GENERAL DESCRIPTION

The EM84502 Mouse Controller is specially designed to control PS/2 mouse device.This single chip can

interface three key-switches and four photo-couples direct to 8042. EM84502 can receive command and echo status or data format which are compatible with IBM PS/2 mode mouse. Key debouncing circuit is provided to prevent false entry and improve the accuracy.

FEATURES

• Being compatiable with PS/2 mouse mode.

• Built-in noise immunity circuit.

• Low power dissipation.

• RC oscillation.

• Three key-switches and four photo-couples inputs.

• Both key-press and key-release debounce interval 12 ms.

• Through three key-switches input, EM84502 can exert seven different output.

• The motion detector of the EM84502 could sense 8 m/sec maximun with 200 DPI wheels.

APPLICATIONS

• Optical mouse or pen-mouse.

• Mechanical mouse or pen-mouse.

• Optomechanical mouse or pen-mouse.

• Mechanical track ball.

• Optomechanical track ball.