DRV8718-Q1: SO pin

Tool/software:

Hi team,

When testing the DRV8718-Q1, the customer found that the SO pin of the DRV8718-Q1 continuously outputs a waveform at a frequency of 20ms.

As a result, when the motor stops operating(There is no current passing through the sample resistor at this point), the AD pin of the MCU still captures voltage fluctuations and reports current values of around 1A.

What is the possible cause of this waveform in SO pin? Could you help review and give some suggestions?

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Regards,

Ivy