a5366 Allegro MicroSystems, Inc., a5366 Datasheet

a5366

Manufacturer Part Number

a5366

Description

Photoelectric Smoke Detector With Interconnect And Timer

Manufacturer

Allegro MicroSystems, Inc.

Datasheet

1.A5366.pdf (13 pages)

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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 applications, per file #S2113

Packages:

Not to scale

26110.11-DS, Rev. E

(Package A)

16-pin DIP

Rx1

Rx2

8.2 kΩ

4.7 kΩ

1 kΩ

5 kΩ

100 μF

Smoke

Chamber

other units

To / from

4700 pF

200 kΩ

16-pin SOICW

(Package LW)

0.047 μF

220 Ω

560 Ω

22 Ω

Typical Application Diagram

DETECT

STROBE

VDD

IRED

HORN1

I/O

A5366

TIMING RES

Photoelectric Smoke Detector

FEEDBACK

OSC CAP

with Interconnect and Timer

HORN2

HUSH

TEST

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.

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.

VSS

LED

100 kΩ

1.5 MΩ

Push-to-Test

1500 pF

1000 pF

220 kΩ

Red LED

22 μF

Piezo Horn

10 MΩ

330 Ω

9 V

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

A5366

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