SMOKE DETECTOR
WITH INTERCONNECT AND TIMER
The A5348CA 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 A5348CA 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
n Interconnect Up to 125 Detectors
n Piezoelectric Horn Driver
n Guard Outputs for Detector Input
n Pulse Testing for Low Battery
n Power-ON Reset
n Internal Reverse Battery Protection
n Internal Timer & Control for Reduced Sensitivity
n Built-In Hysteresis Reduces False Triggering
Always order by complete part number: A5348CA .
Data Sheet
26110.3
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.
1
2
3
4
5
6
7
89
10
11
12
13
14
15
16
LOGIC
OSC. &
TIMING
HORN
DRIVER
GUARD
DETECT. IN
GUARD
SENSITIVITY
SET
OSC. CAP.
HORN
HORN
– SUPPLY
TIMER START
I / O
LOW-V SET
TIMER OUT
LED
+ SUPPLY
TIMING RES.
FEEDBACK
1
V
DD
Dwg. PC-004
2
2
1
V
SS
5348