Bosch Sensortec Community

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

    BNO055 startup problems

    BNO055 startup problems

    jontrausti
    Member

    Hi,

     

    I've a bit a problem with some of our productions units. They sometimes report an init error due to the IMU not responding to our UART commands. After power cycling it becomes responsive. 

    I have not been able to recreate this on a desktop setup, therefore don't have any logic analyzes log of the communications - can attach normal behavior if requested. Mostly wanted to see if you had seen this before or have an idea where the problem is. 

    jontrausti_0-1659018510876.png

    Thanks, Jon

     

     

    7 REPLIES 7

    BSTRobin
    Community Moderator
    Community Moderator

    Hi jontrausti,

    BNO055 data sheet had mentioned the modification in the year 2020.
    https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bno055-ds000.pdf

    BNO055 pin 15 16 modification.png

    Like I said in previous reply the design we are working with is from prior to this recommandation. Like you correctly pointed out, this recommandation came into play in 2020. I hope you realize that it is not realistic to throwaway thousands of pcb's because your recommandation has changed with no support material on why the change was made ... I'm sorry, but sounds like  the change revision quality of Bosch is terrible and not something people can rely on - and therefore I am going to reject you resolution.... 

    BSTRobin
    Community Moderator
    Community Moderator

    Hi jontrausti,

    After internal confirmation, if the BNO055 pins 15 and 16 are connected to the GND, only some current will be increased, which will not affect the normal function of BNO055.

    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