Microchip RE46C190低压烟雾检测可编程解决方案

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 type smoke detector IC. With minimal external components, this circuit will provide all the required features for a photoelectric-type smoke detector.

The design incorporates a gain-selectable photo amplifier for use with an infrared emitter/detector pair.

An internal oscillator strobes power to the smoke detection circuitry every 10 seconds, to keep the standby current to a minimum. If smoke is sensed, the detection rate is increased to verify an Alarm condition. A high gain mode is available for push button chamber testing.

A check for a low battery condition is performed every 86 seconds, and chamber integrity is tested once every 43 seconds, when in Standby. The temporal horn pattern supports the NFPA 72 emergency evacuation signal.

An interconnect pin allows multiple detectors to be connected such that, when one unit alarms, all units will sound.
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