ICL8052A/ICL71C03, ICL8068A/ICL71C03
1
4 / DIGIT LCD DISPLAY
2
28 SEGMENTS
- D
D
1
4
+5V
116 151412 5
CD4054A
3
2
4
6
BACKPLANE
7
8 1311 10 9
0V
ICM7211A
5 BP
ICL71C03
+5V
V+
1
2
BUSY 28
31 D
1
41/2 / 31/2
POL
D
D
D
D
B
B
B
B
D
27
26
25
24
23
22
21
20
19
1
2
3
4
8
4
2
1
5
32 D
2
3
33 D
34 D
3
4
R/H
4
2, 3, 4
6 - 26
37 - 40
COMP IN
V-
5
30 B
29 B
28 B
27 B
-15V
6
3
2
1
0
OPTIONAL
CAPACITOR
REF
7
+5V
OSC 36
V+ 1
REF. CAP. 1
REF. CAP. 2
INPUT
8
1µF
100kΩ
22-100pF
9
10
11
12
13
14
INPUT
35 V-
0.1µF
ANALOG GND
CLOCK
UR
STROBE 18
A-Z IN 17
+5V
0V
A-Z OUT 16
DIG GND 15
OR
0V
CLOCK IN (120kHz = 3 READINGS/SEC)
1.0µF
-15V
1
2
3
4
5
6
7
14
13
0.22µF
300µF
36kΩ
12
11
10
9
ICL8052A
8068A
300kΩ
100kΩ
-15V
5kΩ
10kΩ
+15V
8
10µF
ANALOG GND
FIGURE 10. DRIVING LCD DISPLAYS
15
ETC [ ETC ]
