TC620/TC621 5V, Dual Trip Point Temperature Sensors Features Package Type • UserProgrammableHysteresisand 8-PDIP TemperatureSetPoint NC 1 8 VDD (cid:127) EasilyProgramswith2ExternalResistors LOW SET 2 TC620XCPA 7 HIGH LIMIT (cid:127) WideTemperatureDetectionRange: HIGH SET 3 TC620XEPA 6 LOW LIMIT -0°Cto70°C:(TC620/TC621CCX) GND 4 5 CONTROL -40°Cto+125°C:(TC620/TC621CVX) -40°Cto+85°C:(TC620/TC621CEX) 8-PDIP -55°Cto+125°C:(TC620/TC621CMX) (cid:127) OnboardTemperatureSensingApplications THERMISTOR 1 8 VDD (TC620X) HIGH SET 2 TC621XCPA 7 HIGH LIMIT (cid:127) ExternalNTCThermistorforRemoteSensing LOW SET 3 TC621XEPA 6 LOW LIMIT Applications(TC621X) GND 4 5 CONTROL (cid:127) Availablein8-PinPDIPandSOICPackages 8-SOIC Applications NC 1 8 VDD LOW SET 2 TC620XCOA 7 LOW LIMIT (cid:127) PowerSupplyOverTemperatureDetection HIGH SET 3 TC620XEOA 6 HIGH LIMIT (cid:127) ConsumerEquipment TC620CVOA GND 4 5 CONTROL (cid:127) TemperatureRegulators 8-SOIC (cid:127) CPUThermalProtection THERMISTOR 1 8 VDD Device Selection Table HIGH SET 2 TC621XCOA 7 HIGH LIMIT LOW SET 3 TC621XEOA 6 LOW LIMIT Temperature PartNumber Package GND 4 5 CONTROL Range TC620X*COA 8-PinSOIC 0°Cto+70°C General Description TC620X*CPA 8-PinPDIP 0°Cto+70°C TheTC620andTC621areprogrammablelogicoutput TC620X*EOA 8-PinSOIC -40°Cto+85°C temperature detectors designed for use in thermal TC620X*EPA 8-PinPDIP -40°Cto+85°C management applications. The TC620 features an TC620C*VOA 8-PinSOIC -40°Cto+125°C onboard temperature sensor, while the TC621 connects to an external NTC thermistor for remote TC621X*COA 8-PinSOIC 0°Cto+70°C sensingapplications. TC621X*CPA 8-PinPDIP 0°Cto+70°C Both devices feature dual thermal interrupt outputs TC621X*EOA 8-PinSOIC -40°Cto+85°C (HIGH LIMIT and LOW LIMIT), each of which is pro- TC621X*EPA 8-PinPDIP -40°Cto+85°C grammedwithasingleexternalresistor.OntheTC620, theseoutputsaredrivenactive(high)whenmeasured NOTE:*ThepartcodewillbeCorH. temperature equals the user programmed limits. The (SeeFunctionalBlockDiagrams). CONTROL(hysteresis)outputisdrivenhighwhentem- perature equals the high limit setting and returns low whentemperaturefallsbelowthelowlimitsetting.This output can be used to provide ON/OFF control to a cooling fan or heater. The TC621 provides the same output functions except that the logical states are inverted. The TC620/TC621 are usable over operating temperature ranges of 0°C to 70°C, -40°C to +125°C and-55°Cto125°C.  2002MicrochipTechnologyInc. DS21439B-page 1

TC620/TC621 FunctionalBlock Diagrams VDD 8 Temp. to Voltage Converter TC620 4 + 7 2 VREF – LOW LIMIT LOW SET GEN VREF + 6 HIGH LIMIT HIGH SET 3 VREF – GEN R S Q Q 5 CONTROL* VDD 8 Thermistor 1 Interface THERMISTOR Circuit TC621 4 + 7 HIGH LIMIT HIGH SET 2 VREF – GEN VREF + 6 LOW LIMIT LOW SET 3 VREF – GEN R S Q Q 5 CONTROL* *Suffix code "C" denotes cooling option (High true CONTROL output). Suffix code "H" denotes heating option (Low true CONTROL output).  DS21439B-page 2 2002MicrochipTechnologyInc.

TC620/TC621 1.0 ELECTRICAL CHARACTERISTICS *Stressesabovethoselistedunder"AbsoluteMaximumRat- ings"maycausepermanentdamagetothedevice.Theseare Absolute Maximum Ratings* stressratings only and functional operation of the device at these or any other conditions above those indicated in the SupplyVoltage.......................................................20V operationsectionsofthespecificationsisnotimplied.Expo- InputVoltageAnyInput..(GND–0.3V)to(V +0.3V) sure to Absolute Maximum Rating conditions for extended DD PackagePowerDissipation(T ≤70°C) periodsmayaffectdevicereliability. A PDIP..............................................730mW SOIC..............................................470mW DeratingFactors: Plastic...........................................8mW/°C OperatingTemperature: MVersion.........................-55°Cto+125°C VVersion.........................-40°Cto+125°C EVersion...........................-40°Cto+85°C CVersion..............................0°Cto+70°C StorageTemperature.........................-65°Cto+150°C TC620/TC621ELECTRICALSPECIFICATIONS ElectricalCharacteristics:T =25°C,unlessotherwisespecified. A Symbol Parameter Min Typ Max Unit TestConditions V SupplyVoltageRange 4.5 — 18 V DD I SupplyCurrent — 270 400 µA 5V≤V ≤18V DD DD R OutputResistance — 400 1000 W OutputHighorLow,5V≤V ≤18V OUT DD I OutputCurrent — — 1 mA TempSensed Source/Sink OUT I OutputCurrent — — 1 mA Cool/Heat Source/Sink OUT T AbsoluteAccuracy T-3 T T+3 °C T=ProgrammedTemperature ERR  2002MicrochipTechnologyInc. DS21439B-page 3

TC620/TC621 2.0 PIN DESCRIPTIONS ThedescriptionsofthepinsarelistedinTable2-1. TABLE 2-1: PINFUNCTIONTABLE PinNo. (8-PinPDIP) (8-PinSOIC) Symbol Description 0°Cto+70°C -40°Cto+85°C -40°Cto+125°C 1 NC NoInternalConnection. 2 LOWSET Lowtemperaturesetpoint.Connectanexternal1%resistorfromLOWSETtoV DD tosettrippoint. 3 HIGHSET Hightemperaturesetpoint.Connectanexternal1%resistorfromHIGHSETto V tosettrippoint. DD 4 GND GroundTerminal. 5 CONTROL Controloutput. 6 HIGHLIMIT Hightemperaturepush/pulloutput. 7 LOWLIMIT Lowtemperaturepush/pulloutput. 8 V Powersupplyinput. DD PinNo. (8-PinPDIP) (8-PinSOIC) Symbol Description 0°Cto+70°C -40°Cto+85°C 1 THERMISTOR Thermistorinput. 2 HIGHSET Hightemperaturesetpoint.Connectanexternal1%resistorfromHIGHSETto V tosettrippoint. DD 3 LOWSET Lowtemperaturesetpoint.Connectanexternal1%resistorfromLOWSETto V tosettrippoint. DD 4 GND GroundTerminal. 5 CONTROL Controloutput. 6 LOWLIMIT Lowtemperaturepush/pulloutput. 7 HIGHLIMIT Hightemperaturepush/pulloutput. 8 V Powersupplyinput. DD  DS21439B-page 4 2002MicrochipTechnologyInc.

TC620/TC621 3.0 DETAILED DESCRIPTION Care must also be taken to ensure the LOW SET temperaturesettingisatleast5°ClowerthantheHIGH TheTC620hasapositivetemperaturecoefficienttem- SETtemperaturesetting. peraturesensorandadualthresholddetector.Temper- Figure3-2canhelptheuser obtainanestimateofthe ature set point programming is accomplished with external resistor values required for the desired LOW external resistors from the HIGH SET and LOW SET SETandHIGHSETtrippoints. inputstoV TheHIGHLIMITandLOWLIMIToutputs DD. remainlowaslongasmeasuredtemperatureisbelow FIGURE3-2: TC620SENSE setpointvalues.Asmeasuredtemperatureincreases, RESISTORS VS. TRIP theLOWLIMIToutputisdrivenhighwhentemperature equalstheLOWSETsetpoint(±3°Cmax).Iftempera- TEMPERATURE turecontinuestoclimb,theHIGHLIMIToutputisdriven 250 highwhentemperatureequalstheHIGHSETsetpoint (Figure3-1). The CONTROL (hysteresis) output is Ω) latched in itsactive stateat the temperature specified (k P 200 RI by the HIGH SET resistor. CONTROL is maintained RT active until temperature falls to the value specified by E, 150 C N theLOWSETresistor. A T SIS 100 E FIGURE3-1: TC620/TC621INPUTVS. R OUTPUTLOGIC 50 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE (˚C) High Set Point Temperature Low Set Point 3.2 Built-in Hysteresis Low Limit Output To prevent output "chattering" when measured High Limit Output temperature is at (or near) the programmed trip point values,theLOWSETandHIGHSETinputseachhave Control Output (Cool Option Control Output (Heat Option) built-in hysteresis of -2°C below the programmed settings(Figure3-3). 3.1 Programming the TC620 FIGURE3-3: BUILT-INHYSTERESISON LOWLIMITANDHIGH The resistor values to achieve the desired trip point LIMITOUTPUTS temperatures on HIGH SET and LOW SET are calculatedusingEquation3-1: EQUATION3-1: Set Point (Set Point 2˚C) R =0.5997xT2.1312 TRIP Where: R =ProgrammingresistorinOhms TRIP High Limit T=Thedesiredtrippointtemperatureindegrees or Low Limit Kelvin. Output Forexample,a50°CsettingoneithertheHIGHSET As shown, the outputs remain in their active state orLOWSETinputiscalculatedusingEquation3-2as (hysteresis) until temperature falls an additional 2°C follows: belowtheuser'ssetting. EQUATION3-2: R =0.5997x((50+273.15)2.1312)=133.6kΩ SET CaremustbetakentoensuretheLOWSETprogram- ming resistor is a smaller value than the HIGH SET programming resistor. Failure to do this will result in erroneousoperationoftheCONTROLoutput.  2002MicrochipTechnologyInc. DS21439B-page 5

TC620/TC621 3.3 Using the TC621 FIGURE3-4: TYPICALNTC THERMISTOR TheTC621operationissimilartothatoftheTC620,but requires an external NTC thermistor. Use the resis- 350 tance versus temperature curve of the thermistor to 300 determine the values of the programming resistors. NotethatthepinnumbersfortheHIGHSETandLOW 250 SveErTsupsrotghraatmomf itnhgereTsCis6t2o0rs(fio.er.t,hethTeCr6e2s1istaorrevreavlueersoend ΩCE (k) 200 N A HIGHSET[Pin2]shouldalwaysbelowerthantheone T SIS 150 connected to LOW SET [Pin 3]). Also note that the E R outputsoftheTC621areLOWTRUEwhenusedwith OR 100 T anNTCthermistor. MIS R 50 E H 3.4 TC621 ThermistorSelection T 0 0 10 20 30 40 50 60 70 TheTC621usesanexternalthermistor tomonitorthe TEMPERATURE (˚C) controllingtemperature.Athermistorwitharesistance value of approximately 100kΩ at 25°C is 3.5 TC620/TC621 Outputs recommended. Bothdeviceshavecomplimentaryoutputstages.They Atemperaturesetpointisselectedbypickingaresis- areratedatasourceorsinkcurrentof1mAmaximum. tor whosevalue isequaltotheresistance of thether- mistoratthedesiredtemperature.Forexample,using thedatashowninFigure3-4,a30kΩresistorbetween HIGH TEMP (Pin 2) and V (Pin 8) sets the high DD temperaturetrippointat+51°Canda49kΩresistoron LOWTEMP(Pin3)setsthelowtemperaturetrippoint to+41°C.  DS21439B-page 6 2002MicrochipTechnologyInc.

TC620/TC621 4.0 TYPICAL APPLICATIONS 4.2 Temperature Controlled Fan IntheapplicationinFigure4-2, ahighandalowtem- 4.1 DualSpeed Temperature Control perature is selected by two R and R . The TC620 L H In Figure4-1, the Dual Speed Temperature Control monitors the ambient temperature and turns the FET uses a TC620 and a TC4469 quad driver. Two of the switch on when the temperature exceeds the HIGH driversoftheTC4469areconfiguredinasimpleoscil- TEMPsetpoint.Thefanremainsonuntilthetempera- lator. Whenthetemperature isbelow theLOW TEMP ture decreases to the LOW TEMP set point. This setpoint,theoutputofthedriverisOFF.Whenthetem- provides the hysteresis. In this application, the fan perature exceeds the LOW TEMP set point, the turnsononlywhenrequired. TC4469gatestheoscillatorsignaltotheoutputsofthe TheTC621usesanexternalthermistor tomonitorthe driver.Thissquarewavesignalmodulatestheremain- ambient temperature. This adds one part, but allows ingoutputsanddrivesthemotoratalowspeed.Ifthis more flexibility with the location of the temperature speed cannot keep the temperature below the HIGH sensor. TEMP set point, then the driver turns on continuously whichincreasesthefanspeedtohigh.TheTC620will monitorthetemperatureandonlyallowthefantooper- atewhenneededandattherequiredspeedtomaintain thedesiredtemperature.Ahigherpoweroptioncanbe designedbyaddingaresistorandapowerMOSFET. FIGURE4-1: DUAL SPEEDTEMPERATURE CONTROL +12V VMOTOR 0.1µF 10µF 1M Fan Motor Low Temp 8 14 30˚ C High 1N4148 100k 2 6 2 13 3 Limit 1 4 50Ω MOSFET TC620 1 3 6 50pF High Temp. 1N4148 TC4469 50˚ C 5 Low 7 5 9 Limit 8 10 Higher Power Option 11 4 Temperature Scale 12 0˚ C – 30 ˚ C (Fan Off) 1µF 10k 7 Fan Motor 30˚ C – 50 ˚ C (Fan Low) 50˚ C – UP (Fan High) FIGURE4-2: TEMPERATURE CONTROLLEDFAN +12V +12V Thermistor (NTC) Low Temp. 1 8 Fan Motor High 1 8 Fan Motor RL Temp. 2 TC620 7 2 TC621 7 3 6 RH 3 6 RH 4 5 MTP3055E Low Temp. RL 4 5 MTP3055E High Temp.  2002MicrochipTechnologyInc. DS21439B-page 7

TC620/TC621 FIGURE4-3: HEATINGANDCOOLINGAPPLICATION 4.5V to 18V High Low Temp. Temp. 1 8 1 14 1k 2 7 2 13 TC620 3 6 3 12 4 5 4 TC4469 11 1k High Low 5 10 Temp. Temp. 6 9 Warning Warning 7 8 Heating/Cooling Equipment  DS21439B-page 8 2002MicrochipTechnologyInc.

TC620/TC621 5.0 PACKAGING INFORMATION 5.1 Package Marking Information Packagemarkingdatanotavailableatthistime. 5.2 Taping Form Component Taping Orientation for 8-Pin SOIC (Narrow) Devices User Direction of Feed PIN 1 W P Standard Reel Component Orientation for TR Suffix Device Carrier Tape, Number of Components Per Reel and Reel Size Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 8-Pin SOIC (N) 12 mm 8 mm 2500 13 in 5.3 Package Dimensions 8-Pin Plastic DIP PIN1 .260 (6.60) .240 (6.10) .045 (1.14) .070 (1.78) .030 (0.76) .040 (1.02) .310 (7.87) .400 (10.16) .290 (7.37) .348 (8.84) .200 (5.08) .140 (3.56) .040 (1.02) .020 (0.51) .015 (0.38) 3°MIN. .150 (3.81) .008 (0.20) .115 (2.92) .400 (10.16) .310 (7.87) .110 (2.79) .022 (0.56) .090 (2.29) .015 (0.38) Dimensions: inches (mm)  2002MicrochipTechnologyInc. DS21439B-page 9

TC620/TC621 Package Dimensions (Continued) 8-Pin SOIC PIN1 .157 (3.99) .244 (6.20) .150 (3.81) .228 (5.79) .050 (1.27) TYP. .197 (5.00) .189 (4.80) .069 (1.75) .053 (1.35) 8°MAX.. .010 (0.25) .007 (0.18) .020 (0.51) .010 (0.25) .013 (0.33) .004 (0.10) .050 (1.27) .016 (0.40) Dimensions: inches (mm)  DS21439B-page 10 2002MicrochipTechnologyInc.

TC620/TC621 SALES AND SUPPORT DataSheets ProductssupportedbyapreliminaryDataSheetmayhaveanerratasheetdescribingminoroperationaldifferencesandrecom- mendedworkarounds.Todetermineifanerratasheetexistsforaparticulardevice,pleasecontactoneofthefollowing: 1. YourlocalMicrochipsalesoffice 2. TheMicrochipCorporateLiteratureCenterU.S.FAX:(480)792-7277 3. TheMicrochipWorldwideSite(www.microchip.com) Pleasespecifywhichdevice,revisionofsiliconandDataSheet(includeLiterature#)youareusing. NewCustomerNotificationSystem Registeronourwebsite(www.microchip.com/cn)toreceivethemostcurrentinformationonourproducts.  2002MicrochipTechnologyInc. DS21439B-page11

TC620/TC621 NOTES:  DS21439B-page 12 2002MicrochipTechnologyInc.

TC620/TC621 Information contained in this publication regarding device Trademarks applicationsandthelikeisintendedthroughsuggestiononly andmaybesupersededbyupdates.Itisyourresponsibilityto The Microchip name and logo, the Microchip logo, FilterLab, ensure that your application meets with your specifications. KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER, No representation or warranty is given and no liability is PICSTART,PROMATE, SEEVAL and TheEmbedded Control assumedbyMicrochipTechnologyIncorporatedwithrespect SolutionsCompanyareregisteredtrademarksofMicrochipTech- totheaccuracyoruseofsuchinformation,orinfringementof nologyIncorporatedintheU.S.A.andothercountries. patentsorotherintellectualpropertyrightsarisingfromsuch dsPIC,ECONOMONITOR,FanSense,FlexROM,fuzzyLAB, useorotherwise.UseofMicrochip’sproductsascriticalcom- In-Circuit Serial Programming, ICSP, ICEPIC, microPort, ponentsinlifesupportsystemsisnotauthorizedexceptwith Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, expresswritten approvalbyMicrochip.Nolicensesarecon- MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode veyed,implicitlyorotherwise,underanyintellectualproperty andTotalEndurancearetrademarksofMicrochipTechnology rights. IncorporatedintheU.S.A. SerializedQuickTurnProgramming(SQTP)isaservicemark ofMicrochipTechnologyIncorporatedintheU.S.A. All other trademarks mentioned herein are property of their respectivecompanies. © 2002, Microchip Technology Incorporated, Printed in the U.S.A.,AllRightsReserved. Printedonrecycledpaper. MicrochipreceivedQS-9000qualitysystem certificationforitsworldwideheadquarters, designandwaferfabricationfacilitiesin ChandlerandTempe,ArizonainJuly1999 andMountainView,CaliforniainMarch2002. TheCompany’squalitysystemprocessesand proceduresareQS-9000compliantforits PICmicro®8-bitMCUs,KEELOQ®codehopping devices,SerialEEPROMs,microperipherals, non-volatilememoryandanalogproducts.In addition,Microchip’squalitysystemforthe designandmanufactureofdevelopment systemsisISO9001certified.  2002MicrochipTechnologyInc. DS21439B-page13

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Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: M icrochip: TC620CCOA713 TC620CVOA713 TC620HEOA713 TC621CEOA TC621HEOA TC620CCOA TC620CCPA TC620CEOA713 TC620CVOA TC620HCOA713 TC620HCPA TC620HEOA TC621CCPA TC621HCOA713 TC621CCOA TC621CEOA713 TC621HCOA TC621HEOA713 TC621HEPA TC621CCOA713