RE46C122

R&E International A Subsidiary of Microchip Technology Inc. RE46C122 CMOS Ionization Smoke Detector ASIC with Interconnect and Timer Mode Product Specification General Description The RE46C122 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. The temporal horn pattern supports the NFPA 72 emergency evacuation signal. An interconnect pin allows multiple detectors to be connected such that when one units alarms all units will sound. An internal 10 minute timer allows for a separate button to be used for reduced sensitivity mode. 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 RE46C122 was designed for use in smoke detectors that comply with Underwriters Laboratory Specification UL217 and UL268. Features • • • • • • • • • • • >1500V ESD Protection (HBM) on all Pins Guard Outputs for Ion Detector Input +/-0.75pA Detect Input Current Internal Reverse Battery Protection Low Quiescent Current Consumption ( Pin 15; 130mV Level Shift on Pin 13 Pin 15 > Pin 13 1.67S 10.5mS Internal Clock 24 Clock Cycles (40 S) 24 Clock Cycles (1S) LED Sample Smoke Low Battery Warning Chirp Horn See Figure Below for Complete Horn Cycle TIODLY1 IO (Pin 2) as Output IO Charge Dump TIOFILT Timing not same scale as above IO ( Pin 2) as Input TIODLY2 LED supressed in remote alarm mode Horn Start of horn temporal pattern is not synchronized to an external alarm Horn pattern not self completing for external alarm,see timing below for complete horn cycle Internal Clock Notes: 1. Smoke is not sampled when the horn is active. Horn cycle is self completing in local alarm. 2. Low battery warning chirp is suppressed in local or remote alarm 3. IO Dump active only in local alarm, inactive if external alarm THON1 THOF1 THOF2 Complete Temporal Horn Pattern © 2009 Microchip Technology Inc. DS22173A-page 8 RE46C122 CMOS Ionization Smoke Detector ASIC with Interconnect and Timer Mode Product Specification R&E International A Subsidiary of Microchip Technology Inc. Timing Diagram (Timer Mode) Oscillator 10.5mS 1.67S Internal Clock TSTART TLOF3 LED Outputs High Z TSTROBE TTPER © 2009 Microchip Technology Inc. DS22173A-page 9 RE46C122 CMOS Ionization Smoke Detector ASIC with Interconnect and Timer Mode Product Specification Trademarks The Microchip name and logo, the Microchip logo, Accuron, dsPIC, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART, rfPIC, SmartShunt and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. FilterLab, Hampshire, Linear Active Thermistor, MXDEV, MXLAB, SEEVAL, SmartSensor and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. Analog-for-the-Digital Age, Application Maestro, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN, ECONOMONITOR, FanSense, In-Circuit Serial Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB, MPLINK, mTouch, nanoWatt XLP, PICkit, PICDEM, 32 logo, PowerCal, PowerInfo, PICDEM.net, PICtail, PIC PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, Total Endurance, TSHARC, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © 2009, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. R&E International A Subsidiary of Microchip Technology Inc. Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights. Microchip received ISO/TS-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. The Company’s quality system processes and procedures are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified. © 2009 Microchip Technology Inc. DS22173A-page 10