EM84510

PS/2 SCROLLING MOUSE CONTROLLER

2

* This specification are subject to be changed without notice.

5.30.2001

FUNCTIONAL BLOCK DIAGRAM

PIN DESCRIPTIONS

OPT

I/O

INPUT: 200kohm pull low to VSS.

When OPT is connected to VDD, EM84510 will enter test mode. In test mode,

L will be the output of X1,while M will be the output of X2. Toggling R key can

change these output to be Y1,Y2 or Z1,Z2 respectively.

OUTPUT: 2kHz Z-axis LED driving source.

"1"= VDD, "0"= floating

High duty is about 60us.

OSC.OUT

O

RC mode oscillation with 51kohm resistor.

OSCR

I

CLK

I/O

Connect to 8042 auxiliary port CLK line.

DATA

I/O

Connect to 8042 auxiliary port DATA line.

R/M/L

I

Three key-switches inputs.

200kohm resistor pull low.

X1

I

Three step dynamic input impedance.

X2

Use current comparator to measure photo-couples "ON" ,or "OFF".

Y1

Y2

Z1

Z-axis inputs.

Z2

Photo mode: Three step dynamic input impedance. Current comparator input.

Key

mode: 200kohm resistor pull low. 7 levels increased by "M" key.

Voltage mode: 200kohm resistor pull low. 7 levels voltage comparator.

Mechanical mode : 13.2kohm resistor pull low.

VSS

Negative power.

VDD

Power line.

Symbol

I/O

Function

Z1

Z2

OPT

X1

X2

Y1

Y2

L

M

R

OSCR

OSC.OUT

C

O

M

P

A

R

A

T

O

R

M

O

T

I

O

N

D

E

T

E

C

T

O

R

D

E

B

O

U

N

C

E

COUNTER

COMMON

STATUS

SYSTEM CLOCK

GENERATOR

RC

OSCILLATION

MULTIPLEXER

DATA

I/O

TIMING

CONTROLLER

COMPARATOR

VOLTAGE

SENSOR

KEY-SWITCH

DETECTOR

Z-AXIS COUNTER

THREE TYPES SELECTOR

DATA CLK