40uA on Power OFF nrf52832 s223

RE: 40uA on Power OFF nrf52832 s223

Stian Røed Hafskjold — Thu, 05 Jan 2017 14:08:49 GMT

Yes, if you're able to post your project here, that would be great.

RE: 40uA on Power OFF nrf52832 s223

Stian Røed Hafskjold — Thu, 05 Jan 2017 14:07:16 GMT

Hi, are you measuring on the pca10040 DK or are you using a custom board? And what equipment are you using to measure current?

It could be that the ADC is still running? Could you try to just run the below code and see what the current consumption is, just so we know that it's not any hardware or measurement issues. Also try to enable the peripherals one after another to see when the consumption goes up.

int main(void)
{
    utils_setup();
    softdevice_setup();
    sd_power_system_off();
    for (;;)
    {
        uint32_t err_code = sd_app_evt_wait();
        APP_ERROR_CHECK(err_code);
    }
}

Also, you always want to end your code with an infinite loop so that the CPU knows where to continue (e.g. if it returns from sd_power_system_off() (even though it might not do that))

RE: 40uA on Power OFF nrf52832 s223

Wojtek — Thu, 05 Jan 2017 10:11:59 GMT

OK i thought it might be something with hardware bug in timer (errata 78), but if you are using drv, appareantly it is not. I would check the board first or post the whole (simplified but able to compile) project here.

RE: 40uA on Power OFF nrf52832 s223

cavalihno — Thu, 05 Jan 2017 09:46:54 GMT

Both are crystal. Still the same problem. I am not sure if I do power_off steps properly.

RE: 40uA on Power OFF nrf52832 s223

cavalihno — Wed, 04 Jan 2017 18:02:06 GMT

void timer_disable(void) { nrf_drv_timer_disable(&m_timer); }

&m_timer is instance of timer static const nrf_drv_timer_t m_timer = NRF_DRV_TIMER_INSTANCE(1);

RE: 40uA on Power OFF nrf52832 s223

Wojtek — Wed, 04 Jan 2017 17:53:24 GMT

I mean if they are both crystals or what - I assume they are. There are few things that may go wrong here - hard to say without seeing code. However, I will try another blind-shot: what is inside timer_disable() function?

RE: 40uA on Power OFF nrf52832 s223

cavalihno — Wed, 04 Jan 2017 17:51:16 GMT

HFCLK - 32MHz LFCLK - 32,768 kHz

RE: 40uA on Power OFF nrf52832 s223

Wojtek — Wed, 04 Jan 2017 17:43:20 GMT

Sorry I edited my above comment just after you answered - you may have missed it. I would check that code on nrf52-DK and measure the current. Maybe something else is draining power.

RE: 40uA on Power OFF nrf52832 s223

cavalihno — Wed, 04 Jan 2017 17:39:41 GMT

Sorry, my mistake, I am using s223 ANT+ softdevice. No, inside the loop is only sleep until FORCE_SLEEP == 1. Then executs power_down(). Here nRF diables all pherips and go to Power OFF and now current consumption is 40uA.

RE: 40uA on Power OFF nrf52832 s223

Wojtek — Wed, 04 Jan 2017 17:35:07 GMT

By POWER OFF you mean code inside while loop? If so, you should use sd_app_evt_wait instead of these SEV and WFE instructions when softdevice is enabled (is it?). I don't know which softdevice You are using, though there is no S223 :? Oh ok, by power off you mean power_down function. What LFCLK src are You using?