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參數(shù)資料
| 型號： | TMP35GRT |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Low Voltage Temperature Sensors |
| 中文描述： | ANALOG TEMP SENSOR-VOLTAGE, 0.1-2V, 3Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | PLASTIC, MO-178AA, SOT-23, 5 PIN |
| 文件頁數(shù)： | 12/16頁 |
| 文件大小： | 476K |
| 代理商： | TMP35GRT |
REV. C
TMP35/TMP36/TMP37
–12–
The 4 mA offset trim is provided by P2, and P1 provides the
circuit’s full-scale gain trim at 20 mA. These two trims do not
interact because the noninverting input of the OP193 is held at
a virtual ground. The zero-scale and full-scale output currents of
the circuit are adjusted according to the operating temperature
range of each temperature sensor. The Schottky diode, D1, is
required in this circuit to prevent loop supply power-on tran-
sients from pulling the noninverting input of the OP193 more
than 300 mV below its inverting input. Without this diode, such
transients could cause phase reversal of the operational amplifier
and possible latchup of the transmitter. The loop supply voltage
compliance of the circuit is limited by the maximum applied
input voltage to the REF193 and is from 9 V to 18 V.
A Temperature to Frequency Converter
Another common method of transmitting analog information
from a remote location is to convert a voltage to an equivalent in
the frequency domain. This is readily done with any of the
low cost, monolithic voltage-to-frequency converters (VFCs)
available. These VFCs feature a robust, open-collector output
transistor for easy interfacing to digital circuitry. The digital
signal produced by the VFC is less susceptible to contamination
from external noise sources and line voltage drops because the
only important information is the frequency of the digital signal.
As long as the conversions between temperature and frequency
are done accurately, the temperature data from the sensors can
be reliably transmitted.
The circuit in Figure 11 illustrates a method by which the
outputs of these temperature sensors can be converted to a
frequency using the AD654. The output signal of the AD654 is
a square wave that is proportional to the dc input voltage across
Pins 4 and 3. The transfer equation of the circuit is given by:
f
OUT
=
V
TMP
V
OFFSET
10
×
R
T
×
C
T
(
)
TMP3x
V
S
GND
6
4
2
3
7
8
5
1
AD654
V
OUT
10 F/0.1 F
5V
P2
100k
R
OFF1
470
f
OFFSET
R
OFF2
10
R1
P1
R
T
*
0.1 F
C
T
*
5V
R
PU
5k
f
OUT
NB: ATT
A
(min),
f
OUT
= 0Hz
*
R
T
AND C
T
– SEE TABLE
SENSOR
R
T
(R1 + P1)
11.8k
16.2k
18.2k
C
T
TMP35
TMP36
TMP37
+ 500
+ 500
+ 1k
1.7nF
1.8nF
2.1nF
Figure 11. A Temperature-to-Frequency Converter
An offset trim network (f
OUT
OFFSET
) is included with this
circuit to set f
OUT
at 0 Hz when the temperature sensor’s mini-
mum output voltage is reached. Potentiometer P1 is required to
calibrate the absolute accuracy of the AD654. The table in
Figure 11 illustrates the circuit element values for each of the
three sensors. The nominal offset voltage required for 0 Hz
output from the TMP35 is 50 mV; for the TMP36 and
TMP37, the offset voltage required is 100 mV. In all cases
for the circuit values shown, the output frequency transfer
characteristic of the circuit was set at 50 Hz/
°
C. At the receiving
end, a frequency-to-voltage converter (FVC) can be used to
convert the frequency back to a dc voltage for further process
-
ing. One such FVC is the AD650.
For complete information on the AD650 and AD654, please
consult the individual data sheets for those devices.
V
OUT
4
7
1 F
R5
100k
V
OUT
R
L
250
V
9V TO 18V
2
3
D1: HP5082–2810
REF193
TMP3x
R7
100
A1: OP193
*
SEE TEXT
FOR VALUES
R3
*
R1
*
V
S
R2
*
*
P2
D1
R4
*
R6
100k
*
2P1
GND
Q1
2N1711
0.1 F
2
4
6
3V
I
L
Figure 10. A Temperature to 4-to-20 mA Loop Transmitter
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TMP35GRT-REEL7 | 功能描述:IC SENSOR TEMP 2.7/5.5V SOT23-5 RoHS:否 類別:傳感器，轉(zhuǎn)換器 >> 溫度 系列:- 其它有關(guān)文件:DS1820 Digital Thermometer 標(biāo)準(zhǔn)包裝:500 系列:- 感應(yīng)溫度:-55°C ~ 125°C 輸出類型:開路漏極 電源電壓:3 V ~ 5.5 V 精確度:±0.5°C 封裝/外殼:TO-226-3、TO-92-3 標(biāo)準(zhǔn)主體 供應(yīng)商設(shè)備封裝:TO-92 包裝:散裝 |
| TMP35GRTZ-REEL7 | 功能描述:IC TEMP SENSOR CENTIGRD SOT23-5 RoHS:是 類別:傳感器，轉(zhuǎn)換器 >> 溫度 系列:- 其它有關(guān)文件:DS1820 Digital Thermometer 標(biāo)準(zhǔn)包裝:500 系列:- 感應(yīng)溫度:-55°C ~ 125°C 輸出類型:開路漏極 電源電壓:3 V ~ 5.5 V 精確度:±0.5°C 封裝/外殼:TO-226-3、TO-92-3 標(biāo)準(zhǔn)主體 供應(yīng)商設(shè)備封裝:TO-92 包裝:散裝 |
| TMP35GS | 制造商:Rochester Electronics LLC 功能描述:3V TEMPERATURE SENSOR - Bulk 制造商:Analog Devices 功能描述:IC TEMP SENSOR |
| TMP35GS-REEL | 制造商:Analog Devices 功能描述:Temp Sensor Analog(Voltage) Serial (2-Wire) 8-Pin SOIC N T/R |
| TMP35GSZ | 制造商:Analog Devices 功能描述:Temp Sensor Analog(Voltage) Serial (2-Wire) 8-Pin SOIC N |
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