lm335 sensor de temperatura

5/28/2018 Lm335 Sensor de Temperatura

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TLH5698

LM135LM2

35LM335LM135ALM235ALM335APrecisionTemperatureSensors

February 1995

LM135LM235LM335 LM135ALM235ALM335A

Precision Temperature SensorsGeneral DescriptionThe LM135 series are precision easily-calibrated integrat-ed circuit temperature sensors Operating as a 2-terminalzener the LM135 has a breakdown voltage directly propor-

tional to absolute temperature at a10 mVK With lessthan 1X dynamic impedance the device operates over a

current range of 400mA to 5 mA with virtually no change inperformance When calibrated at 25C the LM135 has typi-cally less than 1C error over a 100C temperature rangeUnlike other sensors the LM135 has a linear output

Applications for the LM135 include almost any type of tem-perature sensing over a b55C to a150C temperaturerange The low impedance and linear output make interfac-ing to readout or control circuitry especially easy

The LM135 operates over a b55C to a150C temperature

range while the LM235 operates over a b40C to a125C

temperature range The LM335 operates from b40C toa100C The LM135LM235LM335 are available pack-aged in hermetic TO-46 transistor packages while the

LM335 is also available in plastic TO-92 packages

FeaturesY Directly calibrated in KelvinY 1C initial accuracy availableY Operates from 400 mA to 5 mAY Less than 1X dynamic impedanceY Easily calibratedY Wide operating temperature rangeY 200C overrangeY

Low cost

Schematic Diagram

TLH56981

Connection Diagrams

TO-92

Plastic Package

TLH56988

Bottom View

Order Number LM335Z or LM335AZ

See NS Package Number Z03A

SO-8

Surface Mount Package

TLH569825

Order Number LM335M orLM335AM

See NS Package Number M08A

TO-46

Metal Can Package

TLH569826

Bottom View

Case is connected to negative pin

Order Number LM135H

LM135H-MIL LM235H LM335H

LM135AH LM235AH or LM335AH

See NS Package Number H03H

C1995 National Semiconductor Corporation RRD-B30M115Printed in U S A


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Absolute Maximum RatingsIf MilitaryAerospace specified devices are required

please contact the National Semiconductor Sales

OfficeDistributors for availability and specifications

(Note 4)

Reverse Current 15 mA

Forward Current 10 mA

Storage TemperatureTO-46 Package b60C to a180CTO-92 Package b60C to a150CSO-8 Package b65C to a150C

Specified Operating Temp Range

Intermittent

C on tinuou s ( No te 2)

LM135 LM135A b55C to a150C 150C to 200C



Lead Temp (Soldering 10 seconds)TO-92 Package 260CTO-46 Package 300CSO-8 Package 300C

Vapor Phase (60 seconds) 215CInfrared (15 seconds) 220C

Temperature Accuracy LM135LM235 LM135ALM235A (Note 1)

Parameter Conditions LM135ALM235A LM135LM235

UnitsMin Typ Max Min Typ Max

Operat ing Output Vo lt age TC e 25C IR e 1 mA 297 298 299 295 298 301 V

Uncalibrated Temperature Error TC e 25C IR e 1 mA 05 1 1 3 C

Uncalibrated Temperature Error TMIN s TC s TMAX IR e 1 mA 13 27 2 5 C

Temperature Error with 25C TMIN s TC s TMAX IR e 1 mA 03 1 05 15 CCalibration

Calibrated Error at Extended TCe

TMAX(Intermittent) 2 2 CTemperatures

Non-Linearity IR e 1 mA 03 05 03 1 C

Temperature Accuracy LM335 LM335A (Note 1)

Parameter Conditions LM335A LM335

UnitsMin Typ Max Min Typ Max

Operat ing Output Vo lt age TC e 25C IR e 1 mA 295 298 301 292 298 304 V

Uncalibrated Temperature Error TC e 25C IR e 1 mA 1 3 2 6 C

Uncalibrated Temperature Error TMIN s TC s TMAX IR e 1 mA 2 5 4 9 C

Temperature Error with 25C TMIN s TC s TMAX IR e 1 mA 05 1 1 2 CCalibration

Calibrated Error at Extended TC e TMAX(Intermittent) 2 2 CTemperatures

Non-Linearity IR e 1 mA 03 15 03 15 C

Electrical Characteristics (Note 1)

LM135LM235 LM335

Parameter Conditions LM135ALM235A LM335A Units

Min Typ Max Min Typ Max

Operating Output Voltage 400 mAsIRs5 mA 25 10 3 14 mVChange with Current At Constant Temperature

Dynamic Impedance IRe1 mA 05 06 X

Output Voltage Temperature a10 a10 mVCCoefficient

Time Constant Still Air 80 80 sec100 ftMin Air 10 10 sec

Stirred Oil 1 1 sec

Time Stability TCe125C 02 02 Ckhr

Note 1 Accuracy measurements are made in a well-stirred oil bath For other conditions self heating must be considered

Note 2Continuous operation at these temperatures for 10000 hours for H package and 5000 hours for Z package may decrease life expectancy of the device

Note 3 Thermal Resistance TO-92 TO-46 SO-8

iJA(junction to ambient) 202CW 400CW 165CWiJC( junction to case) 170CW NA NA

Note 4 Refer to RETS135H for military specifications

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Typical Performance Characteristics

Reverse Voltage Change Calibrated Error Reverse Characteristics

Response Time Dynamic Impedance Noise Voltage

Thermal Resistance

Junction to Air Thermal Time Constant

Thermal Response

in Still Air

Thermal Response in

Stirred Oil Bath Forward Characteristics

TLH56983

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Application HintsCALIBRATING THE LM135

Included on the LM135 chip is an easy method of calibratingthe device for higher accuracies A pot connected across

the LM135 with the arm tied to the adjustment terminal al-lows a 1-point calibration of the sensor that corrects for

inaccuracy over the full temperature range

This single point calibration works because the output of theLM135 is proportional to absolute temperature with the ex-

trapolated output of sensor going to 0V output at 0K(b273 15C) Errors in output voltage versus temperatureare only slope (or scale factor) errors so a slope calibration

at one temperature corrects at all temperatures

The output of the device (calibrated or uncalibrated) can beexpressed as

VOUTTe VOUTTo

c T

To

where T is the unknown temperature and To is a referencetemperature both expressed in degrees Kelvin By calibrat-

ing the output to read correctly at one temperature the out-put at all temperatures is correct Nominally the output iscalibrated at 10 mVK

To insure good sensing accuracy several precautions mustbe taken Like any temperature sensing device self heating

can reduce accuracy The LM135 should be operated at thelowest current suitable for the application Sufficient current

of course must be available to drive both the sensor andthe calibration pot at the maximum operating temperature

as well as any external loadsIf the sensor is used in an ambient where the thermal resist-

ance is constant self heating errors can be calibrated outThis is possible if the device is run with a temperature stable

current Heating will then be proportional to zener voltageand therefore temperature This makes the self heating er-ror proportional to absolute temperature the same as scale

factor errors

WATERPROOFING SENSORS

Meltable inner core heat shrinkable tubing such as manu-

factured by Raychem can be used to make low-cost water-proof sensors The LM335 is inserted into the tubing about

from the end and the tubing heated above the meltingpoint of the core The unfilled end melts and provides aseal over the device

Typical ApplicationsBasic Temperature Sensor

TLH56982

Calibrated Sensor

TLH56989

Calibrate for 2982V at 25C

Wide Operating Supply

TLH569810

Minimum Temperature Sensing

TLH56984

Average Temperature Sensing

TLH569818

Remote Temperature Sensing

TLH569819

Wire length for 1C error due to wire drop

IR e 1 mA IR e 05 mAAWG FEET FEET

14 4000 800016 2500 5000

18 1600 320020 1000 200022 625 125024 400 800

For IR e 05 mA the trim pot must be deleted

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Typical Applications (Continued)

Isolated Temperature Sensor

TLH569820

Simple Temperature Controller

TLH56985

Simple Temperature Control

TLH569821

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Ground Referred Fahrenheit Thermometer

TLH569822

Adjust R2 for 2554V across LM336

Adjust R1 for correct output

Centigrade Thermometer

TLH569823

Adjust for 27315V at output of LM308

Fahrenheit Thermometer

TLH569824

To calibrate adjust R2 for 2554V across LM336

Adjust R1 for correct output

THERMOCOUPLE COLD JUNCTION COMPENSATION

Compensation for Grounded Thermocouple

TLH56986

Select R3 for proper thermocouple type

THERMO- R3 SEEBECK

COUPLE (g1%) COEFFICIENT

J 377X 523 mVC

T 308X 428 mVC

K 293X 408 mVC

S 458X 64 mVCAdjustments Compensates for both sensor and resistor tolerances

1 Short LM329B

2 Adjust R1 for Seebeck Coefficient times ambient temperature (in degrees

K) across R3

3 Short LM335 and adjust R2 for voltage across R3 corresponding to ther-

mocouple type

J 1432 mV K 1117 mV

T 1179 mV S 1768 mV

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Single Power Supply Cold Junction Compensation

TLH569811

Select R3 and R4 for thermocouple type

THERMO- R3 R4 SEEBECKCOUPLE COEFFICIENT

J 105K 385X 523 mVC

T 856X 315X 428 mVC

K 816X 300X 408 mVC

S 128X 463X 64 mVCAdjustments

1 Adjust R1 for the voltage across R3 equal to the Seebeck Coefficient

times ambient temperature in degrees Kelvin

2 Adjust R2 for voltage across R4 corresponding to thermocouple

J 1432 mV

T 1179 mV

K 1117 mV

S 1768 mV

Centigrade Calibrated Thermocouple Thermometer

TLH569812

Terminate thermocouple reference junction in

close proximity to LM335

Adjustments

1 Apply signal in place of thermocouple and ad-

just R3 for a gain of 2457

2 Short non-inverting input of LM308A and out-

put of LM329B to ground

3 Adjust R1 so that VOUT e 2982V 25C

4 Remove short across LM329B and adjust R2

so that VOUT e 246 mV 25C

5 Remove short across thermocouple

Differential Temperature

Sensor

TLH56987

Fast Charger for Nickel-Cadmium Batteries

Adjust D1 to 50 mV greater VZ than D2

Charge terminates on 5C temperature rise Couple D2 to battery

TLH569813

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Differential Temperature Sensor

TLH569814

Variable Offset Thermometer

Adjust for zero with sensor at 0C and 10T pot set at 0C

Adjust for zero output with 10T pot set at 100C and sensor

at 100C

Output reads difference between temperature and dial setting

of 10T pot

TLH569815

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Ground Referred Centigrade Thermometer

TLH569816

Air Flow Detector

TLH569817

Self heating is used to detect air flow

Definition of TermsOperating Output Voltage The voltage appearing across

the positive and negative terminals of the device at speci-fied conditions of operating temperature and current

Uncalibrated Temperature Error The error between theoperating output voltage at 10 mVK and case temperatureat specified conditions of current and case temperature

Calibrated Temperature Error The error between operat-

ing output voltage and case temperature at 10 mVK overa temperature range at a specified operating current withthe 25C error adjusted to zero

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Physical Dimensions inches (millimeters)

Metal Can Package (H)

Order Number LM135H LM235H LM335H LM135AH LM235AH or LM335AH

NS Package Number H03H

8-Lead Molded Small Outline Package (M)

Order Number LM335M or LM335AM

NS Package Number M08A

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LM135LM235LM3

35

LM135ALM235ALM

335APrecisionTemperatureSensors

Physical Dimensions inches (millimeters) (Continued)

Plastic Package

Order Number LM335Z or LM335AZ

NS Package Z03A

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SEMICONDUCTOR CORPORATION As used herein

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systems which (a) are intended for surgical implant support device or system whose failure to perform caninto the body or (b) support or sustain life and whose be reasonably expected to cause the failure of the lifefailure to perform when properly used in accordance support device or system or to affect its safety or

with instructions for use provided in the labeling can effectivenessbe reasonably expected to result in a significant injury

to the user

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lm335 sensor de temperatura

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