Datasheet

11
FN3093.3
FIGURE 10. DRIVING LCD DISPLAYS
FIGURE 11. LM311 CLOCK SOURCE FIGURE 12. GENERATING A NEGATIVE SUPPLY FROM +5V
20
28
27
26
25
24
23
22
21
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
REF
-5V
ANALOG
27Ω
0.47µF
1µF
100kΩ
INPUT
+5V
ICL7135
CD4054A
120kC = 3 READINGS/SEC
CLOCK IN
BACKPLANE
4
1
/
2
DIGIT LCD DISPLAY
28 SEGMENTS D1-D4
OPTIONAL
2,3,4
ICM7211A
300pF
0V
22-100pF
VOLTAGE
GND
CAPACITOR
6-26
V-
REF
ANALOG
INT OUT
AZ
IN
BUF OUT
RC1
RC2
INPUT LO
INPUT HI
V+
D5
B1
B2
37-40
OSC 36
V+ 1
UR
OR
STROBE
R/H
DIG. GND
POL
CLOCK
BUSY
D1
D2
D3
D4
B8
B4
1
31 D1
32 D2
33 D3
34 D4
30 B3
29 B2
28 B1
27 B0
35 V-
16151412 5 3 4
7 8 131110 9 2 6
+5V
+5V
+5V
0.1µF
1µF
100kΩ
COMMON
5BP
100kΩ
0.22µF
16kΩ
56kΩ
+5V
1kΩ
30kΩ
390pF
1
3
4
8
7
16kΩ
LM311
+
2
-
1
2
3
4
7
6
5
8
10µF
-
+
+5V
V
OUT
= -5V
ICL7660
10µF
-
+
ICL7135