ICL7106 Datasheet, PDF (13/16 Pages) Intersil Corporation – 3 1/2 Digit, LCD/LED Display, A/D Converters

ICL7106, ICL7107, ICL7107S
Typical Applications (Continued)
TO PIN 1
V+
OSC 1 40
100kΩ
OSC 2 39
OSC 3 38
TEST 37
100pF
REF HI 36
REF LO 35
C_REF 34
C_REF 33
COMMON 32
0.1µF
IN HI 31
IN LO 30
A-Z 29
BUFF 28
0.47µF
47kΩ
INT 27
V - 26
0.22µF
G2 25
C3 24
A3 23
TO DISPLAY
G3 22
GND 21
The resistor values within the bridge are determined by the desired
sensitivity.
FIGURE 17. ICL7107 MEASUREING RATIOMETRIC VALUES
OF QUAD LOAD CELL
O/RANGE
U/RANGE
V+
TO LOGIC
V_CC
1 V+
2 D1
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
18 E3
19 AB4
20 POL
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
COMMON 32
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
V- 26 V-
G2 25
C3 24
A3 23
G3 22
BP 21
CD4023 OR
74C10
CD4077
FIGURE 19. CIRCUIT FOR DEVELOPING UNDERRANGE AND
OVERRANGE SIGNAL FROM ICL7106 OUTPUTS
OSC 1 40
OSC 2 39
TO PIN 1
100kΩ
OSC 3 38
TEST 37
REF HI 36
100pF
SCALE
FACTOR
ADJUST
REF LO 35
C_REF
34
0.1µF
C_REF 33
COMMON 32
100kΩ 1MΩ
100kΩ 220kΩ
22kΩ
IN HI 31
IN LO 30
A-Z 29
BUFF 28
INT 27
V - 26
0.01µF
ZERO
ADJUST
0.47µF
47kΩ
SILICON NPN
MPS 3704 OR
SIMILAR
9V
0.22µF
G2 25
C3 24
A3 23
TO DISPLAY
G3 22
BP 21
TO BACKPLANE
A silicon diode-connected transistor has a temperature coefficient of
about -2mV/^oC. 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
TO LOGIC
V_CC
6 F1
7 G1
8 E1
12kΩ
9 D2
The LM339 is required to
ensure logic compatibility
with heavy display loading.
10 C2
11 B2
12 A2
LM339
13 F2
+_-
14 E2
15 D3
O/RANGE
16 B3
+_-
17 F3
18 E3
+_-
19 AB4
U/RANGE
CD4023 OR
74C10
-
20 POL
+
33kΩ
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 V-
G2 25
C3 24
A3 23
G3 22
BP 21
FIGURE 20. CIRCUIT FOR DEVELOPING UNDERRANGE AND
OVERRANGE SIGNALS FROM ICL7107 OUTPUT
13
FN3082.7