Smoke detector IC 's designed for photoelectric Chambers dojo.provide all the functions provides necessary to sense and respond to Smoke in the air when combined with a Smoke detection chamber. 2 in both residential and ltd. proceeds Allegro' s Smoke detection IC 's dojo.provide a wide variety of the features o 10 year' life, alarm, networking, and temporal as well as repetitive alarm modes.
TheA5303Is a low current photoelectric smoke detector circuit with ultra - low standby current and can operate for 10 years powered by inexpensive batteries. TheA5366 and A5358Are a low current sensing IC 's that dojo.provide all of the required features for a photoelectric type smoke detector. These devices can be 2 with an infrared photoelectric chamber to sense scattered light from smoke particles.
A variable - gain photoamplifier can be directly interfaced to an infrared emitter - detector pair. The internal oscillator and timing circuitry minimize standby power by sensing The for smoke for only 100 (including s once every 10 s. A special three - stage - speedup sensing scheme is incorporated (nasdaq: PCLN - news) to minimize The time to The an audible alarm and also to reduce false triggering. The Chamber sensitivity is periodically monitored, and two consecutive cycles of degraded sensitivity are required for A warning signal to occur.
Special features are incorporated (nasdaq: PCLN - news) in these designs to facilitate networking of detectors and calibration and testing of the finished detector. The device is recognized by Underwriters Laboratories for use in smoke alarms that comply with Standard UL217, or UL268, per file # S2113.
TheA5303Is supplied in a thin profile (< 1.2 mm overall height) 20 - pin TSSOP package (LE) (0.65 mm nominal lead pitch) and a 20 - contact QFN package (ES) with the exposed thermal pad. Both packages are lead (Pb) free with 100% matte enrolled tin leadframe plating.
TheA5366 and A5358Are supplied in a 16 - pin dual - line in plastic package suffix (a), and for surface mount, a 16 - pin SOICW suffix (LW). The lead (Pb) free versions (suffix - T) have 100% matte enrolled - tin leadframe plating.
