Si1102 Data Sheet

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1、Si1102OPTICALPROXIMITYDETECTORFeaturesPinAssignmentsHigh-performanceproximityHighEMIimmunitywithoutdetectorwithasensingrangeofupshieldedpackagingto50cm.2to5.25VpowersupplySi1102Single-pulsesensingmodeforlowOperatingtemperaturerange:ODFNsystempower–40to+85°CAdjustabledetectionthresholdandTypi

2、cal10µAcurrentconsumptionPRX18VSSstrobefrequencyandultra-lowpowerof1mAtypicalTXGD27FRProximity(PRX)statuslatchCurrentdriven(400mA)orenablescontrollingdevicestosaturatedLEDdriveroutputTXO36SRENavoidmissingadetectionSmalloutline:3x3mm(ODFN)DNC45VDDApplicationsU.S.Patent5,864,591ProximitysensingT

3、ouchlessswitchU.S.Patent6,198,118Photo-interrupterObjectdetectionU.S.Patent7,486,386OccupancysensingHandsetsIntrusion/tamperdetectionOtherpatentspendingDescriptionTheSi1102isahigh-performance(0–40cm)activeproximitydetector.Becauseitoperatesonanabsolutereflectancethresholdprinciple,itavoidsthea

4、mbiguityofmotion-basedproximitysystems.TheSi1102consistsofapatented,high-EMIimmunity,differentialphotodiodeandasignal-processingICwithLEDdriverandhigh-gainopticalreceiver.Proximitydetectionisbasedonmeasurementsofreflectedlightfromastrobed,optically-isolatedLED.ThestandardpackagefortheSi1102isan8-pi

5、nODFN.FunctionalBlockDiagramReflectance-BasedProximityDetectionHi-LoThresholdPRXOutputSignalInfraredprocessingemitterSRENIRFRProductOscillatorShutdownCasecontrolTXOVDDLEDDriveVSSPreliminaryRev.0.810/09Copyright©2009bySiliconLaboratoriesSi1102Thisinformationappliestoaproductunderdevelopment.Itschara

6、cteristicsandspecificationsaresubjecttochangewithoutnotice.Si1102Figure1.SimpleOn/OffDetector2PreliminaryRev.0.8Si1102TABLEOFCONTENTSSectionPage1.ElectricalSpecifications...................................................42.TypicalApplicationSchematic..............................................63

7、.ApplicationInformation....................................................73.1.TheoryofOperation..................................................73.2.ChoiceofLEDandLEDCurrent..............................