Overview
The STK672-040 is a stepping motor driver hybrid IC that uses power MOSFETs in the output stage. It includes a built-in microstepping controller and is based on a unipolar constant-current PWM system. The STK672-040 supports application simplification and standardization by providing a built-in 4 phase distribution stepping motor controller. It supports five excitation methods: 2 phase, 1-2 phase, W1-2 phase, 2W1-2 phase, and 4W1-2 phase excitations, and can provide control of the basic stepping angle of the stepping motor divided into 1/16 step units. It also allows the motor speed to be controlled with only a clock signal.

FEATUREs
• Can implement stepping motor drive systems simply by providing a DC power supply and a clock pulse generator.

<Control Block Features>
• One of five drive types can be selected with the drive mode settings (M1, M2, and M3)
   —2 phase excitation drive
   —1-2 phase excitation drive
   —W1-2 phase excitation drive
   —2W1-2 phase excitation drive
   —4W1-2 phase excitation drive
• Provides four freely selectable modes for the vector locus during microstepping drive: circular mode, one inside mode, and two outside modes.
• Phase retention even if excitation is switched.
• The excitation phase state can be verified in real time from the MO1, MO2, and MOI signal output pins.
• The CLK input counter block can be selected to be one of the following by the high/low setting of the M3 input pin.
   —Rising edge only
   —Both rising and falling edges

APPLICATIONs
• Facsimile stepping motor drive (send and receive)
• Paper feed and optical system stepping motor drive in copiers
• Laser printer drum drive
• Printer carriage stepping motor drive
• X-Y plotter pen drive
• Industrial robots and other stepping motor applications