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* This specification is subject to be changed without notice.

9.3.1999

Preliminary

Preliminary

Preliminary

Preliminary

Preliminary

EM83807

ALL-IN-ONE PLUG & PLAY 3-BUTTON SERIAL MOUSE CONTROLLER

GENERAL DESCRIPTION

The EM83807 Mouse Controller is specially designed to control serial mouse device.

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

FEATURES

• Include PnP software scrolling function

• Using 50k

Ω ±1% resistor for RC oscillation.

• Compatible with Microsoft serial 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.

APPLICATION

• Serial PnP mouse.

PIN ASSIGNMENT

OSC.OUT

NC

NC

RTS

RXD

OPT

VSS

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

OSCR

Y2

Y1

X2

X1

L

M

R

EM83807