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PDF A5354CA Data sheet ( Hoja de datos )
| Número de pieza | A5354CA | |
| Descripción | SMOKE DETECTOR | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de A5354CA (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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5354
NO CONNECT. 1 NC
I/O 2
LOW-V SET 3
NO CONNECT. 4 NC
LED 5
LOGIC
OSC. &
TIMING
16 GUARD 2
15 DETECT. IN
14 GUARD1
13
SENSITIVITY
SET
12 OSC. CAP.
+ SUPPLY 6 V DD
TIMING RES. 7
HORN
DRIVER
FEEDBACK 8
11 HORN 2
10 HORN 1
V SS 9 – SUPPLY
Dwg PC-004-1
SMOKE DETECTOR
WITH INTERCONNECT
The A5354CA 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 A5354CA 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. Similar devices, with an internal timer to allow
for a period of reduced sensitivity (“hush”), are available as the
A5348CA.
ABSOLUTE MAXIMUM RATINGS
(Voltages are referenced to VSS)
Supply Voltage Range,
VDD ................................ -0.5 V to +15 V
Reverse Battery (10.5 V) ....................... 20 s
Input Voltage Range,
VIN ........................ -0.3 V to VDD + 0.3 V
Input Current, IIN ............................... 10 mA
Operating Temperature Range,
TA ..................................... 0°C to +50°C
Storage Temperature Range,
TS ............................... -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
s Built-In Hysteresis Reduces False Triggering
Always order by complete part number: A5354CA .
1 page  
5354
SMOKE DETECTOR
with INTERCONNECT
TYPICAL APPLICATION
I/O. A connection is provided at pin 2 to
allow multiple smoke detectors to be
commoned. If any single unit detects smoke
(I/O is driven high), all connected units will
sound their associated horns after a nominal
3 second delay. The LED is suppressed
when an alarm is signaled from an intercon-
nected unit.
Testing. On power up, all internal counters
are reset. Internal test circuitry allows for low
battery check by holding pins 8 and 12 low
during power up, then reducing VDD and
monitoring HORN1 (pin 10). All functional
tests can be accelerated by driving pin 12
with a 2 kHz square wave. The 10 ms strobe
period must be maintained for proper opera-
tion of the comparator circuitry.
9 V 200 kΩ
200 Ω
TO
OTHER
UNITS
NOTE
2
1 NC
2
3
4 NC
330 Ω
5
LOGIC
OSC. &
TIMING
8.2 MΩ
6 V DD
7
HORN
DRIVER
1 µF
8
16
15
14
13
12
11
10
V SS 9
0.1 µF
PUSH
TO
TEST
NOTE
1
0.001 µF
Dwg. EC-005-4
NOTE 1: An external resistor divider is used to adjust sensitivity for the
particular smoke chamber.
NOTE 2: A resistor to ground or VDD may be added to this pin to modify
low battery voltage threshold.
TIMING DIAGRAMS IN TYPICAL APPLICATION
V12
OSC. CAP
INTERNAL
CLOCK
LED
SMOKE
COMPARATOR
HORN
NO ALARM
NO LOW BATTERY
STANDBY MODE
1.67 s
10 ms
ALARM
NO LOW BATTERY
40 ms
ALARM AND
LOW BATTERY
NO ALARM
LOW BATTERY
24 CLOCK CYCLES
LED OFF
SAMPLE
24 CLOCK CYCLES
30 CLOCK CYCLES
LED
ON
12 CLOCK CYCLES
6 CLOCK CYCLES
6 CLOCK CYCLES
HORN
ON
OFF
LOW BATTERY
WARNING
SMOKE
CHAMBER
V15 > V13 (NO SMOKE)
V15 < V13 (SMOKE)
Dwg. WC-003
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet A5354CA.PDF ] | |
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