LMT85_15 Datasheet, PDF (9/26 Pages) Texas Instruments – SC70/TO-92, Analog Temperature Sensors with Class-AB Output

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8 Detailed Description
LMT85, LMT85-Q1
SNIS168C – MARCH 2013 – REVISED OCTOBER 2015
8.1 Overview
The LMT85/LMT85-Q1 is an analog output temperature sensor. The temperature sensing element is comprised
of a simple base emitter junction that is forward biased by a current source. The temperature sensing element is
then buffered by an amplifier and provided to the OUT pin. The amplifier has a simple push-pull output stage
thus providing a low impedance output source.
8.2 Functional Block Diagram
Full-Range Celsius Temperature Sensor (−50°C to 150°C).
VDD
Thermal Diodes
OUT
GND
8.3 Feature Description
8.3.1 LMT85/LMT85-Q1 Transfer Function
The output voltage of the LMT85/LMT85-Q1, across the complete operating temperature range, is shown in
Table 1. This table is the reference from which the LMT85/LMT85-Q1 accuracy specifications (listed in the
Accuracy Characteristics section) are determined. This table can be used, for example, in a host processor look-
up table. A file containing this data is available for download at LMT85 product folder under Tools and Software
Models.
TEMP
(°C)
-50
-49
-48
-47
-46
-45
-44
-43
-42
-41
-40
-39
-38
-37
-36
-35
-34
-33
V_OUT
(mV)
1955
1949
1942
1935
1928
1921
1915
1908
1900
1892
1885
1877
1869
1861
1853
1845
1838
1830
TEMP
(°C)
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
7
Table 1. LMT85/LMT85-Q1 Transfer Table
V_OUT
(mV)
1648
1639
1631
1623
1615
1607
1599
1591
1583
1575
1567
1559
1551
1543
1535
1527
1519
1511
TEMP
(°C)
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
V_OUT
(mV)
1324
1316
1308
1299
1291
1283
1275
1267
1258
1250
1242
1234
1225
1217
1209
1201
1192
1184
TEMP
(°C)
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
V_OUT
(mV)
991
983
974
966
957
949
941
932
924
915
907
898
890
881
873
865
856
848
TEMP
(°C)
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
V_OUT
(mV)
651
642
634
625
617
608
599
591
582
573
565
556
547
539
530
521
513
504
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