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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(yè)數(shù)： | 7/16頁(yè) |
| 文件大?。?/td> | 377K |
| 代理商： | TMP01EP |
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TMP01
REV. C
–7–
Understanding E rror Sources
T he accuracy of the VPT AT sensor output is well characterized
and specified, however preserving this accuracy in a heating or
cooling control system requires some attention to minimizing
the various potential error sources. T he internal sources of
setpoint programming error include the initial tolerances and
temperature drifts of the reference voltage VREF, the setpoint
comparator input offset voltage and bias current, and the hys-
teresis current scale factor. When evaluating setpoint program-
ming errors, remember that any VREF error contribution at the
comparator inputs is reduced by the resistor divider ratios. T he
comparator input bias current (inputs SET HIGH, SET LOW)
drops to less than 1 nA (typ) when the comparator is tripped.
T his can account for some setpoint voltage error, equal to the
change in bias current times the effective setpoint divider ladder
resistance to ground.
T he thermal mass of the T MP01 package and the degree of
thermal coupling to the surrounding circuitry are the largest
factors in determining the rate of thermal settling, which ulti-
mately determines the rate at which the desired temperature
measurement accuracy may be reached. T hus, one must allow
sufficient time for the device to reach the final temperature.
T he typical thermal time constant for the plastic package is
approximately 140 seconds in still air! T herefore, to reach the
final temperature accuracy within 1%, for a temperature change
of 60 degrees, a settling time of 5 time constants, or 12 min-
utes, is necessary.
T he setpoint comparator input offset voltage and zero hyster-
esis current affect setpoint error. While the 7
μ
A zero hysteresis
current allows the user to program the T MP01 with moderate
resistor divider values, it does vary somewhat from device to de-
vice, causing slight variations in the actual hysteresis obtained
in practice. Comparator input offset directly impacts the pro-
grammed setpoint voltage and thus the resulting hysteresis
band, and must be included in error calculations.
External error sources to consider are the accuracy of the pro-
gramming resistors, grounding error voltages, and the overall
problem of thermal gradients. T he accuracy of the external
programming resistors directly impacts the resulting setpoint
accuracy. T hus in fixed-temperature applications the user
should select resistor tolerances appropriate to the desired
programming accuracy. Resistor temperature drift must be
taken into account also. T his effect can be minimized by select-
ing good quality components, and by keeping all components in
close thermal proximity. Applications requiring high measure-
ment accuracy require great attention to detail regarding
thermal gradients. Careful circuit board layout, component
placement, and protection from stray air currents are necessary
to minimize common thermal error sources.
Also, the user should take care to keep the bottom of the
setpoint programming divider ladder as close to GND (Pin 4)
as possible to minimize errors due to IR voltage drops and cou-
pling of external noise sources. In any case, a 0.1
μ
F capacitor
for power supply bypassing is always recommended at the chip.
Safety Considerations In Heating And Cooling System Design
Designers should anticipate potential system fault conditions
which may result in significant safety hazards which are outside
the control of and cannot be corrected by the T MP01-based
circuit. Governmental and industrial regulations regarding
safety requirements and standards for such designs should be
observed where applicable.
20
5
0
15
10
SUPPLY VOLTAGE – Volts
S
μ
A
550
350
400
375
450
425
475
500
525
+25
°
C
+125
°
C
+85
°
C
–55
°
C
–40
°
C
5.0
3.0
4.5
3.5
4.0
–75
125
–50
100
75
50
25
0
–25
TEMPERATURE –
°
C
M
Figure 6. Minimum Supply Voltage vs. Temperature
Figure 5. Supply Current vs. Supply Voltage
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| TMP01ES | Low Power, Programmable Temperature Controller |
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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(kāi)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(kāi)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(kāi)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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