Microchip RE46C162-163烟雾检测与告警方案

Microchip 公司的RE46C162/163是低功耗CMOS离子型烟雾检测IC,几乎不用外接元件就能构成离子型烟雾检测器所需的所有功能. RE46C162/163引脚选择报警方式,具有告警存储器和灵敏的控制定时器,ESD保护大于1500V,检测输入电流±0.75 pA,电池使用寿命10年,主要用在住宅区和商业楼房烟雾检测与告警.本文介绍了RE46C162/163主要特性,方框图以及短暂报警和连续声报警应用电路图.

CMOS Ionization Smoke Detector ASIC with Interconnect, Timer Mode and Alarm Memory

The RE46C162/163 devices are low-power, CMOS ionization type, smoke detector ICs. With few external components, these circuits will provide all the required features for an ionization type smoke detector.

An internal oscillator strobes power to the smoke detection circuitry for 10.5 ms every 1.67 seconds to keep standby current to a minimum. A check for a low battery condition is performed every 40 seconds when in standby. The temporal horn pattern supports the NFPA 72 emergency evacuation signal.

An interconnect pin allows multiple detectors to be connected so when one unit alarms, all units will sound. A charge dump feature will quickly discharge the interconnect line when exiting a local alarm. The interconnect input is also digitally filtered.

An internal timer allows for a single button, push-to-test to be used for a reduced sensitivity mode.
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