A5350 Datasheet PDF - Allegro

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A5350
Allegro

Part Number A5350
Description Ionization Smoke Detector
Page 9 Pages


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A5350
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
Inverted alarm polarity on DETECT IN
Package: 16-pin DIP (suffix A):
Not to scale
Description
The A5350 is a low-current, BiCMOS 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 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 A5350 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 –10°C to 60°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
16
GUARD2
2
I/O
15
DETECT IN
3 A5350
LOW-V SET
14
GUARD1
4 NC
330 Ω 5 LED
SENSITIVITY SET 13
12
OSC CAP
9V
6 VDD
11
HORN2
8.2 MΩ 7 TIMING RES
HORN1 10
1 μF 8 FEEDBACK
9
VSS
200 k Ω
Push
to Test
200 k Ω
4.7 MΩ
A
0.1 μF
4.7 MΩ
A Use an external resistor divider to set
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
26110.5 Rev. 5

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