Bosch Sensortec Community

    cancel
    Showing results for 
    Search instead for 
    Did you mean: 
    SOLVED

    BME688/BME380 Datasheet error with Gas Measurement

    BME688/BME380 Datasheet error with Gas Measurement

    phil-by-sea
    New Poster

    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
    Community Moderator

    Hi phil-by-sea,

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

    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
    Community Moderator

    Hi phil-by-sea,

    Let us check and give your feedback later.

    No worries Robin,

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

    Icon--AD-black-48x48Icon--address-consumer-data-black-48x48Icon--appointment-black-48x48Icon--back-left-black-48x48Icon--calendar-black-48x48Icon--center-alignedIcon--Checkbox-checkIcon--clock-black-48x48Icon--close-black-48x48Icon--compare-black-48x48Icon--confirmation-black-48x48Icon--dealer-details-black-48x48Icon--delete-black-48x48Icon--delivery-black-48x48Icon--down-black-48x48Icon--download-black-48x48Ic-OverlayAlertIcon--externallink-black-48x48Icon-Filledforward-right_adjustedIcon--grid-view-black-48x48IC_gd_Check-Circle170821_Icons_Community170823_Bosch_Icons170823_Bosch_Icons170821_Icons_CommunityIC-logout170821_Icons_Community170825_Bosch_Icons170821_Icons_CommunityIC-shopping-cart2170821_Icons_CommunityIC-upIC_UserIcon--imageIcon--info-i-black-48x48Icon--left-alignedIcon--Less-minimize-black-48x48Icon-FilledIcon--List-Check-grennIcon--List-Check-blackIcon--List-Cross-blackIcon--list-view-mobile-black-48x48Icon--list-view-black-48x48Icon--More-Maximize-black-48x48Icon--my-product-black-48x48Icon--newsletter-black-48x48Icon--payment-black-48x48Icon--print-black-48x48Icon--promotion-black-48x48Icon--registration-black-48x48Icon--Reset-black-48x48Icon--right-alignedshare-circle1Icon--share-black-48x48Icon--shopping-bag-black-48x48Icon-shopping-cartIcon--start-play-black-48x48Icon--store-locator-black-48x48Ic-OverlayAlertIcon--summary-black-48x48tumblrIcon-FilledvineIc-OverlayAlertwhishlist