The USMC-01 is a unique stepper motor controller IC. The chip can operate as a slave or master. As a slave, it runs under another microcontroller (or PC) or it can operate in auto-run (master) mode, which allows the user to add a few switches and run the stepper motor manually. The controller allows the RPMs of stepper motors to be switch selectable. Gray encoded inputs ensure that only one input needs to be changed at a time to switch between consecutive RPM settings. The RPM calculations are made for 1.8° per step, 200 steps per revolution motors.
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