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  • Case ID: 201231
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BLE error power consumption

Romain

Hi,

I use BMD-350 on NRF52832 with SDK v13.0.0

I configure my radio to run the BLE at -20dBm power through the API sd_ble_gap_tx_power_set()

But few seconds after starting advertising [ie 5 seconds] (my device is not yet connected to other device) my power consumption changes from 0.3mA to 1.2mA whereas my application doesn't change any register. But I think the SoftDevice changes configuration of  register which impacts power consumption.

Best regards,

Romain

  • 0

    Hi,

     

    What example in the SDK are you testing?

    Are you using any other peripherals?

    What happens if you don’t call  sd_ble_gap_tx_power_set(-20)?

    Does the power consumption change if you power cycle the device before you do the measurements?

  • 0 in reply to Sigurd

    I'm using only SPIS peripheral.

    If I don't call the function sd_ble_gap_tx_power_set(-20): the power consumption is the same as previously.

  • 0 in reply to Romain

    I'm not able to reproduce this. With 1.2mA, it' sounds like the SPI peripheral and the HFCLK is running. Could you provide some example code on how you do this?

  • 0 in reply to Sigurd

    I find my problem it comes from the SPIS library: the SPIS_CS (chip select) is set to input pin without pull polarity so when my master is off the pni state is undefined (tristate) and power consumption increase. And its not a problem to set this pin to pull-up by default because the ECU in low-power mode doesn't consume current for this pin configuration.

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