EM83812

ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER

2

* This specification are subject to be changed without notice.

9.3.1999

Preliminary

Preliminary

Preliminary

Preliminary

Preliminary

FUNCTIONAL BLOCK DIAGRAM

PIN DESCRIPTIONS

OPT

I/O

INPUT: 200kohm pull low to VSS.

When OPT is connected to VDD, EM84520 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 with A/D/E/F version.

"1"= VDD, "0"= floating

High duty is about 60us.

OSC.OUT

O

The RC oscillation clock output. Or 3mA sink current output for X, Y photo

emitters.

OSCR

I

Connect 50k

Ω±1% precise resistor for oscillation.

RTS

I/O

±12V signal with 10mA driving. Used as PnP ID code output trigger signal

from 10w (-12V) to high (+12V) while under normal operating. RTS will keep on

±12V driving.

RXD

I/O

One report contains 4 data bytes, 7 data bits without parity in the data byte.

The data byte is sgifted out from LSB through MSB, started by start bit and ended

by stop bit. The RXD signal swing between +6V and -6V.

R

I

Three key-switches inputs. 200k

Ω resistor pull low.

M

I/O

In Z-axis key mode, M key toggling can change the scrolling speed from low to

L

I/O

high.

X1

I

Three step dynamic input impedance. If OSC.OUT is not connected to LEDs, the

X2

I

dynamic input impedance will be off.

Y1

I

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

Y2

I

Z1

I

Z-axis input.

Z2

I

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

Key mode : 200 k

Ω resistor pull low. 7 levels increased by "M" key.

Voltage mode : 200 k

Ω resistor pull low. 7 levels voltage comparator.

Mechanical mode : 13.2k

Ω resistor pull low. Current comparator input.

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

COMMAND

STATUS

SYSTEM CLOCK

GENERATOR

RC

OSCILLATION

MULTIPLEXER

DATA

I/O

TIMING

CONTROLLER

COMPARATOR VOLTAGE

SENSOR

KEY-SWITCH

DETECTOR

Z-AXIS COUNTER

THREE TYPES SELECTOR

RXD

RTS