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DRV10970: When changing direction, why is tLOCK_EN sometimes imposed (but not always)?

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Part Number: DRV10970

Can you define when tLOCK_EN (0.7 sec) is applied during a direction change? I have read many other e2e posts about direction change delays, but have not seen a clear explanation of when this delay is added.

When I change direction, I set PWM to zero, wait some 10's of msec, change FR, wait a few msec, then set PWM on again. Sometimes the motor reverses immediately, but sometimes it waits 0.7 sec before running again. I can't tell what conditions cause the extra delay.

Several e2e answers explain that the DRV waits for the motor to stop before it will change commutation direction. Is there a timeout shorter than tLOCK_EN that applies for determining "stopped"?


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