LM35 LM35A LM35C LM35CA LM35D Precision Centigrade Temperature Sensors

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LM35 LM35A LM35C LM35CA LM35D Precision Centigrade Temperature Sensors

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LM35 LM35A LM35C LM35CA LM35D Precision Centigrade Temperature Sensors
LM35 LM35A LM35C LM35CA LM35D Precision Centigrade Temperature Sensors
LM35 series precision integrated-circuit temperature sensors whose output voltage linearly proportional Celsius (Centigrade) temperature LM35 thus advantage over linear temperature sensors calibrated Kelvin user required subtract large constant voltage from output obtain convenient Centigrade scaling LM35 does require external calibration trimming provide typical accuracies room temperature over full temperature range cost assured trimming calibration wafer level LM35's output impedance linear output precise inherent calibration make interfacing readout control circuitry especially easy used with single power supplies with plus minus supplies draws only from supply very self-heating less than still LM35 rated operate over temperature range while LM35C rated range (b10 with improved accuracy) LM35 series available packaged hermetic TO-46 transistor packages while LM35C LM35CA LM35D also available plastic TO-92 transistor package LM35D also available 8-lead surface mount small outline package plastic TO-202 package
Features
Calibrated directly Celsius (Centigrade) Linear scale factor accuracy guaranteeable Rated full range Suitable remote applications cost wafer-level trimming Operates from volts Less than current drain self-heating still Nonlinearity only typical impedance output load
Connection Diagrams
TO-46 Metal Package TO-92 Plastic Package SO-8 Small Outline Molded Package
5516 5516-1 5516
Case connected negative (GND)
Order Number LM35H LM35AH LM35CH LM35CAH LM35DH Package Number H03H TO-202 Plastic Package
Order Number LM35CZ LM35CAZ LM35DZ Package Number Z03A
View
Connection
Order Number LM35DM Package Number M08A
Typical Applications
5516
FIGURE Basic Centigrade Temperature Sensor
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Choose VOUT
5516-24
Order Number LM35DP Package Number P03A
TRI-STATE registered trademark National Semiconductor Corporation C1995 National Semiconductor Corporation
FIGURE Full-Range Centigrade Temperature Sensor
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RRD-B30M75 Printed
Absolute Maximum Ratings (Note
Military Aerospace specified devices required please contact National Semiconductor Sales Office Distributors availability specifications Supply Voltage
Output Voltage Output Current Storage Temp TO-46 Package TO-92 Package SO-8 Package TO-202 Package Lead Temp TO-46 Package (Soldering seconds) TO-92 Package (Soldering seconds) TO-202 Package (Soldering seconds)
Package (Note Vapor Phase seconds) Infrared seconds) Susceptibility (Note 2500V Specified Operating Temperature Range TMIN TMAX (Note LM35 LM35A LM35C LM35CA LM35D
Electrical Characteristics (Note (Note
LM35A Parameter Conditions Typical
LM35CA Design Limit (Note Typical
Tested Limit (Note
Tested Limit (Note
Design Limit (Note
Units (Max
Accuracy (Note
eb10 TMAX TMIN TMINsTAsTMAX TMINsTAsTMAX TMINsTAsTMAX 4VsVSs30V 4VsVSs30V 4VsVSs30V
Nonlinearity (Note Sensor Gain (Average Slope) Load Regulation (Note 0sILs1 Line Regulation (Note Quiescent Current (Note
Change Quiescent Current (Note Temperature Coefficient Quiescent Current Minimum Temperature Rated Accuracy Long Term Stability
circuit Figure TMAX 1000 hours
Note Unless otherwise noted these specifications apply LM35 LM35A LM35C LM35CA LM35D 5Vdc ILOAD circuit Figure These specifications also apply from TMAX circuit Figure Specifications boldface apply over full rated temperature range Note Thermal resistance TO-46 package junction ambient junction case Thermal resistance TO-92 package junction ambient Thermal resistance small outline molded package junction ambient Thermal resistance TO-202 package junction ambient additional thermal resistance information table Applications section
Electrical Characteristics (Note (Note
Parameter Conditions
(Continued) LM35 LM35C LM35D Design Limit (Note Typical
Typical
Tested Limit (Note
Tested Limit (Note
Design Limit (Note
Units (Max
Accuracy LM35 LM35C (Note Accuracy LM35D (Note Nonlinearity (Note Sensor Gain (Average Slope) Load Regulation (Note 0sILs1 Line Regulation (Note Quiescent Current (Note
eb10 TMAX TMIN TMAX TMIN TMINsTAsTMAX TMINsTAsTMAX TMINsTAsTMAX 4VsVSs30V 4VsVSs30V 4VsVSs30V
Change Quiescent Current (Note Temperature Coefficient Quiescent Current Minimum Temperature Rated Accuracy Long Term Stability
circuit Figure TMAX 1000 hours
Note Regulation measured constant junction temperature using pulse testing with duty cycle Changes output heating effects computed multiplying internal dissipation thermal resistance Note Tested Limits guaranteed 100% tested production Note Design Limits guaranteed (but 100% production tested) over indicated temperature supply voltage ranges These limits used calculate outgoing quality levels Note Specifications boldface apply over full rated temperature range Note Accuracy defined error between output voltage 10mv times device's case temperature specified conditions voltage current temperature (expressed Note Nonlinearity defined deviation curve from best-fit straight line over device's rated temperature range Note Quiescent current defined circuit Figure Note Absolute Maximum Ratings indicate limits beyond which damage device occur electrical specifications apply when operating device beyond rated operating conditions Note Note Human body model discharged through resistor Note AN-450 ``Surface Mounting Methods Their Effect Product Reliability'' section titled ``Surface Mount'' found current National Semiconductor Linear Data Book other methods soldering surface mount devices
Typical Performance Characteristics
Thermal Resistance Junction Thermal Time Constant Thermal Response Still
Thermal Response Stirred Bath
Minimum Supply Voltage Temperature
Quiescent Current Temperature Circuit Figure
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Quiescent Current Temperature Circuit Figure
Accuracy Temperature (Guaranteed)
Accuracy Temperature (Guaranteed)
5516
Noise Voltage
Start-Up Response
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Applications
LM35 applied easily same other integrated-circuit temperature sensors glued cemented surface temperature will within about surface temperature This presumes that ambient temperature almost same surface temperature temperature were much higher lower than surface temperature actual temperature LM35 would intermediate temperature between surface temperature temperature This expecially true TO-92 plastic package where copper leads principal thermal path carry heat into device temperature might closer temperature than surface temperature minimize this problem sure that wiring LM35 leaves device held same temperature surface interest easiest this cover these wires with bead epoxy which will insure that leads wires same temperature surface that LM35 die's temperature will affected temperature
TO-46 TO-46 heat sink small heat
TO-46 metal package also soldered metal surface pipe without damage course that case terminal circuit will grounded that metal Alternatively LM35 mounted inside sealed-end metal tube then dipped into bath screwed into threaded hole tank with LM35 accompanying wiring circuits must kept insulated avoid leakage corrosion This especially true circuit operate cold temperatures where condensation occur Printed-circuit coatings varnishes such Humiseal epoxy paints dips often used insure that moisture cannot corrode LM35 connections These devices sometimes soldered small lightweight heat decrease thermal time constant speed response slowly-moving other hand small thermal mass added sensor give steadiest reading despite small deviations temperature
Temperature Rise LM35 Self-heating (Thermal Resistance)
TO-92 TO-92 heat sink small heat SO-8 SO-8 heat sink small heat TO-202 TO-202 heat sink small heat
Still Moving Still Stirred (Clamped metal Infinite heat sink)
Wakefield type disc sheet brass soldered case similar TO-92 SO-8 packages glued leads soldered square printed circuit board with foil similar
Typical Applications (Continued)
5516
FIGURE LM35 with Decoupling from Capacitive Load
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FIGURE LM35 with Damper CAPACITIVE LOADS Like most micropower circuits LM35 limited ability drive heavy capacitive loads LM35 itself able drive without special precautions heavier loads anticipated easy isolate decouple load with resistor Figure improve tolerance capacitance with series damper from output ground Figure When LM35 applied with 200X load resistor shown Figure relatively immune wiring capacitance because capacitance forms bypass from ground input output However with linear circuit connected wires hostile environment performance affected adversely intense electromagnetic sources such relays radio transmitters motors with arcing brushes transients wiring receiving antenna internal junctions rectifiers best results such cases bypass capacitor from ground series damper such series with from output ground often useful These shown Figures
Typical Applications (Continued)
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FIGURE Two-Wire Remote Temperature Sensor (Output Referred Ground)
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FIGURE Two-Wire Remote Temperature Sensor (Grounded Sensor)
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FIGURE Temperature Sensor Single Supply
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FIGURE Two-Wire Remote Temperature Sensor (Output Referred Ground)
5516-9
FIGURE 4-To-20 Current Source
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FIGURE Fahrenheit Thermometer
Typical Applications (Continued)
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FIGURE Centigrade Thermometer (Analog Meter)
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FIGURE Expanded Scale Thermometer Fahrenheit Example Shown)
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FIGURE Temperature Digital Converter (Serial Output) Full Scale)
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FIGURE Temperature Digital Converter (Parallel TRI-STATE Outputs Standard Data Interface) (128 Full Scale)
Typical Applications (Continued)
5516
film resistor -Trim 075V -Trim 955V -Trim 075V 100mV Tambient -Example 275V
FIGURE Bar-Graph Temperature Display (Dot Mode)
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FIGURE LM35 With Voltage-To-Frequency Converter Isolated Output 1500
Block Diagram
5516
Physical Dimensions inches (millimeters)
TO-46 Metal Package Order Number LM35H LM35AH LM35CH LM35CAH LM35DH Package Number H03H
SO-8 Molded Small Outline Package Order Number LM35DM Package Number M08A
Physical Dimensions inches (millimeters) (Continued)
Power Package TO-202 Order Number LM35DP Package Number P03A
LM35 LM35A LM35C LM35CA LM35D Precision Centigrade Temperature Sensors
Physical Dimensions inches (millimeters) (Continued)
TO-92 Plastic Package Order Number LM35CZ LM35CAZ LM35DZ Package Number Z03A
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT NATIONAL SEMICONDUCTOR CORPORATION used herein Life support devices systems devices systems which intended surgical implant into body support sustain life whose failure perform when properly used accordance with instructions provided labeling reasonably expected result significant injury user
National Semiconductor Corporation 2900 Semiconductor Drive 58090 Santa Clara 95052-8090 1(800) 272-9959 (910) 339-9240 National Semiconductor GmbH Livry-Gargan-Str D-82256 F4urstenfeldbruck Germany (81-41) 35-0 Telex 527649 (81-41) 35-1 National Semiconductor Japan Sumitomo Chemical Engineering Center Bldg 1-7-1 Nakase Mihama-Ku Chiba-City Ciba Prefecture (043) 299-2300 (043) 299-2500
critical component component life support device system whose failure perform reasonably expected cause failure life support device system affect safety effectiveness
National Semiconductor Hong Kong 13th Floor Straight Block Ocean Centre Canton Tsimshatsui Kowloon Hong Kong (852) 2737-1600 (852) 2736-9960
National Semiconductores Brazil Ltda Deputado Lacorda Franco 120-3A Paulo-SP Brazil 05418-000 (55-11) 212-5066 Telex 391-1131931 NSBR (55-11) 212-1181
National Semiconductor (Australia) Building Business Park Drive Monash Business Park Nottinghill Melbourne Victoria 3168 Australia 558-9999 558-9998
National does assume responsibility circuitry described circuit patent licenses implied National reserves right time without notice change said circuitry specifications
LM75 Digital Temperature Sensor Demo Board Hardware Software Guide
LM75 Digital Temperature Sensor Demo Board Hardware Software Guide
1.0.0 System Overview
LM75 Digital Temperature Sensor Demo package includes software hardware evaluation tools LM75 Digital Temperature Sensor. LM75 temperature sensor, Delta-Sigma analog-to-digital converter, digital over-temperature detector with interface. parallel printer port used simulate interface required drive LM75. software provided query LM75 time read temperature display modes, Thermometer Strip Chart. opendrain Overtemperature Shutdown (O.S.) output LM75 becomes active when temperature exceeds programmable limit. This operate either "Comparator" "Interrupt" mode. state this sensed through parallel printer port. software program both temperature alarm threshold (Tos) temperature which alarm condition goes away (THyst). addition, software read back contents LM75's THyst registers. Selection address determined state three pins (A0, LM75. Next Address Menu select address Demo Board. Demo Board's address using jumpers that connect Address Bits A0-A2 ground. grounded Address "0"; jumper installed, "1". When board shipped you, three address jumpers were installed. Therefore selecting Address 1001 under Address Menu configures software communicate with LM75 Demo Board shipped. change Demo Board's address removing jumpers, sure select corresponding address from Address Menu. ready turn board. Click command button labeled "Off" found left hand corner screen. should message indicating that "LM75 registers default power state. systems go!".
3.0.0 Software Description
3.1.0 Menus
3.1.1 File Menu Exit This command exits LM75Demo software. Demo Board powered down. dialog will appear indicate this. board should disconnected from port. After clicking "OK" dialog parallel printer port reinitialized. 3.1.2 Temp Display Menu This menu allows select temperature data retrieved from LM75 will displayed. Thermometer Choosing this option displays thermometer bottom portion "LM75 Digital Temperature Sensor Demo Software" window. reading thermometer updated when Temperature Register LM75 read. This occurs when "Read" "Loop" command buttons "Temperature Register" clicked. arrows point setting THyst Registers LM75. arrow with match represents Register, while blue arrow with snowflake represents THyst Register. Strip Chart Selecting this option will display Strip Chart graph bottom portion "LM75 Digital Temperature Sensor Demo Software" window. chart updated when Temperature Register LM75 read. This occurs when "Read" "Loop" command buttons "Temperature Register" clicked. chart also updated when THyst Registers LM75 read written 3.1.3 Assignment Menu Before powering board necessary port address that board going plugged into.
2.0.0 Installing Hardware Software
LM75 Demo board connected computer through parallel printer port. board derives necessary power through port. External power supplies necessary. board plugged directly back computer connected through DB25 male-tofemale straight-through cable. Before actually connecting LM75 Demo Board should first install software LM75 Demo Software requires Windows 3.1or later. Running SETUP.EXE found supplied floppy diskette will install software your hard drive location designate. Before executing software parallel printer port address that Demo Board will connected needs determined. (Microsoft Diagnostic) utility used determine this address. Start shell MSD. parallel printer port assignment found under Ports. Note address printer port that planning connect Demo Board Start LM75Demo software. Select parallel printer port address under Assignment Menu. your address displayed menu, Custom option assign hexadecimal address between (Hexadecimal). Extreme caution should used when using this option. incorrectly, your system need rebooted.
three most common addresses show below displayed "LPT Assignment" menu: (HEX) (HEX) (HEX) (Microsoft Diagnostic) utility used determine this address. Start shell MSD. parallel printer port assignment found under Ports. Note address printer port that planning connect Demo Board Selecting address trial error basis option LM75 will only device attached port computer. Custom parallel printer port address ones displayed menu then this option used address hexadecimal value greater than less than FFF. Extreme caution should used when using this option because incorrectly necessary reboot computer. recommended that this address arbitrarily because many strange things happen, such rebooting maybe writing drive. Please this option with extreme care! 3.1.4 Address Menu address selected this menu should match address Demo Board. According specifications, LM75 7-bit slave address. four most significant bits slave address hard wired inside LM75 "1001". three least significant bits address assigned pins A2-A0, connecting these pins ground low, (0); high, (1). Jumpers A0A2 found LM75 Demo Board select state three least significant bits address. When jumper installed that zero. When jumper removed that one. 3.1.5 Help Menu Contents Selecting this option will display this file using WinHelp. About Selecting this option will display initial opening screen.
shutdown, reduce system clock speed. Interrupt mode exceeding also makes O.S. active O.S. will remain active indefinitely until reset reading register interface. Once O.S. been activated crossing Tos, then reset, activated again only Temperature going below THyst. Again, will remain active indefinitely until being reset read. Placing LM75 shutdown mode also resets O.S. Output. 3.2.1 LM75 Description: Label Function Serial BiDirectional Data line Clock Input Overtemperature Shutdown Open Collector Output Power Supply Ground Positive Supply Voltage Input User-Set Address Inputs Typical Connection From controller From controller Pull Resistor, Controller interrupt line Ground voltage from volts Ground (Low, "0") (High, "1")
O.S.
A0-A2
7,6,5
3.2.2 LM75 Default Setting LM75 always powers known state. LM75 power default conditions are: Comparator mode THyst O.S. active Pointer "00"; Temperature Register With these operating conditions, LM75 standalone thermostat with above temperature settings. Connection required.
3.2.0 LM75 Operation
LM75 temperature sensor incorporates band-gap type temperature sensor 9-bit Delta-Sigma (Analog-toDigital Converter). temperature data output LM75 available times bus. function this interface fully explained LM75 data sheet (See Sections Interface Internal Register Structure). temperature data read while conversion progress, conversion will stopped restarted after read. digital comparator also incorporated that compares series readings, number which user-selectable, user-programmable point hysteresis values. comparator trips O.S. output line, which programmable mode polarity. Comparator mode O.S. output behaves like thermostat. output becomes active when temperature exceeds limit, leaves active state when temperature drops below THyst limit. this mode O.S. output used turn cooling initiate emergency system
3.3.0 LM75 Registers
3.3.1 Temperature Data Format Temperature data read from Temperature, Point, THyst Point registers, written Point, THyst Point registers. Temperature data represented 9-bit, two's complement word with (Least Significant Bit) equal
Temperature
Digital Output Binary 0FAh 032h 001h
+125°C +25°C +0.5°C
1111 1010 0011 0010 0000 0001
5/30/96
-0.5°C -25°C -55°C
0000 0000 1111 1111 1100 1110 1001 0010
000h 1FFh 1CEh 192h
perature register field display actual binary data transmitted LM75. temperature data format 9-bit two's complement first. Loop Command Button This command button first disables other command buttons. command will continuously send Temperature register read commands LM75. interval between each read 1-second increments dialog that appears when Loop command button clicked. accuracy intervals will depend speed computer used. This dialog also allows setting total number readings that displayed when Strip Chart option selected whether looping should continue after this total reached. Switching between Thermometer display Strip Chart display while looping possible. 3.3.5 Configuration Register configuration register 8-bit register that following format:
O.S. Polarity Cmp/Int Shutdown
Tos, THyst Temperature registers bits long. data format show below:
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1
Note that LSBs (D0-D6) always zero. 3.3.2 Register Read Command Button This command sends "read register" command LM75. output from LM75 then displayed text left command button. text boxes left side register field display actual binary data transmitted LM75. temperature data format 9-bit two's complement first. Write Command Button This command sends "write register" command LM75. data transmitted LM75 displayed text left command button. text boxes left side register field display actual binary data transmitted LM75. temperature data format 9-bit two's complement first. data text modified greater than equal less than equal -125 degree increments. other increment software will round value nearest half degree. 3.3.3 THyst Register Read Command Button This command sends "read THyst register" command LM75. output from LM75 then displayed text left command button. text boxes left side THyst register field display actual binary data transmitted LM75. temperature data format 9-bit two's complement first. Write Command Button This command sends "write THyst register" command LM75. data transmitted LM75 displayed text left command button. text boxes left side THyst register field display actual binary data transmitted LM75. temperature data format two's complement first. data text modified greater than equal less than equal +125°C degree increments. other increment software will round value nearest half degree. 3.3.4 Temperature Register LM75 Temperature Register read only register. This register updated when temperature conversion completed. temperature conversion stopped when read command sent restarted after data been read host. Read Command Button This command sends "read Temperature" register command LM75. output from LM75 then displayed text left command button. text boxes left side Tem-
Fault Queue
Pressing "Update" command configuration register field enables dialog which allows setting individual bits this register. individual bits modified modifying text boxes clicking radio buttons, etc. Clicking "Write" command button this dialog sends displayed data LM75 configuration register. Clicking "Read" command button reads LM75's configuration register displays data. Clicking "OK" button disables dialog box. Note that when configuration register dialog enabled data displayed will necessarily reflect what LM75's configuration register. data displayed dialog valid only after clicking "Read" command button.
3.4.0 Output Function
output LM75 drives high intensity LED. anode printer port dedicated power. output then another parallel printer port that software sense when alarm condition occurred. output functions modes: Interrupt Comparator. Interrupt mode output cleared when register LM75 read. Comparator mode requires that temperature that LM75 sensing drops below setting Hysteresis register before output cleared. This output active high active low. function this output defined configuration register setting.
3.5.0 Pointer Command
four data registers (Tos, THyst, Temperature Configuration) selected pointer register. This register 8-bit register. LSBs used select four data registers. Please refer LM75 data sheet Section Internal Register Structure detailed description this register.
5/30/96
4.0.0 Hardware Description
Figure shows Demo Board schematic diagram. DB25 connector that plugs into parallel printer port connector your computer. Description pinout shown following table: DB25 Number
Connection Supplies LM75 Supplies Supplies Connection Drives input LM75. Provides clocking interface. Provides data input Connection Input software state output Connection
14-17 18-25
Input software state. Connection Ground Connection
header that directly mapped LM75 pinout. JP2, used control state Address Bits When shorting installed header input logic low.
Function
Figure LM75 Demo Board Schematic
5/30/96
4.1.0 Board Layout
3/16
Figure Component Side Demo Board
3/16
Figure Solder Side Demo Board
Figure Silk Screen Demo Board
Figure LM75 Demo Board printed circuit board layout.
5/30/96
4.2.0 LM75 Demo Board Bill Materials
Item Quantity Reference Part 0.1µF (0805 case SMT) 1N34A 1N270 HLMP-K150 HEADER (1x2 Header with Short) (1x2 Header with Short) (1x2 Header with Short) CONNECTOR DB25 MALE/RightAngle Board Mount 100k (0805 case SMT) 3.9k (0805 case SMT) (0805 case SMT) LM75
6.0.0 Typical Problems Encounter
Moisture conductive fluid board components will cause board operate improperly. Even condensation from your breath cause havoc. loop time between temperature readings longer than programmed. computer being used cannot process program steps quickly enough. faster computer. This occurs only when loop interval seconds.
7.0.0 Call when need HELP
Please call Customer Response Center Arlington, Texas. phone numbers are: 1(800)272-9959 (voice) 1(800)432- 9672 (fax). also leave message site. http://www.national.com. Also available site data sheets other temperature sensor products.
R1,R2,R3 R6,R5
5.0.0 Using Multiple LM75 Demo Boards
addressing capability LM75 allows devices share same serial lines. However capabilities your output port able drive that many devices parallel. Connector board allows connect several LM75 Demo Boards parallel long their address settings match. only lines that should connected GND, SCA. only drawback that outputs boards that connected directly parallel printer port will function correctly. LEDs will light software will sense when alarm occurred. board that plugged directly parallel printer port will completely functional. Selection between boards simple matter just changing address software. register data device being addressed displayed until read buttons clicked.
5/30/96
LM3911 Temperature Controller
June 1994
LM3911 Temperature Controller
LM3911 highly accurate temperature measurement control system over temperature range Fabricated single monolithic chip includes temperature sensor stable voltage reference operational amplifier output voltage LM3911 directly proportional temperature degrees Kelvin Using internal with external resistors temperature scale factor easily obtained connecting comparator output will switch temperature transverses set-point making device useful on-off temperature controller active shunt regulator connected across power leads LM3911 provide stable voltage reference sensing system This allows power supply voltage with suitable external resistors input bias current relatively constant with temperature ensuring high accuracy when high source impedance used Further output collector returned voltage higher than allowing LM3911 drive lamps relays supply LM3911 uses difference emitter-base voltage transistors operating different current densities basic temperature sensitive element Since this output depends only transistor matching same reliability stability present amps expected LM3911 available package styles metal TO-46 8-lead epoxy mini-DIP epoxy package electrical connections made side device allowing other leads used attaching LM3911 temperature souce LM3911 rated operation over temperature range
Features
Uncalibrated accuracy Internal with frequency compensation Linear output calibrated degrees Kelvin Celsius Fahrenheit Output drive loads Internal stable voltage reference cost
Block Diagram
Typical Applications
Ground Referred Centigrade Thermometer Basic Temperature Controller
Proportioning Temperature Controller
Output goes negative temperature increase Trims initial zener tolerance output read Note determines proportioning frequency Note
5701
0015A Note Either ground
C1995 National Semiconductor Corporation 5701 RRD-B30M115 Printed
Absolute Maximum Ratings
Military Aerospace specified devices required please contact National Semiconductor Sales Office Distributors availability specifications Supply Current (Externally Set) Output Collector Voltage Feedback Input Voltage Range Output Short Circuit Duration Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering seconds) Indefinite
Electrical Characteristics (Note
Parameter SENSOR Output Voltage Output Voltage Output Voltage Linearity Long-Term Stability Repeatability VOLTAGE REFERENCE Reverse Breakdown Voltage Reverse Breakdown Voltage Change With Current Temperature Stability Dynamic Impedance Noise Voltage Long Term Stability Input Bias Current Input Bias Current Voltage Gain Output Leakage Current Output Leakage Current Output Source Current Output Sink Current (Note (Note VOUTs3 1VsVOUTs36V 2500 15000 Hzsfs10 mAsIzs5 mAsIzs5 eb25 (Note (Note (Note Conditions Units
Note These specifications apply ISUPPLY unless otherwise specified Note output voltage applies basic thermometer configuration with output input terminals shorted load resistance This feedback sense voltage includes errors both sensor This voltage specified sensor rapidly stirred bath output referred Note output leakage current specified with overdrive Since this voltage changes with temperature voltage drive turn-off changes defined VOUT (with output input shorted) This specification applies VOUT
Application Hints
Although LM3911 designed totally trouble-free certain precautions should taken insure best possible performance with temperature sensor internal power dissipation will raise sensor's temperature above ambient Nominal suggested operating current shunt regulator causes power dissipation free still this raises package temperature about Although regulator will operate higher reverse currents output will drive loads these higher currents will raise sensor temperature about above ambient-degrading accuracy Therefore sensor should operated lowest possible power level With moving liquid surface temperature sensing selfheating great problem since measured media will conduct heat from sensor Also there many small heat sinks designed transistors which will improve heat transfer sensor from surrounding medium small finned clip-on heat sink quite effective free-air should mentioned that LM3911 base package therefore coupling base preferable internal reference regulator provides temperature stable voltage offsetting output setting comparison point temperature controllers However since this reference same temperature sensor temperature changes will also cause reference drift application where maximum accuracy needed external reference should used course fixed temperature controllers internal reference adequate
Typical Performance Characteristics
Temperature Conversion TCENTIGRADE TFAHRENHEIT TKELVIN Input Current Power Supply Current
Output Saturation Voltage
Thermal Time Constant Stirred Bath
Thermal Time Constant Still
Supply Sensitivity
Device Temperature Rise
Device Temperature Rise
Reference Regulation
Turn ``ON'' Response
Amplifier Output Impedance
5701
Schematic Diagram
Typical Applications (Continued) Basic Thermometer Negative Supply
Basic Thermometer Positive Supply
Increasing Output Drive
Note Load current supplied through
103X
103X
103X
External Frequency Compensation Greater Stability when Driving Capacitive Loads
Operating With External Zener Lower Power Dissipation
Temperature Controller With Hysteresis
Output goes positive temperature increase Depends Zener current temperature
5701
Typical Applications (Continued)
Thermometer With Meter Output
(VZ) 01DT Select
Meter Thermometer With Trimmed Output
IQR1
Shunt regulator voltage (use Meter temperature span Meter full scale current Meter zero temperature Current through zero meter current
Values shown above following equations units result basic sensitivity transducer Selected meter thermometer except should more than desired Calibrates
Ground Referred Thermometer
(VZ)(10mV)(DT)
Ground Referred Centigrade Thermometer
Shunt regulator voltage Temperature span Temperature zero output Full scale output voltage Current through zero output voltage (typically zero
Terminal Temperature Current Transducer
R3(X)
TH(VZ TL(VZ
(R2)(0
TL)(R2)
Temperature Temperature Zener voltage temperature output current High temperature output current
Values shown IOUT temperature
5701
above following equations units result basic sensitivity transducer
Typical Applications (Continued)
Over Temperature Detectors With Common Output
Trip Point
5701
Two-Wire Remote Electronic Thermostat (Gas Furnace Control)
5701
Solenoid heater will provide about setting range trim resistor (100k) selected bring near middle rotation heating proper positioning preheat sensor giving control anticipation presently used many home thermostats
Electronic Thermostat
SENSITIVE GATE TRIAC T2300 40529 SIMILAR
temperature turns power cooler when temperature inTL 5701 creases
Typical Applications (Continued)
Three-Wire Electronic Thermostat
Divider nominal range Wire wound resistors will provide maximum temperature stability Almost TRIAC rated amperes usable with appropriate load
Differential Thermometer Kelvin Thermometer With Ground Referred Output
103X
VOUT
Output swing
with output impedance above equation units result basic sensitivity transducer
Connection Diagrams
Dual-In-Line Package TO-46 Package
5701
5701
Order Number LM3911N Package N08E
Order Number LM3911H-46 Package H04A
LM3911 Temperature Controller
Physical Dimensions inches (millimeters)
Molded Dual-In-Line Package Order Number LM3911N Package N08E
TO-46 Package Order Number LM3911H-46 Package H04A LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT NATIONAL SEMICONDUCTOR CORPORATION used herein Life support devices systems devices systems which intended surgical implant into body support sustain life whose failure perform when properly used accordance with instructions provided labeling reasonably expected result significant injury user
National Semiconductor Corporation 1111 West Bardin Road Arlington 76017 1(800) 272-9959 1(800) 737-7018
critical component component life support device system whose failure perform reasonably expected cause failure life support device system affect safety effectiveness
National Semiconductor Europe (a49) 0-180-530 Email cnjwge tevm2 Deutsch (a49) 0-180-530 English (a49) 0-180-532 Fran (a49) 0-180-532 Italiano (a49) 0-180-534
National Semiconductor Hong Kong 13th Floor Straight Block Ocean Centre Canton Tsimshatsui Kowloon Hong Kong (852) 2737-1600 (852) 2736-9960
National Semiconductor Japan 81-043-299-2309 81-043-299-2408
National does assume responsibility circuitry described circuit patent licenses implied National reserves right time without notice change said circuitry specifications

LM35 LM35A LM35C LM35CA LM35D Precision Centigrade Temperature Sensors

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