Datasheet

© 2008 Microchip Technology Inc. DS21455D-page 21
TC7106/A/TC7107/A
FIGURE 10-4: Positive Temperature
Coefficient Resistor Temperature Sensor.
FIGURE 10-5: TC7106A, Using the Internal
Reference: 200 mV Full Scale, 3 Readings-Per-
Second (RPS).
FIGURE 10-6: TC7107 Internal Reference:
200 mV Full Scale, 3RPS, V
IN
- Tied to GND for
Single Ended Inputs.
FIGURE 10-7: Circuit for Developing Under
Range and Over Range Signals from TC7106A
Outputs.
TC7106A
V+ V-
V
IN
-
V
IN
+
V
REF
+
V
REF
-
Common
5.6 k Ω 160 k Ω
R
2
20 k Ω
1N914
9V
R
1
20 k Ω
+
R
3
0.7%/×C
PTC
100 k Ω
100 pF
0.47 µF
47 k
Ω
0.22 µF
To Display
To Backplane
0.1 µF
21
1k Ω 22 k Ω
9V
Set V
REF
= 100 mV
TC7106A
0.01 µF
+
IN
1M
Ω
–
To Pin 1
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
+
–
100 k Ω
100 pF
0.47 µF
47 k
Ω
0.22µF
To Display
0.1 µF
21
1k Ω 22 k Ω
Set V
REF
= 100 mV
0.01 µF
+
IN
1M
Ω
–
To Pin 1
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
-5V
+5V
TC7107A
2120
40
To Logic
V
CC
V-
To Logic
V
CC
V+
CD4077
U/R
O/R
CD4023
OR 74C10
TC7106A
1
O/R = Over Range
U/R = Under Range