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MCT8329A: Trying to measure the motor current using the MCT8329EVM

Mike Sprauve
Intellectual 390 points
Part Number: MCT8329A
Other Parts Discussed in Thread: MCT8329EVM

Tool/software:

hello 

We are using the MCt8329EVM to evaluate our brushless 3 phase 24VDC motor. Can someone please tell me how to convert the value read from SYS_STATUS3 to Amps, we currently simply read the number and divide by 256 but seems to yield the wrong values from what we are expecting. 

Thanks 

  • 0
    TI__Mastermind 23582 points

    Hi Mike,

    The data sheet revision will be updating the correction.

    We need to use factor to convert to actual current.

     Current (in A) = (DC_BUS_CURR / 256 * (10mOhm/Rsense)).

    The 10mOhm is default factor device internally using and hence please use the scaling as shown.

    Thanks and Best regards

    Venkatadri S