GENERAL DESCRIPTION

The EM83812 PnP Scrolling Mouse Controller is specially designed to control serial mouse device.

This single chip can interface three key-switches and 4 X-Y photo-couples plus Z-axis directly to RS-232C.

There are four types Z-axis inputs used to implement scrolling mouse functionality.

FEATURES

? Using 50k? ±1 resistor for RC oscillation.

? Compatible with Microsoft serial scrolling mouse.

? 100 bytes PnP ID code could be filled by code layer.

? Built-in noise immunity circuit.

? The sampiling rate of motion detector is up to 65KHz.

? Built-in three zener diodes : one in VDD to VSS, two in RTS to VDD.

? CMOS push-pull RXD output.

? Built-in current comparator for photo-couples input.

? Built-in three step dynamic input impedance.

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

? RTS debouncing circuit included.

? Photo couple test mode included.

? Low power dissipation.

? Six types Z direction input:

1. Photo couples input. (Z/1) 4. Mechanical input. (Z/1)

2. Key-switches input. 5. Photo couples input. (Z/4)

3. Voltage-sensing input. 6. Mechanical input. (Z/2)

? Package type:

EM83812AP : 16DIP, Photo couples input. (Z/1) EM83812DP: 16DIP, Mechanical input. (Z/1)

EM83812BP : 16DIP, Key-switches input. EM83812EP : 16DIP, Photo couples input. (Z/4)

EM83812CP : 16DIP, Voltage-sensing input. EM83812FP : 16DIP, Mechanical input. (Z/2)

APPLICATION

? Serial PnP scrolling mouse.