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IA-FB, IB-FB, IC-FB Duplicate ADC Pins

Drew Westrick
Intellectual 880 points
Other Parts Discussed in Thread: DRV8301, MOTORWARE

On the DRV8301 EVM there are duplicate sense lines going to the microcontroller for the IA, IB, and IC. For instance IA-FB is connected to both ADCINA1 and ADCINB3. Is there a reason (safety or redundancy) that this signal is going to two different ADC ports?

  • 0
    TI__Prodigy 690 points
    The current feedbacks are placed that way for simultaneous sampling. For example, IA-FB is connected to ADC-A1 and IB-FB is connected to ADC-B1. By having a A, B pair with the same number, IA and IB are each applied to an individual sample-and-hold in parallel. The ADC peripheral then automatically converts A1 and then B1. By doing it this way, you can see IA and IB at the exact same time without a conversion delay. MotorWare does not implement this technique in software and the motor currents are sampled one after the other. The feedback option was put on the board just in case if it was needed in certain applications.

    -Eric
  • 0 in reply to Eric (ASP) Thomas
    Intellectual 880 points
    Thank you for the clarification. I don't think we will require simultaneous measurements so we will probably do away with one of the extra sense lines.