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A5366 Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A5366 Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 13 page Description The A5366 is a low-current BiCMOS circuit providing all of the required features for a photoelectric type smoke detector. This device can be used with an infrared photoelectric chamber to sense scattered light from smoke particles. A networking capability allows as many as 50 units to be interconnected so that if any unit senses smoke all units will sound an alarm. Special features are incorporated in the design to facilitate 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. A variable-gain photoamplifier can be directly interfaced to an infrared emitter-detector pair. The amplifier gain levels are determinedbytwoexternalcapacitorsandareinternallyselected depending on the operating mode. Low gain is selected during standby and timer modes. During a local alarm, this low gain is increased (internally) by approximately 10% to reduce false triggering. High gain is used during pushbutton test and to periodically monitor the chamber sensitivity during standby. The internal oscillator and timing circuitry keep standby power to a minimum by sensing for smoke for only 100 μs every 10 s. Aspecial three-stage–speedup sensing scheme is incorporated to minimize the time to an audible alarm and also to reduce false triggering. Chamber sensitivity is periodically monitored and two consecutive cycles of degraded sensitivity are required for a warning signal (chirp) to occur. The A5366 is supplied in a 16-pin dual in-line plastic package (suffix A), and for surface mount, a 16-pin SOICW (suffix LW). The lead (Pb) free versions (suffix –T) have 100% matte- tin leadframe plating. The devices are rated for continuous operation over the temperature range of –25°C to 75°C. 26110.11-DS, Rev. G Features and Benefits ▪ Low average standby current for long battery life ▪ Interconnect up to 50 detectors ▪ Piezoelectric horn driver ▪ Low battery detection (all internal) ▪ Chamber sensitivity test and alarm ▪ Power-on reset (POR) ▪ Internal timer and control for reduced sensitivity mode ▪ Built-in circuits to reduce false triggering ▪ 6 to 12 V operating range ▪ ESD protection circuitry on all pins ▪ Temporal Horn Pattern, per UL217, NFPA72, and ISO8201 ▪ UL Recognized for UL217 or UL268 applications Photoelectric Smoke Detector with Interconnect and Timer Packages: Not to scale A5366 16-pin DIP (Package A) 16-pin SOICW (Package LW) Typical Application Diagram C1 C2 DETECT STROBE VDD IRED HORN1 HORN2 I/O FEEDBACK LED OSC CAP TIMING RES VSS HUSH TEST A5366 To / from other units 220 Ω Rx2 Rx1 100 μF 1 kΩ 4.7 kΩ 5 kΩ 4700 pF 0.047 μF 560 Ω 200 kΩ 220 kΩ 1.5 MΩ 1000 pF 100 kΩ 10 MΩ 330 Ω 1500 pF Red LED Push-to-Test 9 V 22 μF Connect HUSH to VSS to disable timer mode Value of component can vary, based on the piezoelectric horn used Connect to allow timer mode ("hush") operation Piezo Horn 8.2 kΩ VDD 22 Ω Smoke Chamber B C C C C B A A 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 |
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