ELAN EM83807 Datasheet
ALL-IN-ONE PLUG & PLAY 3-BUTTON SERIAL MOUSE CONTROLLER
GENERAL DESCRIPTION
The EM83807 Mouse Controller is specially designed to control serial mouse device.
This single chip can interface three key-switches and 4 X-Y photo-couples directly to RS-232C.
FEATURES
• Include PnP software scrolling function
• Using 50kΩ ±1% resistor for RC oscillation.
• Compatible with Microsoft serial 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.
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EM83807
APPLICATION
• Serial PnP mouse.
PIN ASSIGNMENT
V
OSC.OUT
NC
NC
RTS
RXD
OPT
VSS
EM83807
DD
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
OSCR
Y2
Y1
X2
X1
L
M
9
R
* This specification is subject to be changed without notice.
9.3.1999
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ALL-IN-ONE PLUG & PLAY 3-BUTTON SERIAL MOUSE CONTROLLER
FUNCTIONAL BLOCK DIAGRAM
OPT
X1
X2
Y1
Y2
L
M
R
C
D
O
M
E
M
O
T
P
T
E
A
I
C
R
O
T
A
N
O
T
R
O
R
D
E
B
O
U
N
C
E
OSCR
OSC.OUT
COUNTER
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MULTIPLEXER
COMMAND
& STATUS
OR PNP IO
SYSTEM CLOCK
GENERATOR
RC
OSCILLATION
EM83807
RXD
RTS
DATA
I/O
TIMING
CONTROLLER
PIN DESCRIPTIONS
Symbol I/O Function
OPT I/O INPUT: 200kΩ pull low to VSS.
When OPT is connected to VDD, EM84530 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 respectively.
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
100w (-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
L I/O
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
VSS Negative power.
VDD Power line.
* This specification is subject to be changed without notice.
9.3.1999
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ALL-IN-ONE PLUG & PLAY 3-BUTTON SERIAL MOUSE CONTROLLER
FUNCTION DESCRIPTIONS
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 only "M" key
status. 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 0 0 0 0
Plug & Play ID code
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EM83807
When RTS input from low to high, EM83810 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
Checks um 2 21, 15 2 bytes checks um
End PnP 1 09 End PnP ID
* This specification is subject to be changed without notice.
9.3.1999
3
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