Data storage device using programmable deglitch window to detect saturation of VCM current control

A method of operating a data storage device, the method comprising:

• using a head to read data recorded on a disk to generate a read signal;
• processing the read signal to generate a current command signal at a servo sample rate having a servo sample interval;
• detecting a current flowing through a voice coil motor (VCM) configured to actuate the head over the disk;
• generating a current error signal based on a difference between the current command signal and the detected current flowing through the VCM;
• generating an analog command signal based on the current error signal;
• applying the analog command signal to the VCM in order to actuate the VCM;
• detecting a saturation in the analog command signal;
• generating a first deglitch window during which the saturation detection is disabled;
• and
• programming the first deglitch window relative to the servo sample interval.

Control circuitry for use in a data storage device, the control circuitry configured to:

• detect a current flowing through a voice coil motor (VCM) configured to actuate a head over a disk;
• generate a current error signal based on a difference between a current command signal and the detected current flowing through the VCM;
• generate an analog command signal based on the current error signal;
• apply the analog command signal to the VCM in order to actuate the VCM;
• detect a saturation in the analog command signal;
• generate a first deglitch window during which the saturation detection is disabled;
• and
• receive a command to program the first deglitch window relative to a servo sample interval of a digital servo control loop configured to generate the current command signal.