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Allegro - Photoelectric Smoke Detector

Numéro de référence A5366
Description Photoelectric Smoke Detector
Fabricant Allegro 
Logo Allegro 





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A5366 fiche technique
A5366
Photoelectric Smoke Detector
with Interconnect and Timer
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
Packages:
16-pin DIP
(Package A)
16-pin SOICW
(Package LW)
Not to scale
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
determined by two external capacitors and are internally selected
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.
A special 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.
Typical Application Diagram
Rx1
A Rx2
26110.11-DS, Rev. G
VDD
8.2 kΩ
5 kΩ
4.7 kΩ
0.047 μF
560 Ω
4700 pF
200 kΩ
1 kΩ
Smoke
Chamber
100 μF
22 Ω
To / from
other units
220 Ω
1 C1
2 C2
A5366
3
4
DETECT
STROBE
5 VDD
TEST 16
HUSH 15
VSS 14
Push-to-Test
9V
22 μF
B Red LED
1500 pF
TIMING RES 13
100 kΩ
10 MΩ
6 IRED
OSC CAP 12
330 Ω
7 I/O
8 HORN1
LED 11
FEEDBACK 10
HORN2 9
220 kΩ C
1000 pF
C Piezo Horn
1.5 MΩ C
A Connect to allow timer mode
("hush") operation
B Connect HUSH to VSS
to disable timer mode
C Value of component can vary,
based on the piezoelectric horn used

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