Datasheet Microchip RE46C200 — Datenblatt

RE46C200
9V Programmable Photoelectric Smoke Detector ASIC
Features Description 6.5-12V Operation Low Quiescent Current Programmable Internal Infrared Emitter Diode
(IRED) Current Programmable Standby Alarm Level Programmable Hushв„ў Alarm Level Programmable Hysteresis Alarm Level Programmable Chamber Test Alarm Level Programmable Low Battery Test Programmable Low-Battery Hush Programmable Horn Pattern Horn Synchronization 10-year End-of-Life Indication Differentiated Chamber Fail and Low Battery
Warnings Local Alarm Memory Interconnect up to 40 Detectors IO Filter and Charge Dump Smart IO for CO alarm Option 9-Minute or 80-Second Hush Timer Smart HushВ® Option Automatic Alarm Locate for Interconnected Units The RE46C200 is a next generation low power 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 on-chip oscillator strobes power to the smoke
detection circuitry for 5 ms every 10 seconds to keep
standby current to a minimum.
A check for a low battery condition is performed every
80 seconds and chamber test is performed once every
320 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. A charge dump feature will quickly discharge
the interconnect line when exiting a local alarm. The …