Epson S5U1C88348T, Manual

Page: 75 / 78

6 CIRCUIT DIAGRAMS
S5U1C88348T HARDWARE MANUAL
EPSON
II-21
Fig. 6.7 Key Emulation Circuit for 88S5U1C88348T
CN? D-SUB25
pi
n
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
U? 7
4
HC154
A
23
B
22
C
21
D
20
G1
18
G2
19
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
13
12
14
13
15
14
16
15
17
U? 7
4
HC154
A
23
B
22
C
21
D
20
G1
18
G2
19
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
13
12
14
13
15
14
16
15
17
U? 7
4
HC125
1G
1
1A
2
1Y
3
2A
5
2G
4
3A
9
3G
10
4A
12
4G
13
2Y
6
3Y
8
4Y
11
GND
7
VCC
14
U? 7
4
HC125
1G
1
1A
2
1Y
3
2A
5
2G
4
3A
9
3G
10
4A
12
4G
13
2Y
6
3Y
8
4Y
11
GND
7
VCC
14
U?B 74HC21
9
10 12 13
8
J? Heade
r20pin
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
R? 10k
R? 10k
R? 10k
R? 10k
U?A 74HC21
1 2 4 5
6
R? 10k
U? 7
4
H
C4050
IN1
3
IN2
5
IN3
7
IN4
9
IN5
11
IN6
14
OUT1
2
OUT2
4
OUT3
6
OUT4
10
OUT5
12
OUT6
15
VCC
1
N.C.
13
GND
8
N.C.
16
U? 7
4
H
C4050
IN1
3
IN2
5
IN3
7
IN4
9
IN5
11
IN6
14
OUT1
2
OUT2
4
OUT3
6
OUT4
10
OUT5
12
OUT6
15
VCC
1
N.C.
13
GND
8
N.C.
16