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Using the AT90USBKey
The NTC thermistor used in AT90USBKey has a resistance of 100 K Ω ± 5% at 25°C (T 0 )
and a beta-value of 4250 ±3%. By the use of the following equation, the temperature (T)
can be calculated:
T
ln
β
R T
R 0
β
T 0
Where:
R T = Thermistor value ( Ω ) at T temperature (°Kelvin)
? = 4250 ±3%
R 0 = 100 K Ω ± 5% at 25°C
T 0 = 298 °K (273 °K + 25°K)
The following cross table also can be used. It is based on the above equation.
Table 2-2 . Thermistor Values versus Temperature
Temp.
(°C)
-20
-19
-18
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
R T
(K Ω )
1263,757
1182,881
1107,756
1037,934
973,006
912,596
856,361
803,984
755,175
709,669
667,221
627,604
590,613
556,056
523,757
493,555
465,300
438,854
414,089
390,890
369,145
348,757
329,630
311,680
294,826
Temp.
(°C)
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
R T
(K Ω )
212,958
201,989
191,657
181,920
172,740
164,083
155,914
148,205
140,926
134,051
127,555
121,414
115,608
110,116
104,919
100,000
95,342
90,930
86,750
82,787
79,030
75,466
72,085
68,876
65,830
Temp.
(°C)
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
R T
(K Ω )
50,486
48,350
46,316
44,380
42,537
40,781
39,107
37,513
35,992
34,542
33,159
31,840
30,580
29,378
28,229
27,133
26,085
25,084
24,126
23,211
22,336
21,498
20,697
19,930
19,196
Temp.
(°C)
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
R T
(K Ω )
15,396
14,851
14,329
13,828
13,347
12,885
12,442
12,017
11,608
11,215
10,838
10,476
10,128
9,793
9,471
9,161
8,863
8,576
8,300
8,035
7,779
7,533
7,296
7,067
6,847
AT90USBKey Hardware User Guide
2-11
7627A–AVR–04/06
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