RE46C129 DataSheet
http://www.microchip.com/stellent/images/mchpsiteimages/dwnfolder.gifCMOS Ionization Smoke Detector ASIC with InterconnectThe RE46C129 is low power CMOS ionization type smoke detector IC. With few external components this circuit will provide all the required features for an ionization type smoke detector. An internal oscillator strobes power to the smoke detection circuitry for 10.5mS every 1.66 seconds to keep standby current to a minimum. A check for a low battery condition is performed every 40 seconds when in standby. An interconnect pin allows multiple detectors to be connected such that when one units alarms all units will sound. Although this device was designed for smoke detection utilizing an ionization chamber it could be used in a variety of security applications. The RE46C129 was designed for use in smoke detectors that comply with Underwriters Laboratory Specification UL217 and UL268.
Parameter NameValue
TypeIonization
Horn Driver Alarm PatternContinuous Tone
Low Battery DetectTrue
Reverse Battery ProtectionTrue
Alarm InterconnectTrue
Sensitivty TimerFalse
Powerup Low BatteryTrue
Operating Temperature Range (C)-10C to 60C
Features
Guard Outputs for Ion Detector Input
+/-0.75pA Detect Input Current
Internal Reverse Battery Protection
Low Quiescent Current Consumption (<6.5uA)
Available in 16L PDIP or 16L N SOIC
ESD Protection on all Pins
Internal Low Battery Detection
Interconnect up to 40 Detectors
Compatible with Allegro A5350
Available in Standard Packaging or RoHS Compliant Pb Free Packaging.
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