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DRV8823-Q1: application question

Sherry Liang
Genius 10255 points
Part Number: DRV8823-Q1
Other Parts Discussed in Thread: DRV8889-Q1,

Dear team,

1. Our device don't have open load, short to GND and short to power protection. Do we have discrete solution to achieve these three functions?

2. Can AISEN/BISEN pins to be used for stall current detection?

3. When driving stepper, the micro-step is 1/8. Is it fixed? Can we adjust it? If can, how?

4. Our device can drive both BDC and stepper. Do we need to configure them when the load is different? For example, if we use one 8823 to drive BDC, and another 8823 to drive stepper. What is the difference for the hardware and software design?

5. Do we have reference design to drive BDC and stepper?

Thanks & Best Regards,

Sherry

  • 0
    TI__Guru 55615 points

    Sherry,

    Are you able to consider a device change to a much newer device with the features you need including stall detection, open loead, etc?

    If so, please consider the DRV8889-Q1.

    https://www.ti.com/product/DRV8889-Q1

    Regards,

    Ryan

  • 0 in reply to Ryan Kehr
    TI__Genius 10255 points

    Hi Ryan,

    DRV8889-q1 can't drive BDC, this is why they want to choose DRV8823-Q1.

    Could you please help answer the question firstly?

    Thanks & Best Regards,

    Sherry

  • 0 in reply to Sherry Liang
    TI__Guru 55615 points

    Sherry,

    Does it have to be auto-qualified?  We have some other options, but I will answer the questions.

    1)  No, we do not have a discrete solution.

    2)  If they can add an external amplifier to read back the voltage on the AISEN/BISEN pins, then they can monitor current for a stall in BRUSHED motor ONLY.  Not possible for stepper.

    3)  If customer needs 1/8 microstepping, they will have to implement using VREF pins or by using scaling bits in the device (xI0, xI1, xI2).  There is no built in indexer like the DRV8889-Q1.

    4)  Difference is very big especially if you need 1/8 ustep.

    5)  We do not.  

    Highly suggest using DRV8889-Q1 for stepper and another device for brushed.  

    Regards,

    Ryan