Overview
The STK672-040 is a unipolar constant-current choppertype externally-excited 4-phase stepping motor driver hybrid IC which uses MOSFET power devices. It has a microstep operation-supported 4-phase distributed controller built-in to realize a high torque, low vibration, low noise stepping motor driver using a simple control circuit.

Features
• Microstep sine-wave driver operation using only an external clock input (0.33Ω current detection resistor built-in)
• Microstep drive using only an external reference voltage setting resistor
• 2, 1-2, W1-2, 2W1-2, 4W1-2 phase excitation selectable using external pins
• Selectable vector locus (perfect circle mode, inside 1 mode, outside 2 modes) to match motor characteristics in microstep drive state
• Phase hold function during excitation switching
• Schmitt trigger inputs with built-in pull-up resistor (20kΩ)
• Monitor output pin enabling real-time confirmation of IC excitation
• The CLK and RETURN inputs provide an internal noise elimination circuit as well as CMOS Schmitt circuit to prevent malfunction due to impulse noise.
• 4-phase distribution switch timing selected externally to either CLK rising-edge only detection mode or both rising-edge and falling-edge detection mode
• ENABLE pin for excitation current cutoff, thereby reducing system current drain when driver is stopped

Applications
• Printer, copier, and X-Y plotter stepping motor drivers