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    BME688/BME380 Datasheet error with Gas Measurement

    phil-by-sea
    New Poster

    BME688/BME380 Datasheet error with Gas Measurement

    Hi,

    I've spent a few days trying to find why I can read TPH, but the ADC value for Gas was always zero.

    The datasheet shows the 'run_gas' flag in register 71h (Ctrl_gas_1), bit postion '4'. This is incorrect - it should be bit position '5'.

    Hope this saves some time for somebody!!!

    -Phil

    philbysea_1-1655385788376.png

     

    9 REPLIES 9
    BSTRobin
    Community Moderator

    Re: BME688/BME380 Datasheet error with Gas Measurement

    Hi phil-by-sea,

    Could we know why do you think run_gas bit in 0x71 should be bit 5?

    phil-by-sea
    New Poster

    Re: BME688/BME380 Datasheet error with Gas Measurement

    Hi Robin,

    Because setting Ctrl_gas_1 register (0x71) to: (BME68X_RUN_GAS_MSK & 0x20).

    Produces 'gas_r' readings which vary when I introduce and remove various gases.

    Setting Ctrl_gas_1 register (0x71) to: (BME68X_RUN_GAS_MSK & 0x10).

    Produces zero every time.

    BSTRobin
    Community Moderator

    Re: BME688/BME380 Datasheet error with Gas Measurement

    Hi phil-by-sea,

    Let us check and give your feedback later.

    phil-by-sea
    New Poster

    Re: BME688/BME380 Datasheet error with Gas Measurement

    No worries Robin,

    I can see you're busy on the forums.....

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