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DRV8434S: Several drivers control

Igor Chudakov
Prodigy 10 points
Part Number: DRV8434S

Tool/software:

Here is part of the control logic for this chip

 

Do I understand correctly that if I use several drivers I can use only one STEP and DIR signal for all of them and choose the controllable chip by the ENABLE signal?

Obviously I can drive only one chip at a time in this case.

It seems logical to me, but I want to be sure.

Thanks.

  • +1
    TI__Mastermind 44245 points

    Hello,

    The ENABLE control is for enabling and disabling the H-bridges outputs. The internal logic will be functional even when the outputs are disabled ENABLE = 0. The internal indexer will be actively changing states with STEP inputs.

    Igor Chudakov said:
    Do I understand correctly that if I use several drivers I can use only one STEP and DIR signal for all of them and choose the controllable chip by the ENABLE signal?

    If you use this approach you'll lose track of the indexer position (assuming you'll keep count of the steps in the microcontroller) vs. motor position for the driver that has ENABLE = 0. Of course you start and stop the motor with the ENABLE pin just that you cannot keep track of the indexer. So this will not be a preferred method for precise position control.

    Best approach would be to use separate STEP and DIR control inputs. Thank you.

    Regards, Murugavel 

  • 0 in reply to Murugavel4637
    Prodigy 10 points

    I see. Thar's pity, I wanted to save timers outputs.

    Thanks for clarification.