Silan
Semiconductors
X1, X2, Y1, Y2 INPUT IMPEDANCE
UNIT:K
SC84502
16.0
15.0
14.0
13.0
12.0
11.0
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
MAX.
TYP.
MIN.
1.0
2.0
3.0
4.0
5.0
INPUT VOLTAGE
PIN DESCRIPTION
(refer to SC84502BP)
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
V
DD
OP
NC
NC
OSCOUT
CLK
DATA
V
SS
R
M
L
X1
X2
I/O
--
I
--
--
O
I/O
I/O
--
No Connection
No Connection
Clock output.
8042 auxiliary port CLK line.
8042 auxiliary port DATA line.
Negative Power Supply
Positive Power Supply.
X, Y inputs:
Description
Floating: Comparator input.
GND: Schmitt trigger input.
Short to OSC OUT: Testing Mode.
Three key-switches esert seven different combinations totally. Both key-pressed
and key-released signals will be sent accompanied with horizontal and vertical
I
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.
Four photo-couple signal denote UP, DOWN, LEFT and RIGHT state.
I
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.
50kΩ
±
5% pull low for 35kHz oscillation
Y1
Y2
OSCR
I
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
4
SILAN [ SILAN MICROELECTRONICS JOINT-STOCK ]
