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DRV8811: DRV8811 drive motor appear speed too fast

Part Number: DRV8811

dear

    My customer fihd that DRV8811 drive  motor  appear speed too fast,phenomenon just show below picture

note: 频率 means  frequency

 It appears sometimes ,about  probability of 1/15

AOU1 AOUT2 BOUT1 BOUT2 wave shows as above picture 1 2 3 4 which means phase current wave 

In addition, D1 is STEP waveform, USM0 USM1 connection control unit, register set as L.

No-load pull in frequency of stepping motor great than or equal to 12000pps and detail Schematic show as belSw


how to slow down motor speed? Thanks in advance~