RE46C163E16F Microchip

RE46C162/163 CMOS Ionization Smoke Detector ASIC with Interconnect, Timer Mode and Alarm Memory Features Description Pin Selectable Horn Patterns The RE46C162/163 devices are low-power, CMOS ionization type, smoke detector ICs. With few external Alarm Memory components, these circuits will provide all the required Sensitivity Control Timer: features for an ionization type smoke detector. - 8 minute Timer for RE46C162 An internal oscillator strobes power to the smoke - 1 minute Timer for RE46C163 detection circuitry for 10.5 ms every 1.67 seconds to >1500V ESD Protection (HBM) on All Pins keep standby current to a minimum. A check for a low Guard Outputs for Ion Detector Input battery condition is performed every 40 seconds when 0.75 pA Detect Input Current in standby. The temporal horn pattern supports the NFPA 72 emergency evacuation signal. Internal Reverse Battery Protection Low Quiescent Current Consumption (<6.5 A) An interconnect pin allows multiple detectors to be connected so when one unit alarms, all units will sound. I/O Filter and Charge Dump A charge dump feature will quickly discharge the inter- Internal Low Battery Detection connect line when exiting a local alarm. The intercon- Power-up Low Battery Test nect input is also digitally filtered. Interconnect up to 66 Detectors An internal timer allows for a single button, push-to-test RoHS Compliant, Lead Free Packaging to be used for a reduced sensitivity mode. An alarm memory feature allows the user to determine if the unit has previously entered a local alarm condition. Utilizing low-power CMOS technology, the RE46C162/163 devices are designed for use in smoke detectors that comply with Underwriters Laboratory Specification UL217 and UL268. Package Types RE46C162/163 PDIP TSTART 1 16 GUARD2 IO 2 15 DETECT TONE 3 14 GUARD1 TSTROBE VSEN 4 13 5 12 LED OSCAP 6 11 V HS DD 7 10 RBIAS HB 8 9 FEED V SS 2010 Microchip Technology Inc. DS22245A-page 1RE46C162/163 Functional Block Diagram IO (2) TONE (3) Reference FEED (8) Low Battery V (6) DD R2 Comparator + HS (11) 760K - R3 Logic and 340K Timing TSTART (1) HB (10) VSEN (13) + LED (5) - R4 Smoke 1100K Comparator TSTROBE (4) Bias and Power Reset GUARD1 (14) RBIAS (7) DETECT (15) + - GUARD2 (16) OSCAP (12) Oscillator V (9) SS Guard Amp DS22245A-page 2 2010 Microchip Technology Inc.