EM83812
ALL-INONE PLUG & PLAY SCRLLING SERIAL MOUSE CONTROLLER
FUNCTIONAL BLOCK DIAGRAM
THREE TYPES SELECTOR
RXD
Z1
Z2
VOLTAGE
SENSOR
KEY-SWITCH
DETECTOR
COMPARATOR
RTS
Z-AXIS COUNTER
C
O
M
P
A
R
A
T
O
R
OPT
X1
D
E
T
E
C
T
O
R
M
O
T
I
O
N
DATA
I/O
COUNTER
MULTIPLEXER
X2
Y1
Y2
D
E
B
O
U
N
C
E
L
M
COMMAND
STATUS
TIMING
CONTROLLER
R
SYSTEM CLOCK
GENERATOR
OSCR
OSC.OUT
RC
OSCILLATION
PIN DESCRIPTIONS
Symbol
I/O
Function
INPUT: 200kohm pull low to VSS.
OPT
I/O
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
RTS
I
I/O
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.
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. 200kΩ resistor pull low.
In Z-axis key mode, M key toggling can change the scrolling speed from low to
high.
R
M
L
I
I/O
I/O
X1
X2
Y1
Y2
Z1
Z2
I
I
I
I
I
I
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.
VSS
VDD
Power line.
9.3.1999
* This specification are subject to be changed without notice.
2
ELAN [ ELAN MICROELECTRONICS CORP ]
