EM84502BP Ver la hoja de datos (PDF) - ELAN Microelectronics

Número de pieza

componentes Descripción

Fabricante

EM84502BP

PS/2 MOUSE CONTROLLER

ELAN Microelectronics 

EM84502

PS/2 MOUSE CONTROLLER

FUNCTIONAL BLOCK DIAGRAM

OP

X1

X2

Y1

Y2

L

M

R

OSCR

OSC OUT

D

ME

OT

TE

IC

OT

NO

R

I

NM

OM

IU

SN

E IT

Y

D

E

B

O

U

N

C

E

COUNTER

TIMING

CONTROLLER

SYSTEM

CLOCK

GENERATOR

C

O CD

N OE

D V MC

A E MO

T R AD

A T NE

E DR

R

DATA

I/O

DATA

CLK

PIN DESCRIPTIONS

Symbol

I/O

VDD

OP

I

OSCOUT

O

CLK

I/O

DATA

I/O

VSS

R

I

M

L

X1

I

X2

Y1

Y2

OSCR

I

Function

Power

X, Y inputs.

Floating : Comparator input.

GND : Schmitt trigger input.

Short to OSC OUT : Testing Mode.

Clock output.

8042 auxiliary port CLK line.

8042 auxiliary port DATA line.

Ground

Three key-switches exert seven different combinations totally. Both key-pressed

and key-released signals will be sent accomplanied with horizontal and vertical

state. The status of the key-switches will be preserved, whenever the value of

horizontal or vertical counters will present at DATA. And the debounce interval

for both key-press and key-release is 12 ms.

Four photo-couple signals denote UP, DOWN, LEFT, and RIGHT state.

During the scaning period, as long as the photo-couples change their states, the

value of vertical or horizontal counter will increase or decrease accordingly.

30 Kohm ±5% pull low for 35 KHz oscillation.

FUNCTION DESCRIPTIONS

A) Operating mode

There are four operating modes in PS/2 mouse:

i). Reset Mode:

In this mode a self-test is initiated during power-on or by a Reset command. After reset signal, PS/2

mouse will send:

1). Completion code AA & ID code 00.

* This specification are subject to be changed without notice.

6.18.1998 2

Share Link: