Intermittent High current consumption in sleep

RE: Intermittent High current consumption in sleep

Simonr — Thu, 18 Mar 2021 10:31:02 GMT

Glad to hear that Navaneeth! I will close this case then.

Best regards,

Simon

RE: Intermittent High current consumption in sleep

navan93 — Thu, 18 Mar 2021 02:50:12 GMT

Hi Simon,

This issue has been resolved. It was a leakage in the PCB which after some rework has been fixed.

Thank you very much for your time and support.

Regards,

Navaneeth

RE: Intermittent High current consumption in sleep

navan93 — Wed, 17 Mar 2021 02:47:15 GMT

Hi Simon,

There is no particular reason why I used __DSB(); and __WFI(); , its just how it was there in the OS that I am using.

I have also tried with NRF SDK15.3 using the "examples\peripheral\blinky\pca10056e\blank\ses" project , however I am seeing the same behavior.

/** @file
 *
 * @defgroup blinky_example_main main.c
 * @{
 * @ingroup blinky_example
 * @brief Blinky Example Application main file.
 *
 * This file contains the source code for a sample application to blink LEDs.
 *
 */

#include <stdbool.h>
#include <stdint.h>
#include "nrf_delay.h"
#include "boards.h"

/**
 * @brief Function for application main entry.
 */
int main(void)
{
    /* Configure board. */
    //bsp_board_init(BSP_INIT_LEDS);

    /* Toggle LEDs. */
    while (true)
    {
        __DSB();
        __WFI();
        //for (int i = 0; i < LEDS_NUMBER; i++)
        //{
        //    bsp_board_led_invert(i);
        //    nrf_delay_ms(500);
        //}
    }
}

/**
 *@}
 **/

Also tried using

{
    __SEV();
    __WFE();
    __WFE();
}

instead of __DSB(); and __WFI();. But as you already mentioned that did not make a difference.

Also will you be able to check this same code on a board at your end?

Regards

Navaneeth

RE: Intermittent High current consumption in sleep

navan93 — Tue, 16 Mar 2021 14:00:51 GMT

Hi Simon,

I will try to replicate this using the nrf sdk as well.
The current measurements were done using an Ammeter only. I did not clearly understand what you are referring to regarding measure using Ampere meter.

RE: Intermittent High current consumption in sleep

Simonr — Tue, 16 Mar 2021 11:52:08 GMT

Hi again

That sounds very strange indeed. Is there any reason you're using __DSB(); and __WFI(); instead of the more "conventional" loop?

    {
        __SEV();
        __WFE();
        __WFE();
    }

But I don't see why this would make a difference. I'm not familiar with the OS you're using, can you confirm that the current consumption is the same using an Ampere-meter for instance? As this is better for long term current consumption over time?

Best regards,

Simon

RE: Intermittent High current consumption in sleep

navan93 — Tue, 16 Mar 2021 02:31:09 GMT

Hi Simon,

Thank you for your quick response.

No I do not use any radio/BLE functionality. Basically this is all that is there in my main code. None of the timers are enabled nor is any other peripheral. Still I am seeing this periodic increase in Iq.

int
main(void)
{

 while (1) {
 __DSB();
 __WFI();
 }
 
 // Should never come here.
 return 0;
}

RE: Intermittent High current consumption in sleep

Simonr — Mon, 15 Mar 2021 13:14:30 GMT

Hi Navaneeth

Does your application use the radio for BLE or similar at all? How exactly do you put the device to sleep? Do you use the functions from the SDK to go to sleep, I.E. the idle_state_handle() which is used in most of our example projects. It prepares devices for sleep mode before calling the nrf_pwr_mgmt_run() function.

This doesn't sound like any of our errata, but it might be that a timer wakes up for some reason after 2 minutes in your application.

Best regards,

Simon