hi7131 Intersil Corporation, hi7131 Datasheet - Page 18

• Manufacturer Part Number: hi7131
• Description: 3 1/2 Digit, Low Power, High Cmrr, Lcd/led Display-type A/d Converters
• Manufacturer: Intersil Corporation

Typical Applications
FIGURE 104B. CIRCUIT FOR DEVELOPING UNDERRANGE AND OVERRANGE SIGNALS FROM HI7133 OUTPUTS
FIGURE 104A. HI7131 AND HI7133 MEASURING RATIOMETRIC VALUES OF QUAD LOAD CELL
The LM339 is required to ensure
logic compatibility with heavy dis-
play loading.
U /RANGE
O /RANGE
CD4023 OR
(Continued)
74C10
The resistor values within the bridge are determined by the desired
sensitivity.
COMMON
BP/GND
REF LO
REF HI
OSC 1
OSC 2
OSC 3
IN LO
BUFF
TEST
C
C
IN HI
REF
REF
A-Z
INT
G2
G3
V -
C3
A3
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
HI7131, HI7133
TO LOGIC
R
C
TO DISPLAY
V
INT
INT
FIGURE 104.
CC
0.47 F
180k
50pF
12k
3-1843
+
+
+
+
0.1 F
-
-
-
-
TO PIN 1
TO
BACKPLANE 0V
LM339
+5V
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
33k
V+
D1
C1
B1
A1
F1
G1
E1
D2
C2
B2
A2
F2
E2
D3
B3
F3
E3
AB4
POL
V+
COMMON
REF LO
REF HI
OSC 1
OSC 2
OSC 3
IN LO
BUFF
TEST
C
C
IN HI
GND
REF
REF
A-Z
INT
G2
G3
V -
C3
A3
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
V-