Rev.1.415/15版权©2015SiliconLaboratoriesSi1141/42/43Si1141/42/43带I2C接口的临近/环境光传感器IC功能应用说明Si1141/42/43是基于反射的低功率红外线临近和环境光传感器,带有I2C数字接口和可编程事件中断输出。此非接触传感器IC包括模拟到数字转换器、集成高灵敏度可见和红外线光电二极管、数字信号处理器和具有十五个可选驱动电平的一个、两个或三个集成红外线LED驱动器。Si1141/42/43在广泛的动态范围和包括阳光直射在内的各种光源下可提供优异性能。Si1141/42/43还可以在深色玻璃盖下工作。光电二极管响应和关联的数字转换电路对人造光闪烁噪声和自然光颤动噪声具有优异的抗扰性。Si1142/43具有两个或多个LED,能够支持多轴式临近运动探测。Si1141/42/43器件在10引线2x2mmQFN封装中提供,能够在–40至+85°C温度范围中在1.71至3.6V的条件下运行。集成红外线临近探测器临近探测可从1cm以下调节到超过200cm三个独立的LED驱动器每个LED驱动器有15个电流设置,从5.6mA到360mA25.6µsLED驱动器脉冲宽度50cm临近范围,具有单个脉冲(3klx)15cm临近范围,具有单个脉冲(3klx)运行时高达128klx(阳光直射)高反射灵敏度1µW/cm2高电磁抗扰性,无屏蔽封装集成环境光传感器分辨率可以达到100mlx,允许在深色玻璃下工作在两个ADC范围设置之间动态范围可以达到1至128klx使用红外校正算法可以准确测量照明度业界最低的功耗1.71至3.6V电源电压9µA平均电流(180mA和3µASi114x电源时每800msLED脉冲25.6µs)500nA待机电流25.6µsLED“开启”时间使总功耗占空比较低,不会影响性能和抗扰度支持内部和外部唤醒内置电压电源监控器和接通电源复位控制器串行通信数据速率高达3.4Mbps从模式硬件地址解码(0x5A)小外形10引线2x2mmQFN温度范围–40至+85°C手机心率监控脉搏血氧计可穿戴音频产品安全面板窜改探测电路分配器阀门控制烟雾探测器非接触开关非接触滑动器占位传感器消费类电子设备工业自动化显示屏背光控制光中断器PinAssignmentsLED1VDDSCLGNDINT2349876QFN-10LED3/CVDDLED2/CVDDSDA1DNC105DNCSi1141/42/432Rev.1.41功能框图Figure1.Si1141BasicApplicationFigure2.Si1143ApplicationwithThreeLEDsandSeparateLEDPowerSupply注:有关更多的应用示例,请参阅“AN498:Si114x设计者指南”。VisibleVDDSDASCLRegulatorI2CLEDDriversLED1LED32LED21GNDINTInfraredRegistersAMUXADCTempFilterOscillatorDigitalSequencer&ControlLogic1.Si1142andSi1143only.MustbetiedtoVDDwithSi1141.2.Si1143only.MustbetiedtoVDDwithSi1141andSi1142.SDASCLVDDINTLED1GNDCVDDCVDDSi114115µF,20%,6V30ohm5%,1/16W3.3V0.1uFHostSDASCLINTSDASCLVDDINTLED1GNDLED3LED2Si114322uF,20%,6V30ohm5%,1/16W3.3V0.1uFHost4.3VNoPopSi1141/42/43Rev.1.413目录章节页码电气规格..................................................................4性能表................................................................4典型性能图............................................................10功能描述..................................................................12简介.................................................................12临近感应(PS)..........................................................12环境光...............................................................13主机接口.............................................................14运行模式..................................................................17关闭模式..............................................................17初始化模式............................................................17备用模式..............................................................17强制转换模式..........................................................17自发运行模式..........................................................18编程指南..................................................................19命令和响应结构........................................................19命令协议..............................................................20资源汇总..............................................................23信号通路软件模型......................................................28I2C寄存器............................................................29参数RAM.............................................................52引脚说明..................................................................67订购指南..................................................................68包装外形:10引脚QFN.....................................................69建议的PCB焊盘图案........................................................71文档更改列表..............................................................73联系信息..................................................................75Si1141/42/434Rev.1.411.电气规格1.1.性能表Table1.RecommendedOperatingConditionsParameterSymbolConditionMinTypMaxUnitVDDSupplyVoltageVDD1.71—3.6VVDDOFFSupplyVoltageVDD_OFFOFFmode–0.31.0VVDDSupplyRippleVoltageVDD=3.3V1kHz–10MHz——50mVppOperatingTemperatureT–402585°CSCL,SDA,InputHighLogicVoltageI2CVIHVDDx0.7—VDDVSCL,SDAInputLowLogicVoltageI2CVIL0—VDDx0.3VPSOperationunderDirectSunlightEdc——128klxIrLEDEmissionWavelengthl750850950nmIrLEDSupplyVoltageVLEDIrLEDVF=1.0VnominalVDD—4.3VIrLEDSupplyRippleVoltageAppliesifIrLEDsuseseparatesupplyrail0–30kHz30kHz–100MHz————250100mVppmVppStart-UpTimeVDDabove1.71V25——msLED3VoltageStart-upVDDx0.77——VTable2.PerformanceCharacteristics1ParameterSymbolConditionMinTypMaxUnitIDDOFFModeIoffVDDVDD_OFF(leakagefromSCL,SDA,andINTnotincluded)—2401000nAIDDStandbyModeIsbNoALS/PSConversionsNoI2CActivityVDD=1.8V—150500nANotes:1.UnlessspecificallystatedinConditions,electricaldataassumesambientlightlevels1klx.2.Proximity-detectionperformancemaybedegraded,especiallywhenthereishighopticalcrosstalk,iftheLEDsupplyandvoltagedropallowthedrivertosaturateandcurrentregulationislost.3.Guaranteedbydesignandcharacterization.4.RepresentsthetimeduringwhichthedeviceisdrawingacurrentequaltoIactiveforpowerestimationpurposes.Assumesdefaultsettings.Si1141/42/43Rev.1.415IDDStandbyModeIsbNoALS/PSConversionsNoI2CActivityVDD=3.3V—1.4—µAIDDActivelyMeasuringIactiveWithoutLEDinfluence,VDD=3.3V—4.35.5mAPeakIDDwhileLED1,LED2,orLED3isActivelyDrivenVDD=3.3V—8—mALEDDriverSaturationVoltage