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L6474: Can only see pulses on one of the phases?

Question asked by swingdv on Jul 15, 2015
Latest reply on Jun 10, 2016 by Mike
A colleague and I noticed something unusual when we were using an L6474 to drive a stepper motor.

When the motor was stationary, we observed pulses on both of the motor phases.  This presumably corresponds to the PWM pattern used to generate the holding torque.  When the motor was in motion though, we only observed pulses on one of the phases.  This doesn't seem right, so what might be going on?

I ask because we are trying to diagnose this unusual issue in which the motors stall at a lower speed than what we would expect.

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