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    BMA456 chip-id read fails after frequent power on/off due to NACK from slave device.

    rajan
    New Poster

    BMA456 chip-id read fails after frequent power on/off due to NACK from slave device.

    Hi,

    I am using I2C bus for communication with BMA456. After the master device boots up, it attempts to read chip id. This operations fails sometimes(~50%)  and doesn't recover until master device it kept off atleast 1 minute and then powered on. The same bus is used for other accelerometer sensors and it works fine for them. Can you explain a way to fix this issue in case of BMA456?

    I have tried to search community page and found something similar with BMI088 at link https://community.bosch-sensortec.com/t5/MEMS-sensors-forum/BMI088-Soft-Reset-Failure/m-p/12540#M273....

    Is this issue resolved now for all the sensors?

    Thanks & Regards,

    Rajan Kumar

    3 REPLIES 3
    BSTRobin
    Community Moderator

    Re: BMA456 chip-id read fails after frequent power on/off due to NACK from slave device.

    Hi rajan,

    Could we know your hardware schematic and your I2C waveform?

    rajan
    New Poster

    Re: BMA456 chip-id read fails after frequent power on/off due to NACK from slave device.

    I have not captured the I2C waveform. In normal case, when the master is powered on, everything works fine. But as soon as I give frequent power on/off more than once, I2C read starts failing. 

    BSTRobin
    Community Moderator

    Re: BMA456 chip-id read fails after frequent power on/off due to NACK from slave device.

    Hi rajan,

    You need to check whether the supply voltage can quickly drop to reset the sensor when power is frequently turned on/off.

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