Bosch Sensortec Community

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

    BMX160 SDO pin floating in I2C setup

    BMX160 SDO pin floating in I2C setup

    timmbo
    New Poster

    Hey all,

    we have a BMX160 integrated into one of our hardware designs. We use the I2C interface. Just by accident we found that the SDO pin is floating, although it should be tied to either GND or VDDIO for the address selection (says the datasheet). The address seems to default to 0x69. Is there an internal pull-up on SDO and is it generally possible to leave the pin floating when using the I2C interface?

    Thanks in advance

    7 REPLIES 7

    BSTRobin
    Community Moderator
    Community Moderator

    Hi timmbo,

    When using the BMX160 I2C interface, the SDO pin can be floating, and the default is GND address.

    Dear BSTRobin,

    thanks for your answer! On our board the BMX talks on address 0x69 -> so I think it defaults to VDDIO and not GND, right?

    Best

    BSTRobin
    Community Moderator
    Community Moderator

    Hi timmbo,

    I2C address value depends on your hardware design.

    If SDO pin on your board is floating, I2C address value should be 0x68.

    I2C address.png

    Dear BSTRobin,

    we have about ~2000 devices where SDO (pin 1) is floating: 

    sdopin.PNG

    They all answer on 

    #define IMU_BMX160_ADDRESS                       0x69
     
    Is this an error in the datasheet maybe?
     
    Best
    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