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Extremely high current consumption during advertising - broadcast mode(ble_app_temp)

Rafal

I have written application similar to ble_app_temp (posted by Ole Morten) and during the test I noticed that current consumption is extremly high. I used brand new coin battery that was included in evaluation kit and after ~10 minutes battery status was only 40% ( I checked this also with ble_app_hrs app). At the beginning I though that it was caused by the data included in advertisment packet ( I added 10 bytes of data to manufacturer data - adv interval was 1 second), but then I tested my battery with original app (ble_app_temp) and the effect was the same. My question is: did anyone also encountered such a problem with high current consumpion in case of broadcaster mode? I will test different battery today but I am afraid that is not case of battery.

Thanks in advance for your help.

ble_app_temp.zip

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  • 0

    I have followed most of your comments (except cutting Uart lines). What's more, 38mA that I mentioned is measured based on voltage drop in the moment of radio transmition (so it really doesn't matter if there is some other constant current consumption, I am just measuring the voltage difference (from peak to constant consumption). I have also checked current consumption during transmition in case of ble_app_proximity and it looked similar - the peak to peak voltage was almost the same. I will be back from delegation on Friday and then I will perform more accurate tests, and of course share informations with you:)

    Best regards, Rafał

  • 0 in reply to Rafal

    I'm sorry, but there is simply no way that the chip itself can consume 38 mA. The only way I can see how such currents could even flow into the chip would be if there is something drawing a lot of current from GPIO, which if so would be outside spec (max 15 mA total, 5 mA per GPIO).

    The peak current consumption of the chip itself should be ~17 mA (13 mA RX + 4.4 mA CPU + ~3 µA for the RTC). You can see the expected current curves in the S110 Softdevice specification, sections 8.1 and 8.2. Does your curve look similar? If so, where exactly do you see this 38 mA peak? https://www.nordicsemi.com/eng/content/download/13238/213065/file/S110_SoftDevice_Specification_v1.2.pdf

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