EM84520DP Ver la hoja de datos (PDF) - ELAN Microelectronics
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EM84520DP Datasheet PDF : 19 Pages
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FUNCTIONAL BLOCK DIAGRAM
EM84520
2-IN-ONE SCROLLING MOUSE CONTROLLER
Preliminary
Z1
Z2
OPT
X1
X2
Y1
Y2
L
M
R
C
O
M
P
A
R
A
T
O
D
ME
OT
TE
IC
OT
NO
R
R
D
E
B
O
U
N
C
E
THREE TYPES SELECTOR
COMPARATOR VOLTAGE KEY-SWITCH
SENSOR DETECTOR
Z-AXIS COUNTER
DATA/RXD
CLK/RTS
COUNTER
MULTIPLEXER
DATA
I/O
COMMAND
STATUS
TIMING
CONTROLLER
OSCR
OSC.OUT
SYSTEM CLOCK
GENERATOR
RC
OSCILLATION
PIN DESCRIPTIONS
Symbol
I/O
OPT
I/O
OSC.OUT
O
OSCR
I
CLK/RTS
I/O
DATA/RXD
I/O
R
I
M
I/O
L
I/O
X1
I
X2
I
Y1
I
Y2
I
Z1
I
Z2
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.
Connect to 8042 auxiliary port CLK line in PS/2 mode or connect directly to RS-
232C RTS pin in serial mode. Auto-detect the operating port by this pin.
Connect to 8042 auxiliary port DATA line in PS/2 mode or connect directly to RS-
232C RXD pin in serial mode.
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.
6.28.1999 2
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