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    How to get full range on BMI323

    How to get full range on BMI323

    dev_gnrb
    New Poster

    Hi, 

    I'm using a BMI323 Shuttle Board 3.0 Flyer connected in I²C on an Arduino Uno R3 thanks to a level shifter.

    My problem is when I read X, Y or Z axis, the return value sould be between -32768 and 32768 (2^16). But my usable range is -16384-> 16384, the other part (-32768 to -1616384 and 16385 to 32768) is never returned, why ?

    It seems it's working on 15 bits instead of 16 bits, do you know why is it working like that ?

    I'll link my Arduino code.

    My accelerometer is setup as follow: 

    * ODR: 0x000C -> 1600Hz
    * range: 0x0000 -> 2G
    * filtering: 0x0000 -> ODR/2
    * average: 0x0600 -> 64 sample
    * mode: 0x7000 -> High

    So I send 0x760C to the ACC_CONF register. 

     

    Thanks !  

     

    3 REPLIES 3

    BSTRobin
    Community Moderator
    Community Moderator

    Hi dev_gnrb,

    If you set BMI323 acc range to 2G, raw data output range should be -16384~+16384.

    BMI323 Range.png

    But 16384*2 = 32768 so it's not 16 bits right ? 🤔 

    BSTRobin
    Community Moderator
    Community Moderator

    Hi dev_gnrb,

    The sign bit uses 1 bit, and the output data contains positive and negative.

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