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LMT87-Q1 Datasheet(PDF) 10 Page - Texas Instruments

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Part # LMT87-Q1
Description  SC70/TO-92, Analog Temperature Sensors with Class-AB Output
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LMT87-Q1 Datasheet(HTML) 10 Page - Texas Instruments

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(-13.6 mV /
oC) u
V =
T + 2637 mV
(-13.6 mV /
oC) u
V - 2365 mV =
(T - 20
oC)
1958 mV - 2365 mV
50
oC - 20oC
u
¹
·
V - 2365 mV =
(T - 20
oC)
V2 - V1
T2 - T1
u
¹
·
V - V1 =
(T - T1)
30
)
00433
.
0
(
2
mV
V
8
.
2230
00433
.
0
4
582
.
13
582
.
13
T
TEMP
2
u
u
u
ª
º
ª
º
«
»
«
»
¬
¼ ¬
¼
2
TEMP
2
mV
mV
V
mV = 2230.8mV - 13.582
T - 30°C
- 0.00433
T - 30°C
°C
°C
LMT87, LMT87-Q1
SNIS170C – JAN 2014 – REVISED OCTOBER 2015
www.ti.com
Table 1. LMT87/LMT87-Q1 Transfer Table (continued)
TEMP
VOUT
TEMP
VOUT
TEMP
VOUT
TEMP
VOUT
TEMP
VOUT
(°C)
(mV)
(°C)
(mV)
(°C)
(mV)
(°C)
(mV)
(°C)
(mV)
-32
3056
8
2527
48
1985
88
1427
128
858
-31
3043
9
2513
49
1971
89
1413
129
843
-30
3030
10
2500
50
1958
90
1399
130
829
-29
3017
11
2486
51
1944
91
1385
131
814
-28
3004
12
2473
52
1930
92
1371
132
800
-27
2991
13
2459
53
1916
93
1356
133
786
-26
2978
14
2446
54
1902
94
1342
134
771
-25
2965
15
2433
55
1888
95
1328
135
757
-24
2952
16
2419
56
1875
96
1314
136
742
-23
2938
17
2406
57
1861
97
1300
137
728
-22
2925
18
2392
58
1847
98
1286
138
713
-21
2912
19
2379
59
1833
99
1272
139
699
-20
2899
20
2365
60
1819
100
1257
140
684
-19
2886
21
2352
61
1805
101
1243
141
670
-18
2873
22
2338
62
1791
102
1229
142
655
-17
2859
23
2325
63
1777
103
1215
143
640
-16
2846
24
2311
64
1763
104
1201
144
626
-15
2833
25
2298
65
1749
105
1186
145
611
-14
2820
26
2285
66
1735
106
1172
146
597
-13
2807
27
2271
67
1721
107
1158
147
582
-12
2793
28
2258
68
1707
108
1144
148
568
-11
2780
29
2244
69
1693
109
1130
149
553
150
538
Although the LMT87 and LMT87-Q1 is very linear, its response does have a slight umbrella parabolic shape.
This shape is very accurately reflected in Table 1. The Transfer Table can be calculated by using the parabolic
equation.
(1)
The parabolic equation is an approximation of the transfer table and the accuracy of the equation degrades
slightly at the temperature range extremes. Equation 1 can be solved for T resulting in:
(2)
For an even less accurate linear transfer function approximation, a line can easily be calculated over the desired
temperature range from the Table using the two-point equation:
(3)
Where V is in mV, T is in °C, T1 and V1 are the coordinates of the lowest temperature, T2 and V2 are the
coordinates of the highest temperature.
For example, if we want to resolve this equation, over a temperature range of 20°C to 50°C, we would proceed
as follows:
(4)
(5)
(6)
Using this method of linear approximation, the transfer function can be approximated for one or more
temperature ranges of interest.
10
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Product Folder Links: LMT87 LMT87-Q1


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