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參數資料
| 型號： | LM45B |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | SOT-23 Precision Centigrade Temperature Sensors |
| 中文描述： | 采用SOT - 23精密攝氏溫度傳感器 |
| 文件頁數： | 4/8頁 |
| 文件大小： | 195K |
| 代理商： | LM45B |
Applications
The LM45 can be applied easily in the same way as other
integrated-circuit temperature sensors. It can be glued or
cemented to a surface and its temperature will be within
about 0.2
§
C of the surface temperature.
This presumes that the ambient air temperature is almost
the same as the surface temperature; if the air temperature
were much higher or lower than the surface temperature,
the actual temperature of the LM45 die would be at an inter-
mediate temperature between the surface temperature and
the air temperature.
To ensure good thermal conductivity the backside of the
LM45 die is directly attached to the GND pin. The lands and
traces to the LM45 will, of course, be part of the printed
circuit board, which is the object whose temperature is be-
ing measured. These printed circuit board lands and traces
will not cause the LM45s temperature to deviate from the
desired temperature.
Alternatively, the LM45 can be mounted inside a sealed-end
metal tube, and can then be dipped into a bath or screwed
into a threaded hole in a tank. As with any IC, the LM45 and
accompanying wiring and circuits must be kept insulated
and dry, to avoid leakage and corrosion. This is especially
true if the circuit may operate at cold temperatures where
condensation can occur. Printed-circuit coatings and var-
nishes such as Humiseal and epoxy paints or dips are often
used to insure that moisture cannot corrode the LM45 or its
connections.
Temperature Rise of LM45 Due to Self-Heating
(Thermal Resistance)
SOT-23
**
no heat sink
Still air
450
§
C/W
Moving air
*
Heat sink used is
(/2
×
square printed circuit board with 2 oz. foil with part
attached as shown in Figure 3.
**
Part soldered to 30 gauge wire.
SOT-23
small heat fin
*
260
§
C/W
180
§
C/W
Typical Applications
CAPACITIVE LOADS
Like most micropower circuits, the LM45 has a limited ability
to drive heavy capacitive loads. The LM45 by itself is able to
drive 500 pF without special precautions. If heavier loads
are anticipated, it is easy to isolate or decouple the load with
a resistor; seeFigure 4. Or you can improve the tolerance of
capacitance with a series R-C damper from output to
ground; see Figure 5.
Any linear circuit connected to wires in a hostile environ-
ment can have its performance affected adversely by in-
tense electromagnetic sources such as relays, radio trans-
mitters, motors with arcing brushes, SCR transients, etc, as
its wiring can act as a receiving antenna and its internal
junctions can act as rectifiers. For best results in such cas-
es, a bypass capacitor from V
IN
to ground and a series R-C
damper such as 75
X
in series with 0.2 or 1
m
F from output
to ground, as shown in Figure 5, are often useful.
TL/H/11754–8
FIGURE 4. LM45 with Decoupling from Capacitive Load
TL/H/11754–9
FIGURE 5. LM45 with R-C Damper
TL/H/11754–12
FIGURE 6. Temperature Sensor,
Single Supply,
b
20
§
C to
a
100
§
C
4
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相關代理商/技術參數 |
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| LM45BIM3 | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| LM45BIM3 | 制造商:Texas Instruments 功能描述:PRECISION TEMP SENSOR SMD SOT233 |
| LM45BIM3/NOPB | 功能描述:板上安裝溫度傳感器 PREC CENTIGRADE TEMP SENSOR RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| LM45BIM3X | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| LM45BIM3X/NOPB | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
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