• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 31 subscribers
  • Views 2249 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV8881E PHASE/ENABLE interface

K.Yaita
Guru 29720 points

Other Parts Discussed in Thread: DRV8835, DRV8881

Hi Team,

I would like to ask PHASE/ENABLE interface of DRV8881E.
DRV8881E shows "H-bridge is disabled Hi-Z" when ENx is low.



On the other hand, DRV8835 shows "Brake(xOUT1=xOUT2=L)" when xENABLE is low.



Is seems DRV8881E doesn't have brake mode(xOUT1=L, xOUT2=L).
I wonder why there is difference although both devices have the same PHASE/ENABLE interface.
Could you tell me the background?

Best Regards,
Yaita / Japan disty

  • 0
    TI__Mastermind 26065 points
    Hi Yaita

    I think there is no history between DRV8835 and DRV8881. Let me confirm if there is any design reason here. Anyway we need to choose using braking or HiZ only in EN PH interface.

    Some of our device will have different EN action based on decay setting.

    Also DRV8881P have the braking function.

    Best regards,
  • 0 in reply to Wilson Zuo
    Guru 29720 points

    Hi Wilson-san,

    Thank you for your reply.
    Please let me know if you have additional information.

    Best Regards,
    Yaita

  • 0 in reply to K.Yaita
    TI__Mastermind 21805 points
    Just to confirm Wilson's statements:

    The DRV8881E is intended primairly for stepper motor driving, so the ENABLE pin puts the H-bridge into a Hi-Z state. (Brake mode is more often used for brushed motors)

    As Wilson mentioned, DRV8881P with the PWM interface does support both brake and coast modes - this device is better for brushed-DC motor driving.

    Thanks,
    Matt