GENERAL DESCRIPTION

The EM83702 Mouse Controller is specially designed to control mouse device. This single chip can interface three key-switches and four photo-couple direct to RS-232C. The EM83702 does not need any external power supply,so the mouse can go without a power line. It is versatile with both microsoft and mouse system.

Debouncing circuit were provided to prevent false entry and to improve the accuracy. In 1200 baud rate non-auto speed with 200 DPI wheels and photo-couples, the scanning is 650 mm/sec without missing a dot in microsoft mode,and the scanning speed can up to 770 mm/sec in mouse system mode.

FEATURES

• Built-in two zener diode between VDD and VSS, RTS and VDD.

• Buit-in noise immunity circuit.

• CMOS DIP 16 pins package & SOP 16 pins package.

• Low power dissipation.

• Use 32.768 kHz crystal or 3.58MHz resonator.

• Oscillator circuits on-chip.

• Serial output in 1200 baud rate.

• Can be powered directly from RS-232C.

• Can drive directly to RS-232C.

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

• Both key-in and key-release debounce interval 13 ms.

• Through three key-switches input, EM83702 can exert seven different output.

• The sampling rate of motion detector is 65 KHz.

APPLICATIONS

• Optical mouse or pen-mouse

• Mechanical mouse or pen-mouse

• Optomechanical mouse or pen-mouse

• Mechanical track ball

• Optomechanical track ball