低功耗霍尔元件DH471.docx

低功耗霍尔元件DH471.docx

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低功耗霍尔元件DH471

深圳凯祥科技有限公司DH47系列

V2.00Apr.25,20111/9

11.Features

Micropowerconsumptionforbatterypoweredapplications

Omnipolar,outputswitcheswithabsolutevalueofNorthor

Southpolefrommagnet

Operationdownto2.5V

Highsensitivityfordirectreedswitchreplacementapplications

CMOSoutput

2.Chopperstabilizedamplifierstage2．Description

TheDH471OmnipolarHalleffectsensorICisfabricatedfrommixedsignalCMOStechnology.Itincorporatesadvancedchopper-stabilizationtechniquestoprovideaccurateandstablemagneticswitchpoints.

ThecircuitdesignprovidesaninternallycontrolledclockingmechanismtocyclepowertotheHallelementandanalogsignalprocessingcircuits.Thisservestoplacethehighcurrent-consumingportionsofthecircuitintoa“Sleep”mode.Periodicallythedeviceis“Awakened”bythisinternallogicandthemagneticfluxfromtheHallelementisevaluatedagainstthepredefinedthresholds.IfthefluxdensityisaboveorbelowtheBop/Brpthresholdsthentheoutputtransistorisdriventochangestatesaccordingly.Whileinthe“Sleep”cycletheoutputtransistorislatchedinitspreviousstate.Thedesignhasbeenoptimizedforserviceinapplicationsrequiringextendedoperatinglifetimeinbatterypoweredsystems.

TheoutputtransistoroftheDH471willbelatchedon（Bop）inthepresenceofasufficientlystrongSouthorNorthmagneticfieldfacingthemarkedsideofthepackage.Theoutputwillbelatchedoff（Brp）intheabsenceofamagneticfield.

3．Applications

Solidstateswitch

HandheldWirelessHandsetAwakeSwitch

Lidclosesensorforbatterypowereddevices

Magnetproximitysensorforreedswitchreplacementinlowdutycycleapplications

4．TypicalApplicationCircuit

Innosen'spole-independentsensingtechniqueallowsfor

operationwitheitheranorthpoleorsouthpolemagnet

orientation,enhancingthemanufacturabilityofthedevice.

Thestate-of-the-arttechnologyprovidesthesameoutput

polarityforeitherpoleface.

Itisstronglyrecommendedthatanexternalbypasscapacitorbeconnected（incloseproximitytotheHallsensor）betweenthesupplyandgroundofthedevicetoreducebothexternalnoiseandnoisegeneratedbythechopper-stabilizationtechnique.Thisisespeciallytrueduetotherelativelyhighimpedanceofbatterysupplies.

5．FunctionalBlockDiagram

6．Pinning

MarkView

PinDescription

7．InternalTimingCircuit

8．AbsoluteMaximumRatings

absolute-maximumratedconditionsforextendedperiodsmayaffectdevicereliability.

9．DCElectricalCharacteristics

DCOperatingParameters:

TA=25℃,VDD=2.75V.

Time

Current

Isp

Iaw

Iav

10．MagneticCharacteristics

OperatingParameters:

TA=25℃,VDD=2.75VDC.

11．ESDProtection

12．PerformanceCharacteristics

13．UniqueFeatures

CMOSHallICTechnology

Thechopperstabilizedamplifierusesswitchedcapacitortechniquestoeliminatetheamplifier

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offsetvoltage,which,inbipolardevices,isamajorsourceoftemperaturesensitivedrift.CMOSmakesthisadvancedtechniquepossible.TheCMOSchipisalsomuchsmallerthanabipolarchip,allowingverysophisticatedcircuitrytobeplacedinlessspace.Thesmallchipsizealsocontributestolowerphysicalstressandlesspowerconsumption.

InstallationComments

ConsidertemperaturecoefficientsofHallICandmagnetics,aswellasairgapandlifetimevariations.Observetemperaturelimitsduringwavesoldering.TypicalIRsolder-reflowprofile:

NoRapidHeatingandCooling.

RecommendedPreheatingformax.2minutesat150?

C

RecommendedReflowingformax.5secondsat240?

C

14．ESDPrecautions

ElectronicsemiconductorproductsaresensitivetoElectroStaticDischarge（ESD）.AlwaysobserveElectroStaticDischargecontrolprocedureswheneverhandlingsemiconductorproducts.

15．PackageInformation

15.1TSOT-23PackagePhysicalCharacteristics

TSOT-23PackageHallLocation

0.300.60

3.00

EndView

Notes:

1）.PINOUT:

Pin1VDDPin2OutputPin3GND

2）.Alldimensionsareinmillimeters;

Marking:

47--CodeofDevice（DH471）;y--last1digitofyear;mm--ProductionLot

;

15.2TO-92PackagePhysicalCharacteristics

15.3DFN2020-3（QFN2020-3）PackagePhysicalCharacteristics

DFN2020-3PackageDimensionDFN2020-3HallPlate/ChipLocation

0.84（Nom）

Notes:

1）.Controllingdimension:

mm;

2）.Lesdsmustbefreeofflashandplatingvoids;3）.Donotbendleadswithin1mmofleadtopackage

interface;

4）.PINOUT:

Pin1VDDPin2GNDPin3OutputMarking:

47--CodeofDevice（ES247）;y--last1digitofyear;mm--ProductionLot;

ActiveAreaDepth:

Hall

plate

16.OrderingInformation

PartNo.TemperatureSuffixPackageCodeDH471E（-40℃to85℃）UA（TO-92S）

ST（TSOT-23）

DF（DFN2020-3）