Silan
Semiconductorsꢀ
SC84502
ꢀ
X1, X2, Y1, Y2 INPUT IMPEDANCE
UNIT:KΩ
MAX.
16.0
15.0
14.0
TYP.
13.0
12.0
MIN.
11.0
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
1.0
2.0
3.0
4.0
5.0
INPUT VOLTAGE
PIN DESCRIPTION
(refer to SC84502BP)
Pin No. Pin Name
I/O
Description
1
2
VDD
OP
--
Positive Power Supply.
X, Y inputs:
Floating: Comparator input.
GND: Schmitt trigger input.
Short to OSC OUT: Testing Mode.
I
3
4
5
6
7
8
NC
NC
--
--
O
No Connection
No Connection
Clock output.
OSCOUT
CLK
I/O 8042 auxiliary port CLK line.
I/O 8042 auxiliary port DATA line.
DATA
VSS
--
Negative Power Supply
Three key-switches esert seven different combinations totally. Both key-pressed
and key-released signals will be sent accompanied with horizontal and vertical
state. The status of the key-switches will be preserved, whenever the value of
horizontal or vertical counters will present at DATA. And the debounce interval for
both key-press and key release is 12ms.
9
R
M
L
I
10
11
12
13
14
15
16
X1
X2
Four photo-couple signal denote UP, DOWN, LEFT and RIGHT state.
During the scanning period, as long as the photo-couples change their states, the
value of vertical or horizontal, counter will increase or decrease accordingly.
I
I
Y1
Y2
OSCR
50kΩ ± 5% pull low for 35kHz oscillation
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
ꢀ
2000.12.31
Rev: 1.0
ꢀ
4
SILAN [ SILAN MICROELECTRONICS JOINT-STOCK ]
