5355 Datasheet, PDF (1/8 Pages) Allegro MicroSystems – SMOKE DETECTOR WITH INTERCONNECT

5355
NO CONNECT. 1 NC
I/O 2
LOW-V SET 3
LOGIC
NO CONNECT. 4 NC
LED 5
OSC. &
TIMING
+ SUPPLY 6 V _DD
TIMING RES. 7
HORN
DRIVER
FEEDBACK 8
16 GUARD ₂
15 DETECT. IN
14 GUARD1
13
SENSITIVITY
SET
12 OSC. CAP.
11 HORN ₂
10 HORN ₁
V _SS 9 – SUPPLY
Dwg. PC-004-1
SMOKE DETECTOR
WITH INTERCONNECT
The A5355CA 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 battery-operated safety/security applications.
The A5355CA 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.
ABSOLUTE MAXIMUM RATINGS
(Voltages are referenced to V_SS)
Supply Voltage Range,
V_DD ................................ -0.5 V to +15 V
Reverse Battery (10.5 V) ....................... 20 s
Input Voltage Range,
V_IN ........................ -0.3 V to V_DD + 0.3 V
Input Current, I_IN ............................... 10 mA
Operating Temperature Range,
T_A ..................................... 0°C to +50°C
Storage Temperature Range,
T_S ............................... -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.
FEATURES
s Interconnect Up to 125 Detectors
s Piezoelectric Horn Driver
s Guard Outputs for Detector Input
s Pulse Testing for Low Battery
s Power-ON Reset
s Internal Reverse Battery Protection
Always order by complete part number: A5355CA .