12
Atmel AVR1923
8394B-AVR-02/12
5.7 Analog I/O
5.7.1 Temperature sensor
The temperature sensor circuitry consists of a serial connection of a normal and a
NTC resistor. The NTC sensor is from Murata and some part details are shown in
, more information can be obtained from the manufacturer’s website.
Table 5-7.
NTC characteristics.
Global part number
NCP18WF104J03RB
Resistance (25
℃
)
100k
Ω
±5%
B-Constant (25/50
℃
) (reference value)
4250K ±2%
B-Constant (25/80
℃
) (reference value)
4303K
B-Constant (25/85
℃
) (reference value)
4311K
B-Constant (25/100
℃
) (reference value)
4334K
shows the temperature vs. resistance characteristic. The values are
available from Murata in the datasheet of the NTC.
Table 5-8.
Resistance vs. temperature (from Murata).
Temp.
[°C]
NTC
resistance
[k
Ω
]
Temp.
[°C]
NTC
resistance
[k
Ω
]
Temp.
[°C]
NTC
resistance
[k
Ω
]
Temp.
[°C]
NTC
resistance
[k
Ω
]
-30 2197.225
0 357.012
30 79.222
60 22.224
-29 2055.558
1 338.006
31 75.675
61 21.374
-28 1923.932
2 320.122
32 72.306
62 20.561
-27 1801.573
3 303.287
33 69.104
63 19.782
-26 1687.773
4 287.434
34 66.061
64 19.036
-25 1581.881
5 272.500
35 63.167
65 18.323
-24 1483.100
6 258.426
36 60.415
66 17.640
-23 1391.113
7 245.160
37 57.797
67 16.986
-22 1305.413
8 232.649
38 55.306
68 16.360
-21 1225.531
9 220.847
39 52.934
69 15.760
-20 1151.037
10 209.710
40 50.677
70 15.184
-19 1081.535
11 199.196
41 48.528
71 14.631
-18 1016.661
12 189.268
42 46.482
72 14.101
-17 956.080
13 179.890
43 44.533
73 13.592
-16 899.481
14 171.028
44 42.675
74 13.104
-15 846.579
15 162.651
45 40.904
75 12.635
-14 797.111
16 154.726
46 39.213
76 12.187
-13 750.834
17 147.232
47 37.601
77 11.757
-12 707.524
18 140.142
48 36.063
78 11.344
-11 666.972
19 133.432
49 34.595
79 10.947
-10 628.988
20 127.080
50 33.195
80 10.566
-9 593.342
21 121.066
51 31.859
81 10.200
-8 559.931
22 115.368
52 30.584
82 9.848
