Thermal Diodes

OUT

VDD

GND

9

LMT84

www.ti.com

SNIS167E – MARCH 2013 – REVISED OCTOBER 2017

Product Folder Links: LMT84

Submit Documentation Feedback

Copyright © 2013–2017, Texas Instruments Incorporated

8 Detailed Description

8.1 Overview

The LMT84 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 LMT84 Transfer Function

The output voltage of the LMT84, across the complete operating temperature range, is shown in Table 3. This

table is the reference from which the LMT84 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 the LMT84 product folder under Tools and Software Models.

Table 3. LMT84 Transfer Table

TEMP

(°C)

VOUT

(mV)

TEMP

(°C)

VOUT

(mV)

TEMP

(°C)

VOUT

(mV)

TEMP

(°C)

VOUT

(mV)

TEMP

(°C)

VOUT

(mV)

–50

1299

-10

1088

30

871

70

647

110

419

–49

1294

-9

1082

31

865

71

642

111

413

–48

1289

-8

1077

32

860

72

636

112

407

–47

1284

-7

1072

33

854

73

630

113

401

–46

1278

-6

1066

34

849

74

625

114

396

–45

1273

-5

1061

35

843

75

619

115

390

–44

1268

-4

1055

36

838

76

613

116

384

–43

1263

-3

1050

37

832

77

608

117

378

–42

1257

-2

1044

38

827

78

602

118

372

–41

1252

-1

1039

39

821

79

596

119

367

–40

1247

0

1034

40

816

80

591

120

361

–39

1242

1

1028

41

810

81

585

121

355

–38

1236

2

1023

42

804

82

579

122

349