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