STK672-532

Overview

The STK672-532 is a thick-film hybrid integrated circuit designed for unipolar, two-phase stepper motor applications with PWM current control. It supports selectable 2-phase or 1-2 phase excitation modes via the MODE pin while maintaining phase continuity during mode switching. Motor speed is regulated by an external clock signal frequency, and rotation direction is controlled through the CWB pin. The device incorporates a 0.165Ω current detection resistor with ±2% tolerance, allowing motor current adjustment using two external resistors. An ENABLE pin facilitates output cutoff and resumption without losing excitation timing.

Feature Summary

• Supports selectable 2-phase or 1-2 phase excitation modes with continuous phase maintenance during switching
• Incorporates a built-in 0.165Ω current detection resistor for external motor current setting
• Features an ENABLE pin to cut motor output while preserving excitation timing
• Accepts Schmitt input signals compatible with 2.5V high level inputs

Applications

• Office photocopiers
• Printers

Procurement Notes

Verify the specific manufacturer source, as this component has been produced by both Sanyo Semicon Device and ON Semiconductor. Confirm that the datasheet matches the required electrical characteristics, particularly the 0.165Ω internal resistor value and the 2.5V Schmitt input compatibility. Ensure the package type and pinout align with the target PCB design before finalizing procurement.

Selection Notes

Select this component when a unipolar two-phase stepper driver with integrated current sensing is required. It is suitable for designs needing flexible excitation modes (2-phase or 1-2 phase) and precise speed control via external clock signals. The built-in fault protection and enable functionality make it appropriate for office automation equipment where reliability and controlled motor stopping are critical.

Part Context

This part belongs to the STK672 series of thick-film hybrid ICs manufactured by onsemi (formerly Sanyo Semicon Device). These components are specialized drivers for small to medium-sized stepper motors commonly found in precision electromechanical systems. The series offers various configurations tailored for different motor drive requirements in consumer and industrial electronics.

Replacement Considerations

STK672-740AN-E: Verify if the 0.089Ω internal resistor and active-low phase signal inputs are compatible with the existing circuit design.

FAQ

How is the motor rotation direction controlled?

The direction of rotation is changed by applying a high or low signal to the CWB pin used to select the direction of rotation.

What is the function of the MODE pin?

The MODE pin selects between 2-phase excitation and 1-2 phase excitation based on its state (low or high).