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    BMA456 Not working (I2C)

    tawa
    New Poster

    BMA456 Not working (I2C)

    Hello,

    I'm opening this thread because I made a custom board with a BMA456 sensor, but it's not working. If I try to read the 0x00 register I don't get the 0x16 as result. I also tried to connect my board to arduino and run one of the examples but they also don't work. The other I2C sensors are all working. I tried both 0x18 and 0x19 as device address. I also tried to use the online API for this sensor, and I get "bma456_read_int_status.Error [65532] : Null pointer"

    Did I do any error in the schematic that prevents the sensor from working? If yes, is it possible to fix it somehow without printing a new PCB?

    If the schematic is correct, what can it be the issue?

    tawa_0-1638988511083.png

    Thank you all in advance,

    Best regards

     

    4 REPLIES 4
    doppio-R
    New Poster

    Re: BMA456 Not working (I2C)

    Good evening,

    one aspect in the schematic is, that I miss the use pull-up resistors (4,7k) for each I2C wire. Maybe you could try this.

    Additional I would check if the sensor is his right position. The SDO pin should have the voltage of Vcc or GND. Make sure it has a defined voltage.

     

    Best regards

    BSTRobin
    Community Moderator

    Re: BMA456 Not working (I2C)

    Hello tawa,

    For hardware side, you should ensure SCL, SDA I2C bus had pull up resistance(from host MCU or external).

    Refer BMA456 github code, https://github.com/BoschSensortec/BMA456-Sensor-API/tree/master/examples/bma456/generic

    You also could refer example code in other community topic for BMA456 discussion. https://community.bosch-sensortec.com/t5/MEMS-sensors-forum/BMA456-Init-fail/m-p/47081

    tawa
    New Poster

    Re: BMA456 Not working (I2C)

    I didn't put pull-up resistors because my MCU has already pull up resistors. 
    I tried to follow the example already, but it's not working, I'll try again from zero.

    Regarding the schematic, how I connected the jumper to the other elements is correct? Maybe the problem comes from there. What do you think about it?

    BSTRobin
    Community Moderator

    Re: BMA456 Not working (I2C)

    Hello tawa,

    Haven't seen mistake in your schematic. You could try to setup your software.

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