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DRV8889-Q1: Special work condition consideration

Daniel Wang (auto)
Intellectual 1280 points
Part Number: DRV8889-Q1

Tool/software:

Hello team,

Kindly ask several questions:


1: When the step motor is running, if the SPI signal is lost at this time, what will happen to the step motor? Will it stop at its current location?

2: When the step motor is running, if the power supply is lost at this time, what will happen to the step motor? Will it stop at its current location?

3: Does DRV8889 set a default position for a step motor?

Thanks!

  • 0
    TI__Genius 10355 points

    Hi Daniel,

    1) You would see a SPI error, nFAULT is driven low:

    Are they using SPI_STEP or the physical STEP pin to advance the indexer. If they are using the STEP pin, then the motor will keep moving. If they are using the SPI, then it will stop.

    2) 

    The motor will stop in in its current location as the bridges are HI-Z. 

    3) The indexer starts at the following position:

     

    Best,

    Keerthi