RE46C166E16F

The RE46C166 devices are low-power, CMOS photoelectric type, smoke detector ICs. With minimal external components, these circuits will provide all the required features for a photoelectric type smoke detector
Each design incorporates a gain selectable photo amplifier for use with an infrared emitter/detector pair
An internal oscillator strobes power to the smoke detection circuitry for 100 µs every 10 seconds to keep standby current to a minimum. If smoke is sensed, the detection rate is increased to verify an alarm condition. A high gain mode is available for push button chamber testing.
A check for a low battery condition and chamber integrity is performed every 43 seconds when in standby. The temporal horn pattern supports the NFPA 72 emergency evacuation signa
An interconnect pin allows multiple detectors to be connected so when one unit alarms, all units will sound. A charge dump feature will quickly discharge the interconnect line when exiting a local alarm. The interconnect input is also digitally filtered.
An internal timer allows for single button, push-to-test 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 RE46C166 was designed for use in smoke detectors that comply with Underwriters Laboratory Specification UL217 and UL268

• Temporal Horn Pattern or Continuous Tone
• Alarm Memory
• Sensitivity Control Times:
      
  • 9 minutes
• I/O Filter and Charge Dump
• Interconnect up to 40 Detectors
• Internal Power-on Reset
• >2000V ESD Protection (HBM) on All Pins
• Low Quiescent Current Consumption (<8 µA)
• Internal Low Battery Detection and Chamber Test
• RoHS Compliant Lead-Free Packaging