EMC EM83812AP All-inone plug & play scrlling serial mouse controller Datasheet

EM83812
ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER
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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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APPLICATION
• Serial PnP scrolling mouse.
PIN ASSIGNMENT
EM83812A/B/C/D/E/FP
VDD
OSC.OUT
Z1
Z2
RTS
RXD
OPT
VSS
1
2
3
4
5
6
7
8
* This specification are subject to be changed without notice.
16
15
14
13
12
11
10
9
OSCR
Y2
Y1
X2
X1
L
M
R
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EM83812
ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER
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FUNCTIONAL BLOCK DIAGRAM
THREE TYPES SELECTOR
COMPARATOR VOLTAGE KEY-SWITCH
SENSOR
DETECTOR
Z1
Z2
RXD
RTS
Z-AXIS COUNTER
C
O
M
P
A
R
A
T
O
R
OPT
X1
X2
Y1
Y2
L
M
R
D
ME
OT
TE
IC
OT
NO
R
D
E
B
O
U
N
C
E
COUNTER
MULTIPLEXER
COMMAND
STATUS
DATA
I/O
TIMING
CONTROLLER
SYSTEM CLOCK
GENERATOR
OSCR
OSC.OUT
RC
OSCILLATION
PIN DESCRIPTIONS
Symbol
I/O
OPT
I/O
OSC.OUT
O
OSCR
RTS
I
I/O
RXD
I/O
R
M
L
X1
X2
Y1
Y2
Z1
Z2
I
I/O
I/O
I
I
I
I
I
I
VSS
VDD
Function
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.
The RC oscillation clock output. Or 3mA sink current output for X, Y photo
emitters.
Connect 50kΩ±1% precise resistor for oscillation.
±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.
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. 200kΩ resistor pull low.
In Z-axis key mode, M key toggling can change the scrolling speed from low to
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 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.
Negative power.
Power line.
* This specification are subject to be changed without notice.
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ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER
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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
2nd byte
3rd byte
4th byte
......
......
....
....
....
6
1
0
0
0
5
L
H5
V5'
0
4
R
H4
V4'
M
3
V7'
H3
V3'
Z3
2
V6'
H2
V2'
Z2
1
H7
H1
V1'
Z1
0
H6
H0
V0'
Z0
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
Other ID
Begin ID
PnP Revision
EISA ID
Product ID
Serial Number
Class ID
Driver ID
User Name
Length
<17
1
2
3
4
9
<34
<42
<42
Check sum
End PnP
2
1
Field Data
4D, 5A, 40, 00, 00, 00
08
01, 24
25, 2D, 23
10, 10, 10, 11
3C
3C, 2D, 2F, 35, 33, 25
3C, 30, 2E, 30, 10 26, 10, 21
3C, 25, 2D, 23, 00, 33, 23, 32,
2F, 2C, 2C, 29, 2E, 27, 00, 33,
25, 32, 29, 21, 2C, 00, 2D, 2F,
35, 33, 25
21, 15
09
Description
ID for legacy
Begin PnP ID
Version 1.00
EMC
0001
None provided
Mouse Class
PnP0F0A
EMC SCROLLING
SERIAL MOUSE
2 bytes checks um
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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ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER
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Value
1
2
3
4
5
6
7
Rate per second
2.7
6.4
9.2
12.8
15
18
20
(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
0
1
2
3
4
5
6
7
Under VDD=5V condition.
Voltage
1V↓
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↑
(e) Mechanical mode : The same as optical wheel mode.
* This specification are subject to be changed without notice.
9.3.1999
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EM83812
ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER
ABSOLUTE MAXIMUM RATINGS
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Parameter
Temperature under bias
Storage temperature range
Supply voltage
Power dissipation
Ratings
Unit
Min.
0
-65
-0.3
-
Max.
70
150
7.5
500
°C
°C
V
mW
DC ELECTRICAL CHARACTERISTICS (TA=25°C to 70°C, Vds=5.6V))
Parameters
Operating voltage
Operating current
(Vdd=5.4, RTS=Vdd)
Operating current
(Vdd=6.2, RTS=Vdd)
RTS Operating current
(Vdd=5.6, RTS=11V)
RTS operating current
(Vdd=5.6, RTS=12V)
RXD high output voltage
(Vrh=Vrts=2.6V)
RXD low output voltage
(Vrh=Vss+2.6V)
RTS high input voltage
RTS low input voltage
X1,X2,Y1,Y2,Z1,Z2 (photo mode)
low input reference current
X1,X2,Y1,Y2,Z1,Z2 (photo mode)
high input reference current
X1,X2,Y1,Y2,Z1,Z2 (photo mode)
input current
(input impedance) (80µA)
X1,X2,Y1,Y2,Z1,Z2 (photo mode)
input current
(input impedance) (500µA)
L,M,R,OPT,Z1,Z2 (key mode)
input low voltage
Z1,Z2 (key mode)
input high voltage
Z1,Z2 (voltage mode)
sensitivity
L,M,R,Z1,Z2 (key & voltage mode)
input current
(Vds=5.6V)
OPT
input current
OPT
high output current
(Iopt=20mA)
L,M,R,X1,X2,Y1,Y2,Z1,Z2
input leakage current
(Vds=0V)
OPT
input leakage current
(Vds=5.6V)
Sym.
Min.
Typ.
Max.
Unit
Vdd
Vrts
Iop1
4.5
-
6
12
-
6.5
13
0.8
V
V
mA
Iop2
3
-
-
mA
Irts1
-
-
1.8
mA
Irts2
Irh
4
2
-
-
mA
mA
Irl
-
-
-2
mA
9.6
70
-
6.8
-
V
V
µA
-
-
106
µA
Vpl1
0.8
-
1.2
V
Vpl2
1.5
-
2.1
V
Vail
-
-
1.5
V
Vaih
3.5
-
-
V
Vs
-0.3
-
+0.3
V
Imi
18
-
56
µA
Ixi
-18
-
-56
µA
Idc
4.5
-
-
V
Iil
0
-
-1.0
µA
Iih
0
-
1.0
µA
Vrts+
VrtsIpl
Iph
* All voltage in above table are compared with VSS.
* This specification are subject to be changed without notice.
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ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER
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AC ELECTRICAL CHARACTERISTICS (TA=0°C to 70°C)
Parameters
Oscillating Frequency
Key Debounce
Transnission time
Start bit time
Data bit time
Stop bit time
Mode code delay time
Rising Edge Crossed Wid
Falling Edge Crossed Wid
* This specification are subject to be changed without notice.
Sym.
Min.
Typ.
Max.
Unit
Fosc
Tkd
Tmx
Ts
Td
Tp
Trd
Tr
Tf
-3.3%
11
15.4
15.4
32.40
13
33.33
833.3
833.3
833.3
-
+3.3%
.
14
-
KHz
ms
ms
us
us
us
ms
us
us
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ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER
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TIMING DIAGRAM
(A) RXD output :
Key in/release
Mouse RXD
Tmx
Tmx
(B) Bytes structure :
RXD
1st
2rd
3nd
4nd
(C) Bits structure :
RXD LINE
Data Bit no.
0
Ts Td
1
2
Td Td
4
5
6
Td Td
3
Td
Td
TP Tp
0 1
(D) PnP ID code echo timing :
RTS
><
Trd
RXD
4D 5A 40 00 00
"4D" code
Bit no
Ts 0
1
2
* This specification are subject to be changed without notice.
PnP ID code
00 08
3
4
5
09
Tp Tp
9.3.1999
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DTR
SG
DSR
RTS
RXD
TXD
5
6
7
8
9
3
4
1
2
* This specification are subject to be changed without notice.
50K*
8 V
SS
16 OSCR
R
M
L
Z1
Z2
X1
EM83812AP
EM83812EP 1KΩ
OSC.OUT
7 OPT
2
2 chips analog PT
4 chips digital PT
9
10
11
3
4
12
13
X2
6 RXD
Y2 15
Y1 14
VDD
RTS
5
1
* 50 kΩ must be precise resistor under ±1%
5.1V
1KΩ
0.1µF
10µF
EM83812
ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER
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APPLICATION CIRCUIT
9.3.1999
8
RXD
TXD
DTR
SG
DSR
RTS
3
4
5
6
7
8
9
1
2
* This specification are subject to be changed without notice.
50K*
RTS
VDD
8 V
SS
EM83812BP
16 OSCR
OSC.OUT
7 OPT
2
6 RXD
5
1
1KΩ
R
M
L
Z1
Z2
X1
X2
Y1
Y2
* 50 kΩ must be precise resistor under ±1%
5.1V
2 chips analog PT
4 chips digital PT
9
10
11
3
4
12
13
14
15
0.1µF
10µF
EM83812
ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER
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9.3.1999
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RTS
DTR
SG
DSR
RXD
TXD
6
7
8
9
3
4
5
1
2
5.1V
* This specification are subject to be changed without notice.
8 V
SS
EM83812CP
16 OSCR
OSC.OUT
7 OPT
2
1KΩ
R
M
L
Z1
Z2
X1
X2
Y1
Y2
2 chips analog PT
4 chips digital PT
9
10
11
3
4
12
13
14
15
* 50 kΩ must be precise resistor under ±1%
50K*
RTS
VDD
6 RXD
5
1
0.1µF
10µF
EM83812
ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER
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9.3.1999
10
RTS
RXD
TXD
DTR
SG
DSR
1
2
3
4
5
6
7
8
9
* This specification are subject to be changed without notice.
50K*
8 V
SS
EM83812DP
EM83812FP
16 OSCR
OSC.OUT
7 OPT
2
1KΩ
R
M
L
Z1
Z2
X1
**
COM
4 chips digital PT
B
A
2 chips analog PT
9
10
11
3
4
12
13
X2
6 RXD
Y2 15
Y1 14
VDD
RTS
5
1
* 50 kΩ must be precise resistor under ±1%
** Mechanical wheel
5.1V
0.1µF
10µF
EM83812
ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER
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9.3.1999
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