A5338 데이터 시트보기 (PDF) - Allegro MicroSystems
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A5338 Datasheet PDF : 8 Pages
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Package A, 16-lead DIP
A5338
Smoke Detector
with Interconnect and Timer
Approximate Scale 1:1
Features
Interconnect up to 125 detectors
Piezoelectric horn driver
Guard outputs for detector input
Pulse testing for low battery
Power-on reset
Internal reverse battery protection
Internal timer and control for reduced sensitivity
Built-in hysteresis reduces false triggering
The A5338CA is a low-current, CMOS circuit
providing all of the required features for an ionization-
type smoke detector. A networking capability allows
as many as 125 units to be interconnected so that if
any unit senses smoke, all units will sound an alarm.
In addition, special features are incorporated to facili-
tate alignment and test of the finished smoke detector.
This device is designed to comply with Underwriters
Laboratories Specification UL217.
The internal oscillator and timing circuitry keeps
standby power to a minimum by powering down the
device for 1.66 seconds and sensing smoke for only
10 ms. Every 24 on/off cycles, a check is made for
low battery condition. By substituting other types of
sensors, or a switch for the ionization detector, this
very-low power device can be used in numerous other
battery-operated safety/security applications.
The A5338CA is supplied in a low-cost, 16-pin
dual in-line plastic package. It is rated for continuous
operation over the temperature range of 0°C to +50°C.
Typical Application
9V
50 kΩ
200 kΩ
Push to set
200 kΩ
To other units
+SUPPLY or
–SUPPLY
200 Ω
RLV
1
TIMER START
16
GUARD2
2
I/O
3
LOW-V SET
DETECT IN 15
A5338
GUARD1 14
4 TIMER OUT SENSIVITIVTY SET 13
5
LED
330 Ω
6
+SUPPLY
RT
8.2 MΩ 7 TIMING RES
OSC CAP 12
HORN2 11
HORN1 10
1 μF
8
FEEDBACK
–SUPPLY 9
Smoke
Chamber
Push to test
COSC
0.1 μF
RS
+SUPPLY or
–SUPPLY
Horn
1 MΩ
200 kΩ
0.001 μF
26110.1
RST
Dwg. EC-005A
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