A5364 Datasheet, PDF (1/9 Pages) Allegro MicroSystems – Low average standby current for long battery life

A5364
Ionization Smoke Detector
with Interconnect
Features and Benefits
▪ Low average standby current for long battery life
▪ Interconnect up to 125 detectors
▪ Piezoelectric horn driver
▪ Guard outputs for detector input
▪ Pulse testing for low battery
▪ Power-on reset (POR)
▪ Internal reverse battery protection
▪ Built-in hysteresis reduces false triggering
▪ Temporal horn pattern, per UL217, NFPA72, and ISO8201
▪ UL Recognized for UL217 applications, per file # S2113
Package: 16-pin DIP (suffix A)
Not to scale
Description
The A5364 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 their alarm. In addition, special features are incorporated
to facilitate alignment and test of the finished smoke detector.
The device is Recognized by Underwriters Laboratories for use
in smoke alarms that comply with Standard UL217.
The internal oscillator and timing circuitry keep standby power
to a minimum by powering down the device for 1.66 seconds
and sensing for smoke for only 10 ms. Every 24 on-off cycles,
a check is made for a 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 A5364 is supplied in a low-cost 16-pin dual in-line plastic
package (DIP). It is rated for continuous operation over the
temperature range of 0°C to 50°C. The Pb (lead) free version
(suffix –T) has 100% matte tin leadframe plating.
Typical Application
To / from
other units
200 Ω
B
1 NC
200 kΩ
16
GUARD2
2
15
I/O
DETECT IN
A5364
3
14
LOW-V SET
GUARD1
4 NC
330 Ω ₅
LED
13
SENSITIVITY SET
12
OSC CAP
9V
6
11
VDD
HORN2
8.2 MΩ _{7 TIMING RES}
10
HORN1
1 μF
8
FEEDBACK
9
VSS
200 k Ω
Push
to Test
A
0.1 μF
A Use an external resistor to adjust
sensitivity for a particular smoke chamber.
B ^{A resistor to VSS or VDD may}
be added to this pin to modify
low battery voltage threshold.
C Value of component will vary, based on
the piezoelectric horn used.
1.5 MΩ
C
220 kΩ
C
0.001 μF
C
26110.7E