RE46C122

R&E International 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 Telephone 610.992.0727 Page 8 of 10 E-mail: rande@randeint.com DS-RE46C122-121806 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 RE46C122 CMOS Ionization Smoke Detector ASIC with Interconnect and Timer Mode Product Specification R&E International Timing Diagram (Timer Mode) Oscillator 10.5mS 1.67S Internal Clock TSTART TLOF3 LED Outputs High Z TSTROBE TTPER Telephone 610.992.0727 Page 9 of 10 E-mail: rande@randeint.com DS-RE46C122-121806 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 RE46C122 CMOS Ionization Smoke Detector ASIC with Interconnect and Timer Mode 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 10 of 10 E-mail: rande@randeint.com DS-RE46C122-121806 This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734