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.