Microchip公司的RE46C19是CMOS低压光电烟雾检测ASIC,符合标准UL217和 UL268,集成了可选增益的光放大器.RE46C19每10秒检测烟雾一次,如果检测到烟雾,将会发出告警信号.两节干电池工作,器件内部有红外二极管(IRED)驱动器,可调整IRED驱动电流以及静态灵敏度.本文介绍了RE46C190主要特性,方框图,电池应用电路图以及用于编程的应用电路图.The RE46C190 is a low power, low voltage CMOS photoelectric typesmoke detector IC. With minimal external components, this circuitwill provide all the required features for a photoelectric-typesmoke detector.The design incorporates a gain-selectable photo amplifier for usewith an infrared emitter/detector pair. An internal oscillator strobes power to the smoke detectioncircuitry every 10 seconds, to keep the standby current to aminimum. If smoke is sensed, the detection rate is increased toverify an Alarm condition. A high gain mode is available for pushbutton chamber testing.A check for a low battery condition is performed every 86 seconds,and chamber integrity is tested once every 43 seconds, when inStandby. The temporal horn pattern supports the NFPA 72 emergencyevacuation signal.An interconnect pin allows multiple detectors to be connected suchthat, when one unit alarms, all units will sound.An internal 9 minute timer can be used for a Reduced Sensitivitymode.Utilizing low power CMOS technology, the RE46C190 was designed foruse in smoke detectors that comply with Underwriters LaboratorySpecification UL217 and UL268.RE46C190主要特性:• Two AA Battery Operation• Internal Power On Reset• Low Quiescent Current Consumption• Available in 16L N SOIC• Local Alarm Memory• Interconnect up to 40 Detectors• 9 Minute Timer for Sensitivity Control• Temporal or Continuous Horn Pattern• Internal Low Battery and Chamber Test• All Internal Oscillator• Internal Infrared Emitter Diode (IRED) driver• Adjustable IRED Drive current• Adjustable Hush Sensitivity• 2% Low Battery Set Point图1.RE46C190方框图图2.RE46C190电池应用电路图图3.RE46C190用于编程的应用电路图(1)图4.RE46C190用于编程的应用电路图(2)
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