tmp03-tmp04數(shù)字輸出型溫度傳感器

1、aSerialDigitalOutputFUNCTIONAL BLOCK Low Cost 3-Pin Package Modulated Serial Digital OutputProportional to 1.5C Accuracy (typ) from 25C to +100C Specified 40C to +100C, Operation to 150C Power Consumption 6.5 mW Max at 5 V Flexible Open-Collector Output on TMP03 CMOS/TTL Compatible Output on TMP04 L

2、ow Voltage Operation (4.5 V to 7 V)Isolated Environmental Control Systems Computer Thermal Monitoring Thermal ProtectionIndustrial Process Control Power System MonitorsPACKAGE TYPES TO-GENERAL The TMP03/TMP04 is a monolithic temperature detector that generates a modulated serial digital output that

3、varies in direct proportion to the temperature of the device. An onboard sensor aSerialDigitalOutputFUNCTIONAL BLOCK Low Cost 3-Pin Package Modulated Serial Digital OutputProportional to 1.5C Accuracy (typ) from 25C to +100C Specified 40C to +100C, Operation to 150C Power Consumption 6.5 mW Max at 5

4、 V Flexible Open-Collector Output on TMP03 CMOS/TTL Compatible Output on TMP04 Low Voltage Operation (4.5 V to 7 V)Isolated Environmental Control Systems Computer Thermal Monitoring Thermal ProtectionIndustrial Process Control Power System MonitorsPACKAGE TYPES TO-GENERAL The TMP03/TMP04 is a monoli

5、thic temperature detector that generates a modulated serial digital output that varies in direct proportion to the temperature of the device. An onboard sensor which is compared to an internal voltage reference and input to a precision digital modulator. The ratiometric encoding format of the serial

6、 digital output is independent of the clock drift errors common to most serial modulation techniques such as voltage- to-frequency converters. Overall accuracy is 1.5C (typical) from 25C to +100C, with excellent transducer linearity. The digitaloutputoftheTMP04isCMOS/TTLcompatible,andis easily inter

7、faced to the serial inputs of most popular micro- processors. The open-collector output of the TMP03 is capable ofsinking5mA. TheTMP03isbestsuitedforsystemsrequiring isolatedcircuitsutilizingoptocouplersorisolationtransformers.The TMP03 and TMP04 are specified for operation at supply voltagesfrom 4.

8、5V to 7V. Operating from +5V, supply current (unloaded) is less than 1.3mA.The TMP03/TMP04 are rated for operation over the 40C +100C temperature range in the low cost TO-92, SO-8, and TSSOP-8 surface mount packages. Operation extends to+150Cwith reduced (continuedonpageBOTTOM(NottoSO-8andRU-8123487

9、65TOP(NottoNC=NO*Patent REV. InformationfurnishedbyAnalogDevicesisbelievedtobeaccurateand reliable.However,noresponsibilityisassumedbyAnalogDevicesforits use,norforanyinfringementsofpatentsorotherrightsofthirdparties which may result from its use. No license is granted by implication or otherwise un

10、der any patent or patent rights of Analog Devices.AnalogDevices,Inc.,OneTechnologyWay,P.O.Box9106,Norwood,MA02062-9106, Tel:617/329-Fax:617/326-321 123 (V+=+5V,40C TA 100Cunlessotherwise1Maximum deviation from output transfer function over specified temperature (V+=+5V,40C TA 100Cunlessotherwise1Max

11、imum deviation from output transfer function over specified temperature 2Guaranteed but not Specifications subject to change without Test10k to+5VSupply,100pFto(V+=+5 V,40C TA +100Cunlessotherwise1Maximum deviation from output transfer function over specified temperature 2Guaranteed but not Specific

12、ations subject to change without Test100pFtoREV. Temperature TemperatureLinearity Long-Term Stability Nominal Mark-Space Ratio NominalT1PulseWidthPowerSupplyRejectionTA = 25CTA40CTA1000Hoursat+125C TA= 0COverRatedSupply TA= +25C%Output High Voltage Output Low Voltage DigitalOutputCapacitance Fall Ti

13、meRiseDevice Turn-On IOL= 800(NoteSeeTestV+POWER SupplyRange VTemperature TemperatureLinearity Long-Term Stability Nominal Mark-Space Ratio NominalT1PulseWidthPowerSupplyRejectionTA= 25CTA40CTA 1000Hoursat+125C TA= 0COverRatedSupply TA= +25C%Output Low Voltage Output Low Output Low DigitalOutputCapa

14、citance Fall TimeDevice Turn-On ISINK= 1.6mA ISINK= 5 mA0CTA+100C ISINK= 4 mA40CTA(NoteSeeTest22VPOWER SupplyRange V(V+=+5V,GND=0V, TA=+25C,unlessotherwiseElectrical tests are performed at wafer probe to the limits shown. Due (V+=+5V,GND=0V, TA=+25C,unlessotherwiseElectrical tests are performed at w

15、afer probe to the limits shown. Due to variations in assembly methods and normal yield loss, yield after packaging is not guaranteed for standard product dice. Consult factory to negotiate specifications based on dice lot qualification through sample lot assembly and testing.1Maximum deviation from

16、ratiometric output transfer function over specified temperature ABSOLUTE MAXIMUM MaximumSupply+9Maximum Output Current (TMP03 50Maximum Output Current (TMP04 10MaximumOpen-CollectorOutputVoltage(TMP03) . +18V OperatingTemperature55CtoDice Junction StorageTemperature65CtoLead Temperature (Soldering,

17、60 1Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation at or above this specification is not implied. Exposure to the above maximum rating conditions for extended periods may affect device relia

18、bility. 2Digital inputs and outputs are protected, however, permanent damage may occur on unprotected units from high-energy electrostatic fields. Keep units in conduc- tive foam or packaging at all times until ready to use. Use proper antistatic handling 3Remove power before inserting or removing u

19、nits from their DICEDie Size 0.050 0.060 inch, 3,000 sq. ( 1.27 1.52 mm, 1.93 sq. For additional DICE ordering information, refer to ORDERING 1JA is specified for device in socket (worst case CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accum

20、ulate on the human body and test equipment and can discharge without detection. Although the TMP03/TMP04 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid

21、performance degradation or loss of functionality.ESD SENSITIVE REV. at+25CTSSOP-Package TO-92 SO-8 (S) Temperature PowerSupplyRejectionTA= OverRatedOutput Low Voltage, TMP04 Output Low Voltage, TMP03 IOH= 800A IOL= 800A ISINK= 1.6mAV+POWER SupplyRange V(continuedfrompageThe TMP03/TMP04 is a powerful

22、, complete temperature measurement system with digital output, on a single chip. The onboard temperature sensor follows in the footsteps of the TMP01lowpowerprogrammabletemperaturecontroller, offering excellent accuracy and linearity over the entire rated temperature range without correction or cali

23、bration by the user.The sensor output is digitized by a first-order sigma-delta modulator,alsoknownasthe“chargebalance”(continuedfrompageThe TMP03/TMP04 is a powerful, complete temperature measurement system with digital output, on a single chip. The onboard temperature sensor follows in the footste

24、ps of the TMP01lowpowerprogrammabletemperaturecontroller, offering excellent accuracy and linearity over the entire rated temperature range without correction or calibration by the user.The sensor output is digitized by a first-order sigma-delta modulator,alsoknownasthe“chargebalance”typeanalog-to-

25、digital converter. (See Figure 1.) This type of converter utilizes time-domainoversamplingandahighaccuracycomparatorto deliver 12 bits of effective accuracy in an extremely compact neatly avoids major error sources common to other modulation techniques, as it is clock-independent.Output Accurate sam

26、pling of an analog signal requires precise spacing of the sampling interval in order to maintain an accurate representation of the signal in the time domain. This dictates a master clock between the digitizer and the signal processor. In thecaseofcompact,cost-effectivedataacquisitionsystems,the addi

27、tion of a buffered, high speed clock line can represent a significant burden on the overall system design. Alternatively, the addition of an onboard clock circuit with the appropriate accuracyanddriftperformancetoanintegratedcircuitcanadd significant cost. The modulation and encoding techniques util

28、ized in the TMP03/TMP04 avoid this problem and allow the overall circuit to fit into a compact, three-pin package. To achieve this, a simple, compact onboard clock and an oversampling digitizer that is insensitive to sampling rate variations are used. Most importantly, the digitized signal is encode

29、d into a ratiometric format in which the exact frequency oftheTMP03/TMP04sclockisirrelevant,andtheeffectsof clock variations are effectively canceled upon decoding by the digital filter.The output of the TMP03/TMP04 is a square wave with a nominal frequency of 35Hz (20%) at +25C. The output format i

30、s readily decoded by the user as follows: VOLTAGE Figure 1. TMP03/TMP04 Block Diagram Showing First-Order Sigma-Delta ModulatorBasically, the sigma-delta modulator consists of an input sampler, a summing network, an integrator, a comparator, and a 1-bit DAC. Similar to the voltage-to-frequency conve

31、rter, this architecture creates in effect a negative feedback loop whose intent is to minimize the integrator output by changing the duty cycle of the comparator output in response to input voltage changes. The comparator samples the output of the integrator at a much higher rate than the input samp

32、ling frequency, called oversampling. This spreads the quantization noise over a much wider band than that of the input signal, improving overall noise performance and increasing accuracy.The modulated output of the comparator is encoded using a circuit technique (patent pending) which results in a s

33、erial digital signal with a mark-space ratio format that is easily decoded by any microprocessor into either degrees centigrade or degrees Fahrenheit values, and readily transmitted or modulated over a single wire. Most importantly, this encoding methodFigure2. TMP03/TMP04Output235400Temperature(C)T

34、720455Temperature (F) TThe time periods T1 (high period) and T2 (low period) are values easily read by a microprocessor timer/counter port, with the above calculations performed in software. Since both periods are obtained consecutively, using the same clock, performingthedivisionindicatedintheabove

35、formulasresults in a ratiometric value that is independent of the exact frequencythe users counting clock.REV. TableI. CounterSizeandClockFrequencyEffectsonQuantizationOptimizing Counter Counter resolution, clock rate, and the resultant temperature decode error that occurs using a counter scheme may

36、 be determined from the following calculations:typically 4.5mW operating at 5V with no load. In the TO-92 packagemountedinfreeTableI. CounterSizeandClockFrequencyEffectsonQuantizationOptimizing Counter Counter resolution, clock rate, and the resultant temperature decode error that occurs using a cou

37、nter scheme may be determined from the following calculations:typically 4.5mW operating at 5V with no load. In the TO-92 packagemountedinfreeair,thisaccountsforatemperature increaseduetoself-heatingofT=PDISSJA=4.5mW 162C/W =0.73C Forafree-standingsurface-mountTSSOPpackage,the temperature increase du

38、e to self-heating would beT=PDISSJA=4.5mW 240C/W =1.08C In addition, power is dissipated by the digital output which is capable of sinking 800 A continuous (TMP04). Under fullT1isnominally10ms,andcomparedtoT2isrelatively insensitive to temperature changes. A useful worst-case assumption is that T1 w

39、ill never exceed 12 ms over the specifiedtemperaturerange.T1max=12Substituting this value for T1 in the formula, temperature (C)=235(T1/T2 400),yieldsamaximumvalueof T2of44msat125C.Rearrangingtheformulaallowsthe maximum value of T2 to be calculated at any maximum operating temperature:T2(Temp)=(T1ma

40、x 400)/(235Temp) inWenowneedtocalculatethemaximumclockfrequencywe canapplytothegatedcountersoitwillnotoverflowduring Frequency (max) = Counter Size/ (T2 at maximum Substituting in the equation using a 12-bit counter gives, Fmax=4096/44ms= 94kHz.Now we can calculate the temperature resolution, or qua

41、ntization error, provided by the counter at the chosen clock frequency and temperature of interest. Again, using a 12-bit counter being clocked at 90 kHz (to allow for 5% temperature over-range), the temperature resolution at+25CiscalculatedQuantizationError(C)=400(Count1/Count2 Count1 1/Count2+ 1)Q

42、uantizationError(F)=720 (Count1/Count2 Count1 1/Count2+ 1)where, Count1 = T1max Frequency, and Count2 T2 (Temp) Frequency. At +25C this gives a resolution of better than 0.3C. Note that the temperature resolution calculated from these equations improves as temperature increases.Highertemperaturereso

43、lutionwillbeobtainedby employing larger counters as shown in Table I. The internal quantization error of the TMP03/TMP04 sets a theoretical minimumresolutionofapproximately0.1Cat+25C.load, the may T 0.6V 0.8T1T2ForexamplewithT2=20msandT1=10ms,thepower dissipation due to the digital output is approxi

44、mately 0.32mW with a 0.8 mA load. In a free-standing TSSOP package this accounts for a temperature increase due to output self-heating T=PDISSJA=0.32mW240C/W=0.08C This temperature increase adds directly to that from the quiescent dissipation and affects the accuracy of the TMP03/ TMP04relativetothe

45、trueambienttemperature.Alternatively, when the same package has been bonded to a large plate or otherthermalmass(effectivelyalargeheatsink)tomeasureits temperature, the total self-heating error would be reduced to TheTMP03andTMP04arelaser-trimmedforaccuracyand linearity during manufacture and, in mo

46、st cases, no further adjustments are required. However, some improvement in performance can be gained by additional system calibration. To perform a single-point calibration at room temperature, measure the TMP03/TMP04 output, record the actual measurement temperature, and modify the offset constant

47、 (normally 235; see theOutputEncodingsection)asfollows:Offset Constant = 235+ (TOBSERVED Amorecomplicatedtwo-pointcalibrationisalsopossible.This involvesmeasuringtheTMP03/TMP04outputattwotemp- eratures,Temp1andTemp2,andmodifyingtheslopeconstant (normally400)asfollows:Slope Constant Temp2Self-Heating

48、 The temperature measurement accuracy of the TMP03/TMP04 may be degraded in some applications due to self-heating.Errors introduced are from the quiescent dissipation, and power dissipated by the digital output. The magnitude of these temperatureerrorsisdependentonthethermalconductivityof the TMP03/

49、TMP04 package, the mounting technique, and effectsofairflow.StaticdissipationintheTMP03/TMP04isT1Temp1 T1Temp2T2Temp2whereT1andT2aretheoutputhighandoutputlowtimes, REV. Error Error 94188 376 TMP03/TMP04Typical Performance 0567SUPPLY VOLTAGE TEMPERATURE Figure OutputFrequencyvs.VS = RLOAD = 5TIMESCAL

50、E=0TEMPERATUREFigure4. T1and T2Timesvs.Figure7. TMP03OutputRiseTimeatTIMESCALE=TIMESCALEFigure 5. TMP03 Output Fall Time at +25Figure8. TMP03OutputRiseTimeatREV. TIMEOUTPUTFREQUENCYVOLTAGESCALE=NORMALIZEDOUTPUTVOLTAGESCALEVOLTAGESCALE=(T) TA =Ch VDD = Wfm s cross Ch 1 s Wfm does cross CLOAD = Ch 1 =

51、1k Novalid 200MS/s (T) TA = +25C VDD = +5VWfmdoesnot cross Ch 1 s Wfm does cross CLOAD = sRLOAD = 1kNovalid Ch1Fall (T) TA =Ch VDD = Wfm s cross Ch 1 s Wfm does cross CLOAD = Ch 1 =1k Novalid TA = RLOAD =V+=RLOAD = TMP03/TMP04Typical Performance 0567SUPPLY VOLTAGE TEMPERATURE Figure OutputFrequencyv

52、s.VS = RLOAD = 5TIMESCALE=0TEMPERATUREFigure4. T1and T2Timesvs.Figure7. TMP03OutputRiseTimeatTIMESCALE=TIMESCALEFigure 5. TMP03 Output Fall Time at +25Figure8. TMP03OutputRiseTimeatREV. TIMEOUTPUTFREQUENCYVOLTAGESCALE=NORMALIZEDOUTPUTVOLTAGESCALEVOLTAGESCALE=(T) TA =Ch VDD = Wfm s cross Ch 1 s Wfm d

53、oes cross CLOAD = Ch 1 =1k Novalid 200MS/s (T) TA = +25C VDD = +5VWfmdoesnot cross Ch 1 s Wfm does cross CLOAD = sRLOAD = 1kNovalid Ch1Fall (T) TA =Ch VDD = Wfm s cross Ch 1 s Wfm does cross CLOAD = Ch 1 =1k Novalid TA = RLOAD =V+=RLOAD = TIMESCALETIMESCALE=Figure12. TMP04OutputRiseTimeatFigure 9. T

54、MP03 Output Fall Time at TIMESCALE=TIMESCALEFigure13. TMP04OutputRiseTimeatFigure 10. TMP04 Output Fall Time at TA=VS =RLOAD =FALLRISETIMESCALE=0500 1000 1500 2000 2500 3000 3500 4000 4500 LOADCAPACITANCEFigure 11. TMP04 Output Fall Time at Figure 14. TMP04 Output Rise & Fall Times vs. Capacitive Lo

55、adREV. VOLTAGESCALE=VOLTAGESCALE=VOLTAGESCALE=TIMEVOLTAGESCALEVOLTAGESCALE200MS/s (T) Ch 1 T =Wfm does VDD = cross Ch 1 s Wfm does cross CLOAD = No RLOAD = Ch 1 200MS/s (T) TA =Ch VDD = Wfm s cross Ch 1 s Wfm does cross CLOAD = Ch 1 =0 Novalid 200MS/s (T) Ch 1 TA =Wfm does VDD = cross Ch 1 s Wfm doe

56、s cross No CLOAD= Rload = Ch 1 200MS/s (T)Edge Ch 1 Wfmdoesnot cross Ch 1 s Wfm does TA =cross VDD = Ch 1 No CLOAD = RLOAD = Ch 1 200MS/s (T) TA =Ch VDD = Wfm s cross Ch 1 s Wfm does cross CLOAD = Ch 1 =0 Novalid TIMESCALETIMESCALE=Figure12. TMP04OutputRiseTimeatFigure 9. TMP03 Output Fall Time at T

57、IMESCALE=TIMESCALEFigure13. TMP04OutputRiseTimeatFigure 10. TMP04 Output Fall Time at TA=VS =RLOAD =FALLRISETIMESCALE=0500 1000 1500 2000 2500 3000 3500 4000 4500 LOADCAPACITANCEFigure 11. TMP04 Output Fall Time at Figure 14. TMP04 Output Rise & Fall Times vs. Capacitive LoadREV. VOLTAGESCALE=VOLTAG

58、ESCALE=VOLTAGESCALE=TIMEVOLTAGESCALEVOLTAGESCALE200MS/s (T) Ch 1 T =Wfm does VDD = cross Ch 1 s Wfm does cross CLOAD = No RLOAD = Ch 1 200MS/s (T) TA =Ch VDD = Wfm s cross Ch 1 s Wfm does cross CLOAD = Ch 1 =0 Novalid 200MS/s (T) Ch 1 TA =Wfm does VDD = cross Ch 1 s Wfm does cross No CLOAD= Rload =

59、Ch 1 200MS/s (T)Edge Ch 1 Wfmdoesnot cross Ch 1 s Wfm does TA =cross VDD = Ch 1 No CLOAD = RLOAD = Ch 1 200MS/s (T) TA =Ch VDD = Wfm s cross Ch 1 s Wfm does cross CLOAD = Ch 1 =0 Novalid 554START-UPVOLTAGEDEFINEDASOUTPUTREADING BEING WITHIN 5C OF OUTPUT AT +4.5V SUPPLYMAXIMUM3V+=2RLOAD = MEASUREMENT

60、S IN 1STIRREDOILRLOAD= 04MINIMUM30TEMPERATURETEMPERATUREFigure15. OutputAccuracyvs.Figure18. Start-UpVoltagevs.TYPICALV+=RLOAD = 0, 0, 000TIME145678SUPPLYVOLTAGEFigure16. Start-UpFigure 19. Supply Current vs. Supply 4V+ = +5V NO LOADV+ = 4.5 - 7V RLOAD=10k3210TEMPERATURETEMPERATUREFigure17. SupplyCu