Overview
The STK672-642A-E is a hybrid IC for use as a unipolar, 2-phase stepping motor driver with PWM current control.
   
Features
• Built-in overcurrent detection function (output current OFF).
• Built-in overheat detection function (output current OFF).
• If either over-current or overheat detection function is activated,
    the FAULT signal (active low) is output.
• Built-in power on reset function.
• The motor speed is controlled by the frequency of
    an external clock signal.
• 2 phase or 1-2 phase excitation switching function.
• Using either or both edges of the clock signal switching function.
• Phase is maintained even when the excitation mode is switched.
• Rotational direction switching function.
• Supports schmitt input for 2.5V high level input.
• Incorporating a current detection resistor
    (0.089Ω: resistor tolerance ±2%), motor current
    can be set using two external resistors.
• The ENABLE pin can be used to cut output current
    while maintaining the excitation mode.
• With a wide current setting range, power consumption
    can be reduced during standby.
• No motor sound is generated during hold mode due to
    external excitation current control.
• Miniature package (provides pin compatibility with STK672-640A-E)
   
Applications
• Office photocopiers, printers, etc.