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What is 5349?

This electronic component, produced by the manufacturer "Allegro MicroSystems", performs the same function as "AC SMOKE DETECTOR WITH INTERCONNECT AND TIMER".


5349 Datasheet PDF - Allegro MicroSystems

Part Number 5349
Description AC SMOKE DETECTOR WITH INTERCONNECT AND TIMER
Manufacturers Allegro MicroSystems 
Logo Allegro MicroSystems Logo 


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5349
AC SMOKE DETECTOR
WITH INTERCONNECT AND TIMER
TIMER START 1
I/O 2
LOGIC
16 GUARD 2
15 DETECT. IN
LOW-V SET 3
TIMER OUT 4
LED 5
OSC. &
TIMING
14 GUARD1
13
SENSITIVITY
SET
12 OSC. CAP.
+ SUPPLY 6 V DD
TIMING RES. 7
FEEDBACK 8
HORN
DRIVER
11 HORN 2
10 HORN1
VSS 9 – SUPPLY
Dwg. PC-004
The A5349CA 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 facilitate 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 safety or security applications.
The A5349CA 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.
FEATURES
s Interconnect Up to 125 Detectors
s Piezoelectric Horn Driver
s Guard Outputs for Detector Input
s Low Supply Detection
s Power-ON Reset
s Internal Timer & Control for Reduced Sensitivity
s Built-In Hysteresis Reduces False Triggering
ABSOLUTE MAXIMUM RATINGS
(Voltages are referenced to VSS)
Supply Voltage Range,
VDD ................................ -0.5 V to +15 V
Input Voltage Range,
VIN ........................ -0.3 V to VDD + 0.3 V
Input Current, IIN ................................ 10 mA
Operating Temperature Range,
TA ..................................... 0°C to +50°C
Storage Temperature Range,
TS ................................ -55°C to +125°C
CAUTION: CMOS devices have input static
protection but are susceptible to damage when
exposed to extremely high static electrical
charges.
Always order by complete part number: A5349CA .

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5349 equivalent
5349
AC SMOKE DETECTOR
with INTERCONNECT
and TIMER
Alarm Circuitry. If smoke is detected, the
oscillator period changes to 40 ms and the
horn is enabled. The horn output is typically
160 ms ON, 80 ms OFF. During the OFF
time, smoke is again checked and will inhibit
further alarm output if smoke is not sensed.
During smoke conditions the low-supply
alarm is inhibited.
LED. The LED is continuously ON during the
standby mode indicating the unit is receiving
power. During a remote alarm condition the
LED remains ON. The LED is OFF during a
local alarm condition.
Sensitivity Adjust. The detector sensitivity
to smoke is set internally by a voltage divider
connected between VDD and VSS. The
sensitivity can be externally adjusted to the
individual characteristics of the ionization
chamber by connecting a resistor between
pin 13 and VDD, or between pin 13 and VSS.
Low Supply. The low supply threshold is set
internally by a voltage divider connected
between VDD and VSS. The threshold can be
increased by connecting a resistor between
pin 3 and VDD. The threshold can be de-
creased by connecting a resistor between pin
3 and VSS. The supply voltage level is
checked every 40 seconds.
Timer. An internal timer is provided that can
be used in various configurations to allow for
a period of reduced smoke detector sensitiv-
ity (“hush”). When a high-to-low transition
occurs at pin 1, the internal timer is reset, the
timer mode enabled, and the circuit reset to a
no-alarm condition (the LED will flash at a 10
second rate). If the level of smoke is in-
creased such that the reduced sensitivity
level is reached, the device will go into the
alarm condition. The timer, however, will
continue to completion of the nominal 10-1/4
minute period (368 clock cycles). If the timer
mode is not used, pin 1 should be tied low.
I/O. A connection is provided at pin 2 to
allow multiple smoke detectors to be
commoned. If any single unit detects smoke
(I/O is driven high), all connected units will
TYPICAL APPLICATION
+ SUPPLY
TIMER
MODE
200 k
TO
OTHER
UNITS
200
1
2
NOTE
3
330
3
4
5
LOGIC
OSC. &
TIMING
16
15
14
13
12
8.2 M
6 V DD
7
HORN
DRIVER
11
10
1 µF
8
VSS 9
0.1 µF
PUSH
TO
TEST
NOTE
1
NOTE 2
0.001 µF
Dwg. EC-005-1A
NOTE 1: Use an external resistor to adjust sensitivity for a particular
smoke chamber.
NOTE 2: Select resistor to reduce sensitivity during timer mode.
NOTE 3: A resistor to ground or VDD may be added to this pin to modify low battery
voltage threshold.
NOTE 4: Reverse supply protection must be supplied externally.
sound their associated horns after a nominal 3 second delay. The LED
remains ON when an alarm is signaled from an interconnected unit
and a local smoke condition does not exist.
Testing. On power up, all internal counters are reset. Internal test
circuitry allows for low-battery check by holding pins 8 and 12 low
during power up, then reducing VDD and monitoring HORN1 (pin 10).
All functional tests can be accelerated by driving pin 12 with a 2 kHz
square wave. The 10 ms strobe period must be maintained for proper
operation of the comparator circuitry.


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