Low Voltage Photoelectric Smoke Detector ASIC
Description
BL5980
Low Voltage Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode
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INTRODUCTION
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1 Features
Low Quiescent Current Consumption Two AA Battery Operation Internal Power On Reset Local Alarm Memory Internal Low Battery detector Interconnect up to 40 Detectors 9 minute Timer for Sensitivity Control Temporal or Continuous Horn Pattern Low Battery and Chamber Test Internal Infrared Emitter Diode (IRED) driver Adjustable IRED Drive current Adjustable Hush Sensitivity Available in SOP16
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2 Pin Diagrams
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BL5980
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3 Description
The BL5980 is a low power, low voltage photoelectric type smoke detector IC.
With minimal external components, this circuit will provide all the required features for a photoelectric-type smoke detector.
A check for a low battery condition is performed every 86 seconds, and chamber integrity is tested once every 43 seconds, when in Standby.
The temporal horn pattern supports the NFPA 72 emergency evacuation signal.
The BL5980 incorporates a gain-selectable photo amplifier for use with an infrared emitter/detector pair.
An internal oscillator strobes power to the smoke detection circuitry every 10 seconds, to keep the 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.
An internal 9 minute timer can be used for a Reduced Sensitivity mode.
An interconnect pin allows multiple detectors to be connected such that, when one unit alarms, all units will sound.
the BL5980 was designed for use in smoke detectors that comply with Underwriters Laboratory Specification UL217 and UL268.
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4 Ordering Information
Order Number BL5980
Package Type SOP-16
Marking
BL5980 XXXXX
Packing
Reel Tape Tube
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5 Typical Application Circuit
BL5980
VSS VSS
VSS
3V AA Battery
C1 vss 10uF
L1 10uH
D1
C4 4.
7uF
LX(16)
VBST(15)
R1 C2 100 1uF
VDD(3) Power for lo...
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