OV7725-Datasheet

©2007OmniVisionTechnologies,Inc.VarioPixel,OmniVision,andtheOmniVisionlogoareregisteredtrademarksofOmniVisionTechnologies,Inc.Version1.4,December17,2007OmniPixel2andCameraChiparetrademarksofOmniVisionTechnologies,Inc.Thesespecificationsaresubjecttochangewithoutnotice.AdvancedInformationDatasheetOV7725ColorCMOSVGA(640x480)CAMERACHIPTMSensorOmniision®withOmniPixel2TMTechnologyGeneralDescriptionTheOV7725CAMERACHIP™imagesensorisalowvoltageCMOSdevicethatprovidesthefullfunctionalityofasingle-chipVGAcameraandimageprocessorinasmallfootprintpackage.TheOV7725providesfull-frame,sub-sampledorwindowed8-bit/10-bitimagesinawiderangeofformats,controlledthroughtheSerialCameraControlBus(SCCB)interface.Thisdevicehasanimagearraycapableofoperatingatupto60framespersecond(fps)inVGAwithcompleteusercontroloverimagequality,formattingandoutputdatatransfer.Allrequiredimageprocessingfunctions,includingexposurecontrol,gamma,whitebalance,colorsaturation,huecontrolandmore,arealsoprogrammablethroughtheSCCBinterface.Inaddition,OmniVisionsensorsuseproprietarysensortechnologytoimproveimagequalitybyreducingoreliminatingcommonlighting/electricalsourcesofimagecontamination,suchasfixedpatternnoise,smearing,blooming,etc.,toproduceaclean,fullystablecolorimage.Features•Highsensitivityforlow-lightoperation•StandardSCCBinterface•OutputsupportforRawRGB,RGB(GRB4:2:2,RGB565/555/444)andYCbCr(4:2:2)formats•Supportsimagesizes:VGA,QVGA,andanysizescalingdownfromCIFto40x30•VarioPixel®methodforsub-sampling•Automaticimagecontrolfunctionsincluding:AutomaticExposureControl(AEC),AutomaticGainControl(AGC),AutomaticWhiteBalance(AWB),AutomaticBandFilter(ABF),andAutomaticBlack-LevelCalibration(ABLC)•Imagequalitycontrolsincludingcolorsaturation,hue,gamma,sharpness(edgeenhancement),andanti-blooming•ISPincludesnoisereductionanddefectcorrection•Lensshadingcorrection•Saturationlevelautoadjust(UVadjust)•Edgeenhancementlevelautoadjust•De-noiselevelautoadjust•FramesynchronizationcapabilityOrderingInformationPbNote:TheOV7725usesalead-freepackage.ProductPackageOV07725-VL1A(Color,lead-free)28-pinCSP2Applications•Cellularandpicturephones•Toys•PCMultimedia•DigitalstillcamerasKeySpecificationsFigure1OV7725Pinout(TopView)ArraySize640x480PowerSupplyDigitalCore1.8VDC+10%Analog3.0Vto3.6VI/O1.7Vto3.3VPowerRequirementsActive120mWtypical(60fpsVGA,YUV)Standby20µATemperatureRange-20°Cto+70°COutputFormat8-bit•YUV/YCbCr4:2:2•RGB565/555/444•GRB4:2:2•RawRGBData10-bit•RawRGBDataLensSize1/4LensChiefRayAngle25°nonlinearMaxImageTransferRate60fpsforVGASensitivity3.8V/(Lux•sec)S/NRatio50dBDynamicRange60dBScanModeProgressiveElectronicExposureUpto510:1(forselectedfps)PixelSize6.0µmx6.0µmDarkCurrent40mV/sWellCapacity26Ke-FixedPatternNoise0.03%ofVPEAK-TO-PEAKImageArea3984µmx2952µmPackageDimensions5345µmx5265µmA1ADVDDA2RSTBA3VREFHOV7725A4FSINA5SCLB1ADGNDB2VREFNB4AGNDB3AVDDB5SDAC1PWDND1D5E1D7E2D1E5DOVDDF1D9F2D3F3XCLKF4DOGNDF5D2A6D0B6HREFC6VSYNCD6D4E6D6F6D8E3DVDDE4PCLK7725CSP_DS_0012ProprietarytoOmniVisionTechnologies,Inc.Version1.4,December17,2007OV7725ColorCMOSVGAOmniPixel2™CAMERACHIP™SensorOmniisionFunctionalDescriptionFigure2showsthefunctionalblockdiagramoftheOV7725imagesensor.TheOV7725includes:•ImageSensorArray(totalarrayof656x488pixels,withactivepixels640x480inYUVmode)•AnalogSignalProcessor•A/DConverters•TestPatternGenerator•DigitalSignalProcessor(DSP)•ImageScaler•TimingGenerator•DigitalVideoPort•SCCBInterfaceFigure2FunctionalBlockDiagramcolumnsenseamprowselectimagearrayHREFPCLKVSYNCSCLRSTBFSINPWDNclockexposure/gaindetecttestpatterngeneratorFIFODSP*bufferbufferimagescaleranalogprocessingvideotiminggeneratorDSP*(lensshadingcorrection,de-noise,white/blackpixelcorrection,autowhitebalance,etc.)note1exposure/gaincontrolSCCBinterfaceXCLKSDAregistersA/DGRBD[9:0]videoport7725CSP_DS_002FunctionalDescriptionVersion1.4,December17,2007ProprietarytoOmniVisionTechnologies,Inc.3OmniisionImageSensorArrayTheOV7725sensorhasanimagearrayof664x490pixelsforatotalof325,360pixels,ofwhich640x480pixelsareactive(307,200pixels).Figure3showsacross-sectionoftheimagesensorarray.Figure3ImageSensorArrayTimingGeneratorIngeneral,thetiminggeneratorcontrolsthefollowingfunctions:•Arraycontrolandframegeneration•Internaltimingsignalgenerationanddistribution•Frameratetiming•AutomaticExposureControl(AEC)•Externaltimingoutputs(VSYNC,HREF/HSYNC,andPCLK)AnalogSignalProcessorThisblockperformsallanalogimagefunctionsincluding:•AutomaticGainControl(AGC)•AutomaticWhiteBalance(AWB)A/DConvertersAftertheAnalogProcessingblock,thebayerpatternRawsignalisfedtoa10-bitanalog-to-digital(A/D)convertersharedbyGandBRchannels.ThisA/Dconverteroperatesatspeedsupto12MHzandisfullysynchronoustothepixelrate(actualconversionrateisrelatedtotheframerate).InadditiontotheA/Dconversion,thisblockalsohasthefollowingfunctions:•DigitalBlack-LevelCalibration(BLC)•OptionalU/Vchanneldelay•AdditionalA/Drangecontrolsbluegreenmicrolensglassmicrolensmicrolensred7725CSP_DS_003Ingeneral,thecombinationoftheA/DRangeMultiplierandA/DRangeControlsetstheA/Drangeandmaximumvaluetoallowtheusertoa