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參數(shù)資料
| 型號(hào)： | TMP01EP |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Low Power, Programmable Temperature Controller |
| 中文描述： | ANALOG TEMP SENSOR-VOLTAGE, 2.49-2.5V, RECTANGULAR, THROUGH HOLE MOUNT |
| 封裝： | MINI, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 377K |
| 代理商： | TMP01EP |
TMP01
REV. C
–14–
Figure 21. Isolation Amplifier
Isolation Amplifier
In many industrial applications the sensor is located in an envi-
ronment that needs to be electrically isolated from the central
processing area. Figure 21 shows a simple circuit that uses an
8-pin optoisolator (IL300X C) that can operate across a 5,000 V
barrier. IC1 (an OP290 single-supply amplifier) is used to drive
the LED connected between Pins 1 to 2. T he feedback actually
comes from the photodiode connected from Pins 3 to 4. T he
OP290 drives the LED such that there is enough current gener-
ated in the photodiode to exactly equal the current derived from
the VPT AT voltage across the 470 k
resistor. On the receiving
end, an OP90 converts the current from the second photodiode
to a voltage through its feedback resistor R2. Note that the other
amplifier in the dual OP290 is used to buffer the 2.5 V reference
voltage of the T MP01 for an accurate, low drift LED bias level
without affecting the programmed hysteresis current. A REF43
(a precision 2.5 V reference) provides an accurate bias level at
the receiving end.
T o understand this circuit, it helps to examine the overall equa-
tion for the output voltage. First, the current (I1) in the photo-
diode is set by:
I
1
=
2.5
V
±
VPTAT
470
k
Note that the IL300X C has a gain of 0.73 (typical) with a min
and max of 0.693 and 0.769 respectively. Since this is less than
1.0, R2 must be larger than R1 to achieve overall unity gain. T o
show this the full equation is:
A trim is included for R2 to correct for the initial gain accuracy
of the IL300X C. T o perform this trim, simply adjust for an out-
put voltage equal to VPT AT at any particular temperature. For
VOUT
=
2.5
V
±
I
2
R
2
=
2.5
V
± 0.7
2.5
V
±
VPTAT
470
k
644
k
=
VPTAT
example, at room temperature, VPT AT = 1.49 V, so adjust R2
until V
OUT
= 1.49 V as well. Both the REF43 and the OP90
operate from a single supply, and contribute no significant error
due to drift.
In order to avoid the accuracy trim, and to reduce board space,
complete isolation amplifiers are available, such as the high
accuracy AD202.
Out-of-Range Warning
By connecting the two open collector outputs of the T MP01
together into a “wired-OR” configuration, a temperature “out-
of-range” warning signal is generated. T his can be useful in sen-
sitive equipment calibrated to work over a limited temperature
range. R1, R2, and R3 in Figure 22 are chosen to give a tem-
perature range of 10
°
C around room temperature (25
°
C). T hus,
if the temperature in the equipment falls below +15
°
C or rises
above +35
°
C, the Undertemp Output or Overtemp Output re-
spectively will go low and turn the LED on. T he LED may be
replaced with a simple pull-up resistor to give a logic output for
controlling the instrument, or any of the switching devices dis-
cussed above can be used.
LED
VPTAT
V+
R1
47.5k
R2
4.99k
R3
71.5k
200
TEMPERATURE
SENSOR &
VOLTAGE
REFERENCE
1
2
3
4
HYSTERESIS
GENERATOR
WINDOW
COMPARATOR
TMP01
VPTAT
VREF
7
8
5
6
Figure 22. Out-of-Range Warning
IN4148
I
1
I
2
6
5
3
4
1
2
2.5V
V+
REF43
4
6
2
1.16V TO 1.7V
ISOLATION
BARRIER
OP290
V+
V+
R1
R2
R3
100
TEMPERATURE
SENSOR &
VOLTAGE
REFERENCE
1
2
3
4
HYSTERESIS
GENERATOR
WINDOW
COMPARATOR
TMP01
VPTAT
VREF
7
8
5
6
7
6
4
3
2
OP290
680pF
R1
470k
V+
7
6
4
3
2
OP90
604k
100k
IL300XC
680pF
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TMP01ES | 功能描述:IC SENSOR TEMP/CONTROLLER 8SOIC 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 |
| TMP01ES-REEL | 功能描述:IC SENSOR TEMP/CONTROLLER 8SOIC 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 |
| TMP01ESZ | 功能描述:IC SENSOR TEMP/CONTROLLER 8SOIC 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 |
| TMP01ESZ | 制造商:Analog Devices 功能描述:IC, TEMPERATURE CONTROLLER 1.5C 8-SOIC |
| TMP01ESZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Power Programmable Temperature Controller |
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