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LM20BIM7 bảng dữ liệu(PDF) 8 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  DSBGA Temperature Sensor
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LM20BIM7 bảng dữ liệu(HTML) 8 Page - Texas Instruments

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Thermal Diodes
VO
V
+
GND
LM20
SNIS106Q – DECEMBER 1999 – REVISED JANUARY 2015
www.ti.com
7 Detailed Description
7.1 Overview
The LM20 device is a precision analog output CMOS integrated-circuit temperature sensor that operates over a
temperature range of
−55°C to 130°C. The power supply operating range is 2.4 V to 5.5 V. The transfer function
of LM20 is predominately linear, yet has a slight predictable parabolic curvature. The accuracy of the LM20 when
specified to a parabolic transfer function is typically ±1.5°C at an ambient temperature of 30°C. The temperature
error increases linearly and reaches a maximum of ±2.5°C at the temperature range extremes for the LM20. The
temperature range is affected by the power supply voltage. At a power supply voltage of 2.7 V to 5.5 V, the
temperature range extremes are 130°C and
−55°C. Decreasing the power supply voltage to 2.4 V changes the
negative extreme to
−30°C, while the positive remains at 130°C.
The LM20 quiescent current is less than 10
μA. Therefore, self-heating is less than 0.02°C in still air. Shutdown
capability for the LM20 is intrinsic because its inherent low power consumption allows it to be powered directly
from the output of many logic gates or, does not necessitate shutdown at all.
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 class A output stage thus providing a low impedance output that can source 16 µA
and sink 1 µA.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 LM20 Transfer Function
The LM20 transfer function can be described in different ways with varying levels of precision. A simple linear
transfer function with good accuracy near 25°C is:
VO = −11.69 mV/°C × T + 1.8663 V
(1)
Over the full operating temperature range of
−55°C to 130°C, best accuracy can be obtained by using the
parabolic transfer function.
VO = (−3.88×10
−6×T2) + (−1.15×10−2×T) + 1.8639
(2)
Using Equation 2, the following temperature to voltage output characteristic table can be generated.
Table 1. Temperature to Voltage Output Characteristic Table
TEMP
VOUT
TEMP
VOUT
TEMP
VOUT
TEMP
VOUT
TEMP
VOUT
TEMP
VOUT
TEMP
VOUT
(°C)
(V)
(°C)
(V)
(°C)
(V)
(°C)
(V)
(°C)
(V)
(°C)
(V)
(°C)
(V)
-55
2.4847
-28
2.1829
-1
1.8754
26
1.5623
53
1.2435
80
0.9191
107
0.5890
-54
2.4736
-27
2.1716
0
1.8639
27
1.5506
54
1.2316
81
0.9069
108
0.5766
-53
2.4625
-26
2.1603
1
1.8524
28
1.5389
55
1.2197
82
0.8948
109
0.5643
-52
2.4514
-25
2.1490
2
1.8409
29
1.5271
56
1.2077
83
0.8827
110
0.5520
-51
2.4403
-24
2.1377
3
1.8294
30
1.5154
57
1.1958
84
0.8705
111
0.5396
-50
2.4292
-23
2.1263
4
1.8178
31
1.5037
58
1.1838
85
0.8584
112
0.5272
8
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Product Folder Links: LM20


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