ICL7106, ICL7107, ICL7107S
Typical Applications
OSC 1 40
OSC 2 39
OSC 3 38
TEST 37
REF HI 36
REF LO 35
C
REF
34
C
REF
33
COMMON 32
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
V - 26
G2 25
C3 24
A3 23
G3 22
GND 21
TO DISPLAY
0.22µF
47kΩ
0.47µF
0.1µF
100pF
100kΩ
(Continued)
TO PIN 1
V+
TO PIN 1
OSC 1 40
OSC 2 39
OSC 3 38
TEST 37
REF HI 36
REF LO 35
C
REF
34
C
REF
33
COMMON 32
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
V - 26
G2 25
C3 24
A3 23
G3 22
BP 21
TO BACKPLANE
TO DISPLAY
0.22µF
0.01µF
0.47µF
47kΩ
9V
ZERO
ADJUST
SILICON NPN
MPS 3704 OR
SIMILAR
0.1µF
100kΩ 1MΩ
100kΩ 220kΩ
100pF
SCALE
FACTOR
ADJUST
22kΩ
100kΩ
The resistor values within the bridge are determined by the desired
sensitivity.
FIGURE 17. ICL7107 MEASUREING RATIOMETRIC VALUES
OF QUAD LOAD CELL
V+
1 V+
2 D1
TO LOGIC
V
CC
3 C1
4 B1
5 A1
6 F1
7 G1
8 E1
9 D2
10 C2
11 B2
12 A2
13 F2
14 E2
15 D3
16 B3
17 F3
O/RANGE
18 E3
19 AB4
20 POL
U/RANGE
CD4023 OR
74C10
OSC 1 40
OSC 2 39
OSC 3 38
TEST 37
REF HI 36
REF LO 35
TO
C
REF
34 LOGIC
GND
C
REF
33
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
V- 26
G2 25
C3 24
A3 23
G3 22
BP 21
V-
A silicon diode-connected transistor has a temperature coefficient of
about -2mV/
o
C. Calibration is achieved by placing the sensing
transistor in ice water and adjusting the zeroing potentiometer for a
000.0 reading. The sensor should then be placed in boiling water
and the scale-factor potentiometer adjusted for a 100.0 reading.
FIGURE 18. ICL7106 USED AS A DIGITAL CENTIGRADE
THERMOMETER
+5V
1 V+
2 D1
3 C1
4 B1
5 A1
6 F1
TO LOGIC
V
CC
12kΩ
7 G1
8 E1
9 D2
10 C2
11 B2
12 A2
13 F2
14 E2
15 D3
16 B3
+
OSC 1 40
OSC 2 39
OSC 3 38
TEST 37
REF HI 36
REF LO 35
C
REF
34
C
REF
33
COMMON 32
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
V- 26
G2 25
C3 24
A3 23
G3 22
BP 21
V-
COMMON 32
The LM339 is required to
ensure logic compatibility
with heavy display loading.
LM339
+
-
-
-
-
O/RANGE
17 F3
18 E3
19 AB4
20 POL
+
U/RANGE
CD4023 OR
74C10
+
33kΩ
CD4077
FIGURE 19. CIRCUIT FOR DEVELOPING UNDERRANGE AND
OVERRANGE SIGNAL FROM ICL7106 OUTPUTS
FIGURE 20. CIRCUIT FOR DEVELOPING UNDERRANGE AND
OVERRANGE SIGNALS FROM ICL7107 OUTPUT
13
FN3082.7
INTERSIL [ INTERSIL CORPORATION ]
