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    BME680 I2C Why the SDA pin is always low?

    Geralt
    New Poster

    BME680 I2C Why the SDA pin is always low?

    Geralt_0-1673237104491.png

    Why the SDA pin is always low?

    According to the standard I2C slave protocol, shouldn't the SDA slave pin be high when idle?

    Once I give the power, the SDA pin is low. Because of the SDA pin is always low, the STM32f401rct6 cannot establish communication with the BME680 and keeps saying "I2C_Busy"

    1 REPLY 1
    BSTRobin
    Community Moderator

    Re: BME680 I2C Why the SDA pin is always low?

    Hi Geralt,

    Your schematic is normal.
    If you have the BME680 shuttleboard, you can run the program and compare it.
    If there is no BME680 shuttle board on your side, you can check whether your hardware welding is normal.

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