Additional current consumption on NRF52 DK board

RE: Additional current consumption on NRF52 DK board

bjorn-spockeli — Fri, 27 Jul 2018 09:10:28 GMT

Here is the measurement

RE: Additional current consumption on NRF52 DK board

nimaaghli — Thu, 26 Jul 2018 16:35:54 GMT

Thank you for checking that out Bjorn,

I attached my hex file for you. Can you please flash it to your DK(It uses S132) and let me know what PPK results you get? I am reading ~400uA form my current meter.

devzone.nordicsemi.com/.../0246.nrf52832_5F00_xxaa.hex

RE: Additional current consumption on NRF52 DK board

bjorn-spockeli — Thu, 26 Jul 2018 08:25:25 GMT

Could you try running this code instead

/**@brief Function for application main entry.
 */
int main(void)
{
    NRF_POWER->SYSTEMOFF = 1;
    //Should never be reached
    while (true)
    {
    }
}

I did a measurement with the Nordic PPK and got the following result

RE: Additional current consumption on NRF52 DK board

nimaaghli — Thu, 26 Jul 2018 06:50:44 GMT

Just shorted SB28(reset the Interface MCU) and current dropped to 400uA In sd_power_system_off(); Still lot of current to draw in power off mode!

RE: Additional current consumption on NRF52 DK board

nimaaghli — Thu, 26 Jul 2018 02:37:09 GMT

Just ran this code and still 1.6mA

int main(void)
{
    err_code = sd_power_system_off();
    APP_ERROR_CHECK(err_code);
    while (true)
    {
    }
}

RE: Additional current consumption on NRF52 DK board

nimaaghli — Wed, 25 Jul 2018 17:19:06 GMT

Thanks for the reply,

Sorry, I have stated it wrong, P21 is where my battery is connected and P22 is in default config(shorted) and I am using µCurrent GOLD to measure the current(My 3v battery`s + line goes to current meter then connects to + pin of the P21) which I believe is pretty accurate current meter. I am using BLE_Proximity without any changes. This example goes to sleep after some time when it is not connected to pair. I expect to see very low current consumption at that point but it is still over 1mA.

I erase the chip and the board is still consuming more than 1mA!

RE: Additional current consumption on NRF52 DK board

bjorn-spockeli — Wed, 25 Jul 2018 09:31:18 GMT

Hi Nimaaghli,

Where are you connecting the external battery if you have shorted P21? Also could you state what kind of current meter device you're using? It needs to have a dynamic range from nA to tens of mA in order to accurately calculate the average current consumption.

It would also help if you attached the source code and the hex file so that I can perform measurements here.

Best regards

Bjørn