Si1120DataSheet.pdf

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1、Si1120PROXIMITY/AMBIENTLIGHTSENSORWITHPWMOUTPUTFeaturesPinAssignmentsTypically50cmmeterproximityHighEMIimmunitywithoutrangewithsinglepulseshieldedpackagingSevenprecisionopticalPowersupply:2.2–3.7VSi1120measurementmodes:Operatingtemperaturerange:3proximityranges–40to+85°CODFN3dcambie

2、ntrangesTypical10µAcurrentPRX18VSS1calibrationmodeconsumptionTXGD27MDLow-noiseambientcancellingProgrammable400/50mALEDcircuitallowsmaximumTXO36SCconstantcurrentdriveroutputsensitivitywith8–12bitresolutionSTX45VDDAllowsindependentLEDsupplyALSworksindirectsunlightvoltage(100klux)Smallo

3、utline3x3mm(ODFN)MinimumreflectancesensitivityU.S.Patent#5,864,591<1µW/cm2U.S.Patent#6,198,118OtherpatentspendingApplicationsHandsetsNotebooks/PCsTouchlessswitchesIndustrialautomationOccupancysensorsDisplaybacklightingcontrolConsumerelectronicsPhoto-interrupterDescriptionTheSi1120is

4、alow-power,reflectance-basedproximityandambientlightsensorwithadvancedanalogsignalprocessingandanalogPWMoutput.Itincludesanintegrateddifferentialphotodiode,signalprocessor,andLEDdriver.Proximitysensingisbasedonthemeasurementofreflectedlightfromanexternal,optically-isolated,strobedLED.Asepara

5、tevisiblelightphotodiodeisusedforambientlightsensing.ThestandardpackagefortheSi1120isan8-pinODFN.PreliminaryRev.0.4210/09Copyright©2009bySiliconLaboratoriesSi1120Thisinformationappliestoaproductunderdevelopment.Itscharacteristicsandspecificationsaresubjecttochangewithoutnotice.Si1120Function

6、alBlockDiagramAmbientLightSourcesTransparentTransparentwindowwindowMUXAMPCMPPRXPWMInfraredOutputBUFemitterIRVISProductVDDRAMPVREGCaseGENSTXOpticalBlockTXOMODESCCTRLTXMDVSSTXGD3.3VVDD/DC+P0.0/VREFC11.0uFP0.1/AGNDSi1120P0.2/XTAL1PRXVSSGND/DC-P0.3/XTAL2P0.4/TXTXGDMDP0.5/RXP0.6/CNVSTRSCTXOP0.7/I

7、REF0STXVDDP1.0C8051F931P1.1P1.2DCENP1.3P1.4VBATR1P1.5TXLEDP1.630ohmC2C3XTAL3C410uF0.1uFGNDXTAL468.0uFRST/C2CKP2.7/C2DFigure1.Si1120TypicalApplicationExampleofDigitalProximityandAmbientLightSensorwithC8051F931MCUandI2CInterface2PreliminaryRev.0.42Si