Overview The STK672-432A-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 FAULT1 signal (active low) is output. The FAULT2 signal is used to output the result of activation of protection circuit detection at 2 levels. • Built-in power on reset function. • A micro-step sine wave-driven driver can be activated merely by inputting an external clock. • External pins can be used to select 2, 1-2 (including pseudo-micro), W1-2, 2 W1-2, or 4W1-2 excitation. • The switch timing of the 4-phase distributor can be switched by setting an external pin (MODE3) to detect either the rise and fall, or rise only, of CLOCK input. • 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 (0.152Ω: 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. • A external excitation system is used for PWM operations. Fixed current control for shifting the phase of Ach/Bch is used for the PWM phase. • Miniature package (provides pin compatibility with STK672-430A-E) Applications • Office photocopiers, printers, etc.
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