EM83812

ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER

* This specification are subject to be changed without notice.

9.3.1999

Preliminary

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.

PIN ASSIGNMENT

OSC.OUT

RTS

RXD

OPT

VSS

OSCR

EM83812A/B/C/D/E/FP

EM83812

ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER

* This specification are subject to be changed without notice.

9.3.1999

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

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

OSCR

Connect 50k

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.

Three key-switches inputs. 200k

resistor pull low.

I/O

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

I/O

high.

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

dynamic input impedance will be off.

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

Z-axis input.

Photo mode : Three steps dynamic input impedance. Current comparator input.
Key mode : 200 k

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

Voltage mode : 200 k

resistor pull low. 7 levels voltage comparator.

Mechanical mode : 13.2k

resistor pull low. Current comparator input.

VSS

Negative power.

VDD

Power line.

Symbol

I/O

Function

Z1
Z2

OPT

OSCR

OSC.OUT

C
O

A
R
A

O
R

O
N

E
T
E
C
T

O
R

E
B

O
U
N
C

COUNTER

COMMAND

STATUS

SYSTEM CLOCK

GENERATOR

OSCILLATION

MULTIPLEXER

DATA

I/O

TIMING

CONTROLLER

COMPARATOR VOLTAGE

SENSOR

KEY-SWITCH

DETECTOR

Z-AXIS COUNTER

THREE TYPES SELECTOR

RXD

RTS

EM83812

ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER

* This specification are subject to be changed without notice.

9.3.1999

Preliminary

FUNCTION DESCRIPTIONS

(I) Serial Scrolling Mouse :

In Microsoft mode, the transmission cycle consists of four bytes in one report. Each byte contains one start
bit, 7 data bits and two stop bits. The first byte contains "L", "R" key status and four bits of the two most
significant bits in horizontal counter and vertical counter. The second byte represents the value accumulated
by horizontal counter, the third byte is the data of the vertical counter. The last byte contains "M" key status
and Z-axis value. The vertical data is transmitted in 2's complement.

Output byte arrange

Bit no.

......

1st byte

......

V7'

V6'

2nd byte

....

3rd byte

....

V5'

V4'

V3'

V2'

V1'

V0'

4th byte

....

Plug & Play ID code

When RTS input from low to high, EM84520 will send a string ID code. Customer can specify the contains
of the code area and the total lenth below 100 bytes by changing the code layer.

Field Name

Length

Field Data

Description

Other ID

<17

4D, 5A, 40, 00, 00, 00

ID for legacy

Begin ID

Begin PnP ID

PnP Revision

01, 24

Version 1.00

EISA ID

25, 2D, 23

EMC

Product ID

10, 10, 10, 11

0001

Serial Number

None provided

Class ID

<34

3C, 2D, 2F, 35, 33, 25

Mouse Class

Driver ID

<42

3C, 30, 2E, 30, 10 26, 10, 21

PnP0F0A

User Name

<42

3C, 25, 2D, 23, 00, 33, 23, 32,

EMC SCROLLING

2F, 2C, 2C, 29, 2E, 27, 00, 33,

SERIAL MOUSE

25, 32, 29, 21, 2C, 00, 2D, 2F,
35, 33, 25

Check sum

21, 15

2 bytes checks um

End PnP

End PnP ID

(II). Z-axis Input Function :

(a) Photo couples input : Z-axis counter accumulates the Z1, Z2 phase changed by movement.

(b) Key-switches input : Pressing Z1, Z2 will start to fill the Z-axis counter with the value beginning at one.

Toggling "M" key can increase the value any time by one. The limit value is

EM83812

ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER

* This specification are subject to be changed without notice.

9.3.1999

Preliminary

Value

Rate per second

2.7

6.4

9.2

12.8

(d) Voltage-sensing mode : There are 7 voltage levels in Z1, Z2 input. The transmission table is the same as

key-switches mode. The relationship between the value of Z-axis counter and the voltage as folllows :

Value

Voltage

1.0V-1.6V

1.6V-2.2V

2.2V-2.8V

2.8V-3.4V

3.4V-4.0V

4.0V-4.6V

4.6V

Under V

=5V condition.

(e) Mechanical mode : The same as optical wheel mode.

EM83812

ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER

* This specification are subject to be changed without notice.

9.3.1999

Preliminary

Operating voltage

Vdd

4.5

6.5

Vrts

Operating current

Iop1

0.8

(Vdd=5.4, RTS=Vdd)

Operating current

Iop2

(Vdd=6.2, RTS=Vdd)

RTS Operating current

Irts1

1.8

(Vdd=5.6, RTS=11V)

RTS operating current

(Vdd=5.6, RTS=12V)

Irts2

RXD high output voltage

Irh

(Vrh=Vrts=2.6V)

RXD low output voltage

Irl

-2

(Vrh=Vss+2.6V)

RTS high input voltage

Vrts+

9.6

RTS low input voltage

Vrts-

6.8

X1,X2,Y1,Y2,Z1,Z2 (photo mode)

Ipl

low input reference current
X1,X2,Y1,Y2,Z1,Z2 (photo mode)

Iph

106

high input reference current
X1,X2,Y1,Y2,Z1,Z2 (photo mode)

Vpl1

0.8

1.2

input current

(input impedance) (80

X1,X2,Y1,Y2,Z1,Z2 (photo mode)

Vpl2

1.5

2.1

input current

(input impedance) (500

L,M,R,OPT,Z1,Z2 (key mode)

Vail

1.5

input low voltage
Z1,Z2 (key mode)

Vaih

3.5

input high voltage
Z1,Z2 (voltage mode)

-0.3

+0.3

sensitivity
L,M,R,Z1,Z2 (key & voltage mode)

Imi

input current

(Vds=5.6V)

OPT

Ixi

-18

-56

input current
OPT

Idc

4.5

high output current

(Iopt=20mA)

L,M,R,X1,X2,Y1,Y2,Z1,Z2

Iil

-1.0

input leakage current

(Vds=0V)

OPT

Iih

1.0

input leakage current

(Vds=5.6V)

DC ELECTRICAL CHARACTERISTICS (T

=25

C to 70

C, Vds=5.6V))

Parameters

Sym.

Min.

Typ.

Max.

Unit

ABSOLUTE MAXIMUM RATINGS

Parameter

Ratings

Unit

Min.

Max.

Temperature under bias

Storage temperature range

-65

150

Supply voltage

-0.3

7.5

Power dissipation

500

* All voltage in above table are compared with VSS.

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