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ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER
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 50kΩ ±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)
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EM83812
APPLICATION
• Serial PnP scrolling mouse.
PIN ASSIGNMENT
EM83812A/B/C/D/E/FP
V
DD
Z1
Z2
RTS
RXD
OPT
VSS
1
2
3
4
5
6
7
8
OSC.OUT
* This specification are subject to be changed without notice.
16
OSCR
15
Y2
14
Y1
13
X2
12
X1
11
L
10
M
9
R
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ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER
FUNCTIONAL BLOCK DIAGRAM
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EM83812
OPT
Z1
Z2
C
D
O
M
E
M
X1
X2
Y1
Y2
L
M
R
O
P
T
A
I
R
O
A
N
T
O
R
D
E
B
O
U
N
C
E
OSCR
OSC.OUT
T
E
C
T
O
R
THREE TYPES SELECTOR
COMPARATOR
Z-AXIS COUNTER
COUNTER
SYSTEM CLOCK
GENERATOR
OSCILLATION
VOLTAGE
SENSOR
COMMAND
STATUS
RC
KEY-SWITCH
DETECTOR
MULTIPLEXER
RXD
RTS
DATA
I/O
TIMING
CONTROLLER
PIN DESCRIPTIONS
Symbol I/O Function
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 50kΩ±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. 200kΩ 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 kΩ resistor pull low. 7 levels increased by "M" key.
Voltage mode : 200 kΩ resistor pull low. 7 levels voltage comparator.
Mechanical mode : 13.2kΩ resistor pull low. Current comparator input.
VSS Negative power.
VDD Power line.
* This specification are subject to be changed without notice.
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ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER
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. ...... 654321 0
1st byte ...... 1 L R V7' V6' H7 H6
2nd byte .... 0 H5 H4 H3 H2 H1 H0
3rd byte .... 0 V5' V4' V3' V2' V1' V0'
4th byte .... 0 0 M Z3 Z2 Z1 Z0
Plug & Play ID code
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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 1 08 Begin PnP ID
PnP Revision 2 01, 24 Version 1.00
EISA ID 3 25, 2D, 23 EMC
Product ID 4 10, 10, 10, 11 0001
Serial Number 9 3C 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 2 21, 15 2 bytes checks um
End PnP 1 09 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 ±7.
(c) The relationship between the value and the transmission rate as follows :
* This specification are subject to be changed without notice.
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Value Rate per second
1 2.7
2 6.4
3 9.2
4 12.8
515
618
720
(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
01V↓
1 1.0V-1.6V
2 1.6V-2.2V
3 2.2V-2.8V
4 2.8V-3.4V
5 3.4V-4.0V
6 4.0V-4.6V
74.6V↑
Under V
=5V condition.
DD
(e) Mechanical mode : The same as optical wheel mode.
* This specification are subject to be changed without notice.
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ABSOLUTE MAXIMUM RATINGS
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Parameter Ratings Unit
Min. Max.
Temperature under bias 0 70 °C
Storage temperature range -65 150 °C
Supply voltage -0.3 7.5 V
Power dissipation - 500 mW
DC ELECTRICAL CHARACTERISTICS (TA=25°C to 70°C, Vds=5.6V))
Parameters Sym. Min. Typ. Max. Unit
Operating voltage Vdd 4.5 6 6.5 V
Vrts - 12 13 V
Operating current Iop1 - - 0.8 mA
(Vdd=5.4, RTS=Vdd)
Operating current Iop2 3 - - mA
(Vdd=6.2, RTS=Vdd)
RTS Operating current Irts1 - - 1.8 mA
(Vdd=5.6, RTS=11V)
RTS operating current (Vdd=5.6, RTS=12V) Irts2 4 - - mA
RXD high output voltage Irh 2 - - mA
(Vrh=Vrts=2.6V)
RXD low output voltage Irl - - -2 mA
(Vrh=Vss+2.6V)
RTS high input voltage Vrts+ 9.6 - - V
RTS low input voltage Vrts- - - 6.8 V
X1,X2,Y1,Y2,Z1,Z2 (photo mode) Ipl 70 - - µA
low input reference current
X1,X2,Y1,Y2,Z1,Z2 (photo mode) Iph - - 106 µA
high input reference current
X1,X2,Y1,Y2,Z1,Z2 (photo mode) Vpl1 0.8 - 1.2 V
input current (input impedance) (80µA)
X1,X2,Y1,Y2,Z1,Z2 (photo mode) Vpl2 1.5 - 2.1 V
input current (input impedance) (500µA)
L,M,R,OPT,Z1,Z2 (key mode) Vail - - 1.5 V
input low voltage
Z1,Z2 (key mode) Vaih 3.5 - - V
input high voltage
Z1,Z2 (voltage mode) Vs -0.3 - +0.3 V
sensitivity
L,M,R,Z1,Z2 (key & voltage mode) Imi 18 - 56 µA
input current (Vds=5.6V)
OPT Ixi -18 - -56 µA
input current
OPT Idc 4.5 - - V
high output current (Iopt=20mA)
L,M,R,X1,X2,Y1,Y2,Z1,Z2 Iil 0 - -1.0 µA
input leakage current (Vds=0V)
OPT Iih 0 - 1.0 µA
input leakage current (Vds=5.6V)
* All voltage in above table are compared with VSS.
* This specification are subject to be changed without notice.
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EM83812
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AC ELECTRICAL CHARACTERISTICS (TA=0°C to 70°C)
Parameters Sym. Min. Typ. Max. Unit
Oscillating Frequency Fosc -3.3% 32.40 +3.3% KHz
Key Debounce Tkd - 13 - ms
Transnission time Tmx - 33.33 . ms
Start bit time Ts - 833.3 - us
Data bit time Td - 833.3 - us
Stop bit time Tp - 833.3 - us
Mode code delay time Trd 11 - 14 ms
Rising Edge Crossed Wid Tr 15.4 - - us
Falling Edge Crossed Wid Tf 15.4 - - us
* This specification are subject to be changed without notice.
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TIMING DIAGRAM
(A) RXD output :
Key in/release
Mouse RXD
(B) Bytes structure :
RXD
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ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER
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Tmx Tmx
1st 2rd 3nd 4nd
(C) Bits structure :
RXD LINE
Data Bit no.
Ts Td Td Td Td Td Td Td TP Tp
(D) PnP ID code echo timing :
RTS
<
>
Trd
RXD
4D 5A 40 00 00 00 08
0
1 2 3456
0 1
PnP ID code 09
"4D" code
Bit no
* This specification are subject to be changed without notice.
Ts012345Tp Tp
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ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER
15
13
12
4
3
11
10
9
OSCR
V
SS
DD
V
RTS
RXD
OPT
OSC.OUT
16
1
5
6
782
14
Y2
Y1
X2
X1
L
M
R
EM83812AP
EM83812EP
10µF
0.1µF
1
2
3
4
5
6
7
8
9
Z2
Z1
50K*
1KΩ
1KΩ
5.1V
RXD
TXD
DTR
SG
DSR
RTS
4 chips digital PT
2 chips analog PT
APPLICATION CIRCUIT
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* 50 kΩ must be precise resistor under ±1%
* This specification are subject to be changed without notice.
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EM83812
15
13
12
4
3
11
10
9
OSCR
V
SS
DD
V
RTS
RXD
OPT
OSC.OUT
16
1
5
6
782
14
Y2
Y1
X2
X1
L
M
R
EM83812BP
10µF
0.1µF
1
2
3
4
5
6
7
8
9
Z2
Z1
50K*
RXD
TXD
DTR
SG
DSR
RTS
5.1V
4 chips digital PT
2 chips analog PT
1KΩ
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* 50 kΩ must be precise resistor under ±1%
* This specification are subject to be changed without notice.
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ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER
15
13
12
4
3
11
10
9
OSCR
V
SS
DD
V
RTS
RXD
OPT
OSC.OUT
16
1
5
6
782
14
Y2
Y1
X2
X1
L
M
R
EM83812CP
10µF
0.1µF
1
2
3
4
5
6
7
8
9
Z2
Z1
50K*
RXD
TXD
DTR
SG
DSR
RTS
5.1V
4 chips digital PT
2 chips analog PT
1KΩ
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* 50 kΩ must be precise resistor under ±1%
* This specification are subject to be changed without notice.
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EM83812
15
13
12
4
3
11
10
9
OSCR
V
SS
DD
V
RTS
RXD
OPT
OSC.OUT
16
1
5
6
782
14
Y2
Y1
X2
X1
L
M
R
EM83812DP
EM83812FP
10µF
0.1µF
1
2
3
4
5
6
7
8
9
Z2
Z1
50K*
RXD
TXD
DTR
SG
DSR
RTS
A
B
COM
**
5.1V
4 chips digital PT
2 chips analog PT
1KΩ
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** Mechanical wheel
* 50 kΩ must be precise resistor under ±1%
* This specification are subject to be changed without notice.
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