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    BNO055 power on reset issues

    Member

    Re: BNO055 power on reset issues

    Hi, you mentioned that Pin10 is a digital output that indicates when the part is executing bootloader code and should not be connected to ground?

    The datasheet of the BN0555 says it should be connected to GND... Is there a mistake in the BNO055 Datasheet?

    See snapshot:

    Screen Shot 2019-07-17 at 9.18.19 PM.png

    Community Moderator
    Community Moderator

    Re: BNO055 power on reset issues

    That datasheet mistake has been corrected many years ago... unfortunately some old datasheet versions are still circulating on the internet.

    Always refer to the latest version of the datasheet here : https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BNO055-DS000.pdf
    Member

    Re: BNO055 power on reset issues

    Hi, we've updated our design based on your feedback and wanted to know if our new BNO055 design is valid.

    We've added some circuitry to be able to change between I2C or UART mode using a GPIO from our MCU (notes in schematic).

    We've added more capacitance as you suggested and added an external crystal to mitigate the power on reset issue.

    Any feedback on our new design would be greatly appreciated.

    Screen Shot 2019-07-31 at 9.56.51 AM.png

    Community Moderator
    Community Moderator

    Re: BNO055 power on reset issues

    Looks good to me. But if your MCU supports i2c, I really cannot recommend using UART interface, unless you must connect it to a host that does not support i2c.
    Member

    Re: BNO055 power on reset issues

    Thank you.

    In regards to the UART we just want to have the ability to switch for testing purposes or to interface with another host that uses UART (as you mentioned).

     

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