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DRV8412 Evaluation Board Dbus

ALbert Tello
Intellectual 735 points
Other Parts Discussed in Thread: DRV8412, DRV8312

Hi Ryan

I would like to ask why the functionality in stepper motor application to measure  ADC-Vhb[1,2,3,4]

  this is only  for Dbus ?

without  an OP the signal  will be  too noise, the EVM has only a divisor resistive  Why ?

Regards

Albert

  • 0
    TI__Guru 55615 points

    Albert,

    These readings are not used for stepper function.  We added this to allow the DRV8412 to be used for BLDC motor.  Since then, we have released the DRV8312 which is best for BLDC motor.

     

  • 0 in reply to Ryan Kehr
    Intellectual 735 points

    Ryan,

    Thank you for your answer.  I will review DRV8312 for our application.

    One more question when DRV8412 is used to control stepper,  I would like to ask if OC_ADJ can be connected to a Digital pot or a PWM DAC in order  to provide different Over Current Protection for different motors .   

    In the EVB 8412  OC_ADJ  signal can be selected in  JP3 to GND or DAC1 ,  trough series resistor 36K  , can be controlled only by a PWM DAC with out a resistor,

    -Can be used a Digital POT as an alternative way to have a range of Over current protection ?

      Albert

  • 0 in reply to ALbert Tello
    Intellectual 735 points

    Ryan,

    e use  DRV8432 we want to support different OC values for different motors , in datasheet mention to add a resistor between OC_ADJ  to AGND, can use a digital POT to program a resistor for different over current protection ?

    Albert