUT=y
CONFIG_INPUT_EVENT_DUMP=y

CONFIG_NRF_MODEM_LIB=y
CONFIG_SERIAL=y
CONFIG_INPUT_GPIO_KEYS=n

With CONFIG_SERIAL=n I got a value of 3.63 uA while with CONFIG_SERIAL=y I got a value of 603mA. Is it possible to get a lower value?

I still don't understand where I change the GPIOE to event mode.

[rajeev]

 Disabling serial RX helps to reduce power therefore 3.63 uA sounds pretty good.

How much lower do you want? In that case, maybe find a way to shut off the nRF9161 to get lower, which is then wake on GPIO by an external interrupt.