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DRV8805 Output issue

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Hi

My customer is using DRV8805.
He has a issue.

STEP signal is not inputed, But DRV8805 output voltage to motor.
Please see attached file which is detail waveform.

This event isn't to add a capasitor of 0.1uF "between the 1-Pin (VM) and GND" and "between the 2-Pin (VCLAMP) and GND".

What is the cause of this issue?
Could you advice me?

Best regards
Shimizu

(Please visit the site to view this file)


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