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DRV8876: DRV8876

Roi Kobo
Intellectual 570 points
Part Number: DRV8876

Hi

I want to operate 2 motors at Independent Half-Bridge connection:

1. I'd like to know If can connect IN1 and IN2 to IMX6 and operate them with 3.3V IO. (without pwm) 

2. I'd like to know if can I left unconnected pins VREF, IPROPI  at Independent Half-Bridge connection?

3. could you please review mt schematic.

DRV8876-1.pdf

Roi

  • 0
    TI__Mastermind 37683 points

    Hi Roi,

    Roi Kobo said:
    1. I'd like to know If can connect IN1 and IN2 to IMX6 and operate them with 3.3V IO. (without pwm) 

    Yes. PWM input is only required if you wish to control average voltage across load.

    Roi Kobo said:
    2. I'd like to know if can I left unconnected pins VREF, IPROPI  at Independent Half-Bridge connection?

    VREF should be tied to 3.3V and IPROPI tied to GND. 

    More information is found here.

    Roi Kobo said:
    3. could you please review mt schematic.

    The only issue I see is that nFAULT does not have a pull-up resistor. Is that somewhere else in your schematic. If you don't plan to monitor the nFAULT line then a pull-up is not needed.

    Regards,

    Pablo armet

  • 0
    Genius 5030 points

    Hi Roi,

    Roi Kobo said:
    could you please review mt schematic.

    What is your target current limit for each motor? It will be hard to use IPROP to protect the motor as IPROP  is the sum of both motors and so it's hard to know when one motor has high current issue.

    1. Sure, with PMODE unconnected, you can use GPIO pin of MCU to drive INx pin to drive each motor.

    2. Sure, IPROP and Vref can be unconnected if not used.

    3. Schematic looks fine.

    Brian