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DRV8889-Q1: Does it have the same or similar function as hold mode in BD63800MUF-C?

Yoshikazu Kawasaki
Intellectual 881 points
Part Number: DRV8889-Q1

Hello,

My customer has been investigating both BD63800MUF-C and DRV8889-Q1.  They like stall function in DRV8889-Q1, but do peak current hold mode in BD63800MUF-C.  Does DRV8889-Q1 have the same or similar function as the peak current hold mode?  Please see page.21 of the datasheet shown below for the information of the peak current hold mode.

https://www.rohm.com/products/motor-actuator-drivers/stepping-motor/bd63800muf-c-product

Best Regards,

Yoshikazu Kawasaki

  • 0
    TI__Guru 55615 points

    Kawasaki-san,

    The TRQ_DAC in the DRV8889-Q1 can be used to achieve the same function.  They would just have to update this register if they are driving or holding.  So, instead of two registers for this function in the Rohm device, we can achieve similar functionality with one device.

    Regards,

    Ryan

  • 0 in reply to Ryan Kehr
    Intellectual 881 points

    Hello Ryan-san,

    Thank you very much for your quick reply.  Does it require STEP pin=low as well or TRQ_DAC register is the only one to have the same function without any pin settings?

    Best Regards,

    Yoshikazu Kawasaki

  • 0 in reply to Yoshikazu Kawasaki
    TI__Guru 55615 points

    Kawasaki-san,

    I am not understanding your question fully.  Can you please add more details?

    Regards,

    Ryan

  • 0 in reply to Ryan Kehr
    Intellectual 881 points

    Hello Ryan-san,

    I'd like to confirm if TRQ_DAC register setting is the only condition to configure peak current hold.  My customer is wondering if STEP pin toggles, it might change, but your comments don't show such concerns.  I understand STEP pin or other pins don't affect the condition of the TRQ_DAC settings unless TRQ_DAC settings change.

    Best Regards,

    Yoshikazu Kawasaki

  • +1 in reply to Yoshikazu Kawasaki
    TI__Guru 55615 points

    Kawasaki-san,

    The external VREF input can also change the reference current level.  VREF and TRQ_DAC together will set the full-scale current of the driver.  STEP input and the internal stepper table (table 7-3) dictate the actual current in the motor coil.  STEP input changes the percentage of full-scale current available at the output.  

    So, yes...technically the STEP input does change the current.  VREF and TRQ_DAC settings are just used to scale full-scale level.

    Regards,

    Ryan