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LM20CIM7X 데이터시트(PDF) 11 Page - Texas Instruments

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부품명 LM20CIM7X
상세설명  DSBGA Temperature Sensor
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
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LM20
www.ti.com
SNIS106Q – DECEMBER 1999 – REVISED JANUARY 2015
Figure 4. LM20 With Filter for Noisy Environment and Capacitive Loading Greater Than 300 pF
NOTE
Either placement of resistor, as shown in Figure 3 and Figure 4, is just as effective.
8.1.2 LM20 DSBGA Light Sensitivity
Exposing the LM20 DSBGA package to bright sunlight may cause the output reading of the LM20 to drop by
1.5 V. In a normal office environment of fluorescent lighting the output voltage is minimally affected (less than a
millivolt drop). In either case, TI recommends that the LM20 DSBGA be placed inside an enclosure of some type
that minimizes its light exposure. Most chassis provide more than ample protection. The LM20 does not sustain
permanent damage from light exposure. Removing the light source will cause the output voltage of the LM20 to
recover to the proper value.
8.2 Typical Applications
8.2.1 Full-Range Celsius (Centigrade) Temperature Sensor (
−55°C to 130°C) Operating from a Single Li-
Ion Battery Cell
The LM20 has a very low supply current and a wide supply range; therefore, it can easily be driven by a battery
as shown in Figure 5.
Figure 5. Full-Range Celsius (Centigrade) Temperature Sensor (
−55°C To 130°C) Operating from a Single
Li-Ion Battery Cell
8.2.1.1 Design Requirements
Because the LM20 is a simple temperature sensor that provides an analog output, design requirements related
to layout are more important than electrical requirements. Refer to the Layout section for a detailed description.
8.2.1.2 Detailed Design Procedure
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
(4)
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
(5)
Solving Equation 5 for T:
Copyright © 1999–2015, Texas Instruments Incorporated
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