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PDF ( 数据手册 , 数据表 ) A5348

零件编号 A5348
描述 Ionization Smoke Detector
制造商 Allegro
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A5348 数据手册, 描述, 功能
A5348
Ionization Smoke Detector
with Interconnect and Timer
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
Timer (Hush) mode for enabling reduced sensitivity period
Built-in hysteresis reduces false triggering
Package: 16-pin DIP (suffix A):
Description
The A5348 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 A5348 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.
Not to scale
Typical Application
50 kΩ
To / from
other units
9V
Timer
Mode
1
200 Ω 2
C3
4
330 Ω 5
200 kΩ
TIMER START
GUARD2
I/O DETECT IN
A5348
LOW-V SET
GUARD1
TIMER OUT
SENSITIVITY SET
LED OSC CAP
16
15
14
13
12
8.2 MΩ
6 VDD
7 TIMING RES
11
HORN2
10
HORN1
1 μF 8 FEEDBACK
9
VSS
B
200 k Ω
Push
to Test
A
0.1 μF
A Use an external resistor to adjust
sensitivity for a particular smoke chamber.
B Select resistor to reduce sensitivity
during Timer mode.
C A resistor to VSS or VDD may
be added to this pin to modify
low battery voltage threshold.
D Value of component will vary, based on
the piezoelectric horn used.
1.5 MΩ
D
220 kΩ
D
0.001 μF
D
26110.3 Rev. 4







A5348 pdf, 数据表
A5348
Ionization Smoke Detector
with Interconnect and Timer
Local Smoke Detection/Test Alarm Condition
Test event
tosc( al arm)
OSC CAP Pin
Internal Clock
Smoke Sample
LED Pin
tw(osc)
Smoke Sample
Smoke Chamber
LED Pin
Horn Enable
I/O Pin
6 clock cycles
VDETECTIN < V SENSITIVITYSET (smoke)
tled3
LED on
ton( horn)
toff(horn)
tw(led)
tr (i o)
(Output)
(no smoke )
LED off (high-Z)
Remote Alarm Condition
tosc( al arm)
OSC CAP Pin
Internal Clock
I/O Pin
LED Pin
Horn Enable
ton( horn)
tw( osc)
toff(horn)
I/O Pin
(Input)
LED off (high-Z)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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