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DESCRIPTION
The UT84520 Scrolling Mouse Controller is specially
designed to control PS/2 mouse device.This single chip can
interface with three key-switches and 4X-Y photo-couples plus
Z-axis directly to 8042 controller.
There are four types of Z-axis inputs used to implement
scrolling mouse functionality.
FEATURES
*Using 50KΩ+5% resistor for RC oscillation.
*Compatible with legacy PS/2 mouse.
*Compatible with Microsoft PS/2 scrolling mouse.
*Built-in noise immunity circuit.
*The sampling rate of motion detector is up to 65KHz.
*Built-in three step dynamic input impedance.
*Three key-switches and four photo-couples inputs.
*Photo couple test mode included﹒
*Low power dissipation.
*Two types Z direction input:
1.Photo couples input
2.Mechanical input
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