Thermal Diodes

OUT

GND

LMT86, LMT86-Q1

SNIS169C – MARCH 2013 – REVISED OCTOBER 2015

www.ti.com

8 Detailed Description

8.1 Overview

The LMT86/LMT86-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).

8.3 Feature Description

8.3.1 LMT86 and LMT86-Q1 Transfer Function

The output voltage of the LMT86 and LMT86-Q1, across the complete operating temperature range is shown in

Table 1. This table is the reference from which the LMT86 and LMT86-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 LMT86 product folder under Tools and Software

Models.

Table 1. LMT86 and LMT86-Q1 Transfer Table

TEMP

TEMP

TEMP

TEMP

TEMP

(°C)

(mV)

(°C)

(mV)

(°C)

(mV)

(°C)

(mV)

(°C)

(mV)

-50

2616

-10

2207

30

1777

70

1335

110

883

-49

2607

-9

2197

31

1766

71

1324

111

872

-48

2598

-8

2186

32

1756

72

1313

112

860

-47

2589

-7

2175

33

1745

73

1301

113

849

-46

2580

-6

2164

34

1734

74

1290

114

837

-45

2571

-5

2154

35

1723

75

1279

115

826

-44

2562

-4

2143

36

1712

76

1268

116

814

-43

2553

-3

2132

37

1701

77

1257

117

803

-42

2543

-2

2122

38

1690

78

1245

118

791

-41

2533

-1

2111

39

1679

79

1234

119

780

-40

2522

0

2100

40

1668

80

1223

120

769

-39

2512

1

2089

41

1657

81

1212

121

757

-38

2501

2

2079

42

1646

82

1201

122

745

-37

2491

3

2068

43

1635

83

1189

123

734

-36

2481

4

2057

44

1624

84

1178

124

722

-35

2470

5

2047

45

1613

85

1167

125

711

-34

2460

6

2036

46

1602

86

1155

126

699

-33

2449

7

2025

47

1591

87

1144

127

688

10

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