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參數(shù)資料
| 型號： | ADT50 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Low Voltage SOT-23 Temperature Sensors(低壓溫度傳感器) |
| 中文描述： | 低壓SOT - 23封裝溫度傳感器（低壓溫度傳感器） |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 168K |
| 代理商： | ADT50 |
ADT45/ADT50
–8–
REV. 0
Average and Differential T emperature Measurement
In many commercial and industrial environments, temperature
sensors are often used to measure the average temperature in a
building, or the difference in temperature between two locations
on a factory floor or in an industrial process. T he circuits in
Figures 20a and 20b demonstrate an inexpensive approach to
average and differential temperature measurement. In Figure
20a, an OP193 is used to amplify the stepped down averaged
output of three temperature sensors to produce an output volt-
age scaled to 10 mV/
°
C, which represents the average tempera-
ture at three locations. T he circuit can be extended to as many
temperature sensors as required as long as the circuit’s transfer
equation is maintained. In this application, it is recommended
that one temperature sensor type be used throughout the circuit;
otherwise, the output voltage of the circuit will not produce an
accurate reading of the various ambient conditions.
R1
300k
V
ADT45/50
ADT45/50
ADT45/50
R2
300k
V
R3
300k
V
R1
3
R5 =
R4
7.5k
V
V
NODE
R5
100k
V
R6
7.5k
V
OP193
2.7V < +V
S
< 12V
0.1
m
F
V
TEMP(AVG)
@ 10mV/
8
C FOR ADT45/50
V
NODE
< 0.1V
V
TEMP(AVG)
= 3
(1)
+ ADT45/50
(2)
+ ADT45/50
(3)
)
1
FOR R1 = R2 = R3;
R4 = R6
Figure 20a. Configuring Multiple Sensors for Average
Temperature Measurements
T he circuit in Figure 20b illustrates how a pair of ADT 50 sensors
can be used with an OP193 configured as a difference amplifier to
read the difference in temperature between two locations. In these
ELEMENT
R3
R4
R5
R6
ADT50
258.6k
V
10k
V
47.7k
V
10k
V
ADT50
ADM660
GND
V
OUT
V
S
10
m
F/0.1
m
F
R1
50k
V
R2
50k
V
+3V
C1
10
m
F
R3
R5
R6
R4
0.1
m
F
–3V
10
m
F
NC
NC
10
m
F
V
OUT
@ 1mV/
8
F
–40
8
F
#
T
A
#
257
8
F
OP193
+
+
+
+
Figure 19c. ADT50 Fahrenheit Thermometer Version 2
applications, it is always possible that one temperature sensor
would be reading a temperature below that of the other sensor.
T o accommodate this condition, the output of the OP193 is
offset to a voltage at one-half the supply via R5 and R6. T hus, the
output voltage of the circuit is measured relative to this point, as
shown in the figure. Using the ADT 50, the output voltage of the
circuit is scaled by 10 mV/
°
C. T o minimize error in the difference
between the two measured temperatures, a common, readily
available thin-film resistor network is used for R1–R4.
OP193
0.1
m
F
1
m
F
2.7V < V
S
< 12V
0.1
m
F
0.1
m
F
ADT50
@ T1
ADT50
@ T2
R1*
R2*
R3*
R8
25k
V
R9
25k
V
R4*
R5
100k
V
R6
100k
V
V
OUT
R7
100k
V
0
8
C
#
T
A
#
125
8
C
V
OUT
= T2–T1 @ 10mV/
8
C
CENTERED ATV
S
2
*R1-R4, CADDOCK T914–100k
V
–100, OR EQUIVALENT
Figure 20b. Configuring Multiple Sensors for Differential
Temperature Measurements
Microprocessor Interrupt Generator
T hese inexpensive temperature sensors can be used with a volt-
age reference and an analog comparator to configure an inter-
rupt generator useful in microprocessor applications. With the
popularity of fast 486 and Pentium
laptop computers, the need
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