RE46C180E16F Microchip

RE46C180 CMOS Programmable Ionization Smoke Detector ASIC with Interconnect, Timer Mode and Alarm Memory Features Description 6V to 12V Operation The RE46C180 is a next generation low-power, CMOS ionization-type, smoke detector IC. With minimal exter- Low-Quiescent Current Consumption nal components, this circuit will provide all the required Programmable Standby Sensitivity features for an ionization-type smoke detector. Programmable HUSH Sensitivity An on-chip oscillator strobes power to the smoke Programmable Hysteresis detection circuitry for 5 ms every 10 seconds to keep Programmable Chamber Voltage for Push-to-Test the standby current to a minimum. (PTT) and Chamber Test A check for a Low Battery condition is performed every Programmable 150 mV Low Battery Set Point 80s and an ionization chamber test is performed once Internal Ionization Chamber Test every 320s when in Standby. The temporal horn pattern Internal Low Battery Test complies with the National Fire Protection Association Internal Power-on Reset and Power-up Low NFPA 72 National Fire Alarm and Signaling Code for Battery Test emergency evacuation signals. Alarm Memory An interconnect pin allows multiple detectors to be con- Auto Alarm Locate nected, such that when one unit alarms, all units will sound. A charge dump feature quickly discharges the Horn Synchronization interconnect line when exiting a Local Alarm condition. IO Filter and Charge Dump The interconnect input is also digitally filtered. Smart Interconnect An internal 9 minute or 80s timer can be used for a Interconnect up to 40 Detectors Reduced Sensitivity mode. 5% All Internal Oscillator An alarm memory feature allows the user to determine 9 Minute or 80 Second Timer for Sensitivity whether the unit has previously entered a Local Alarm Control condition. Temporal or Continuous Horn Pattern Utilizing low-power CMOS technology, the RE46C180 Guard Outputs for Ion Detector Input is designed for use in smoke detectors that comply with 0.75 pA Detect Input Current the Standard for Single and Multiple Station Smoke 10-year End-of-Life Indication Alarms, UL217 and the Standard for Smoke Detectors for Fire Alarm Systems, UL268. Package Types RE46C180 PDIP, SOIC TEST 1 16 GUARD2 IO DETECT 2 15 3 14 GLED GUARD1 CHAMBER 4 13 T3 5 12 RLED T2 6 11 V DD HS TESTOUT 7 10 HB FEED 8 9 V SS 2011-2021 Microchip Technology Inc. DS20002275C-page 1RE46C180 Functional Block Diagram DS20002275C-page 2 2011-2021 Microchip Technology Inc. IO (2) TEST (1) V (6) DD FEED (8) Low Batt Trimmable Comp Low Batt + Trimmable Reference HS (11) Logic Low Batt and Setting Timing - Smoke Comp Trimmable HB (10) Smoke + Reference RLED (5) - GUARD1 (14) GLED (3) + BIAS, Power Reset DETECT (15) and - TESTOUT (7) Test and Trimmable Oscillator GUARD2 (16) Program T2 (12) Mode Sel Guard T3 (13) Amp V (9) SS Chamber Programmable Voltage Trim CHAMBER (4)