RE46C120

R&E International RE46C120 CMOS Ionization Smoke Detector ASIC Product Specification General Description The RE46C120 is low power CMOS ionization type smoke detector IC. With a 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. The Tone input allows for selection of a temporal pattern or a 2/3 duty cycle continuous tone. The temporal horn pattern supports the NFPA 72 emergency evacuation signal. Although this device was designed for smoke detection utilizing an ionization chamber it could be used in a variety of security applications. Utilizing low power CMOS technology the RE46C120 was designed for use in smoke detectors that comply with Underwriters Laboratory Specification UL217 and UL268. Features • • • • • • • • • • Guard Outputs for Ion Detector Input +/-0.75pA Detect Input Current Internal Reverse Battery Protection Internal Low Battery Detection Pin Selectable Horn Pattern Low Quiescent Current Consumption ( Pin 15; 130m Level Shift on Pin 13 V Pin 15 > Pin 13 1.67S 10m S Internal Clock 24 Clock Cycles (40 S) 24 Clock Cycles (1S) LED DETCOMP (pin1) Sample (2/3 Duty) Sample (NFPA72) THON3 THOF3 Low Battery Warning Chirp Horn (2/3 Duty Cycle, TONE=VSS) Low Battery Warning Chirp Horn (NFPA72, TONE=Open or VDD) See Figure Below for Com plete Tem poral Horn Cycle Notes: 1. Smoke is not sampled when the horn is active so the horn cycle is self completing 2. Low battery warning chirp is suppressed in alarm THON1 THOF1 THOF2 Complete Temporal Horn Pattern Telephone 610.992.0727 Page 6 of 7 E-mail: rande@randeint.com DS-RE46C120-010907 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 RE46C120 CMOS Ionization Smoke Detector ASIC Product Specification R&E International R&E INTERNATIONAL, Inc. reserves the right to make changes without further notice to any products herein to improve reliability, function or design. R&E INTERNATIONAL, Inc. does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. R&E INTERNATIONAL, Inc. products are not authorized for use as critical components in life support devices or systems without the express written approval of the President of R&E INTERNATIONAL, Inc. Life support devices or systems are devices or systems which are intended for surgical implant into the body to support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. Telephone 610.992.0727 Page 7 of 7 E-mail: rande@randeint.com DS-RE46C120-010907 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734