红外传感器/监视器唤醒主机系统

MAX971）和光电二极管的组合被用于电视机遥控器红外（IrDA）信号检测等RC滤波器，减少环境光噪声和交流电的嗡嗡声。电路的输出可以驱动一个CMOS设置复位触发器或中断一个沉睡的微处理器。Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSMISCELLANEOUSCIRCUITSKeywords:infraredsensor,infraredmonitor,lowsupplycurrentcomparator,comparatorplusreference,Oct13,1997photodiode,IrDAsignals,TVremotecontrolAPPLICATIONNOTE1101IRSensor/MonitorWakesHostSystemAbstract:Thecombinationofanultralowsupplycurrent,comparatorplusreference(MAX971)andphotodiodeareusedtodetectinfrared(IrDA)signalsforTVremotecontrol,etc.RCfiltersreduceambientlightnoiseandACmainshum.Thecircuit'soutputcandriveaCMOSset-resetflip-floporinterruptasleepingmicroprocessor.Thesensor/monitorcircuitofFigure1"wakesup"thehostsystemondetectionofinfrared(IR)signals.Itdrawssolittlesupplycurrentthatitcanrema