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DRV8842 I0-I4 pins

James Board
Prodigy 20 points
Other Parts Discussed in Thread: DRV8842

I'm not really sure what I should be applying to I0 to I4 to control the bridge current. Can some one clarify I[4..0] column of the Table 3 in the datasheet.

  • TI__Expert 7455 points

    Hi James,

    It depends on what you want to drive. If you want to drive a DC motor, you would just make all the Ix pins HI for 100% current and then set the ITRIP with the VREF and the SENSE resistor.

    If you want to drive a stepper with up to 32 degrees of microstepping, you can then go through all the 32 values of Ix in order to form up your sine wave. I documented such implementation on this app note: http://www.ti.com/general/docs/lit/getliterature.tsp?literatureNumber=slva443&fileType=pdf

    The App Note was writen before there was a DRV8842, but it all applies the same, except that instead of PHASE/ENALBE interface you have an INx interface.

    Hope the info helps. Best regards,

    Jose Quinones