A5354 데이터 시트보기 (PDF) - Allegro MicroSystems
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A5354 Datasheet PDF : 8 Pages
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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.
9V
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
24 CLOCK CYCLES
LED OFF
SAMPLE
ALARM
NO LOW BATTERY
ALARM AND
LOW BATTERY
NO ALARM
LOW BATTERY
40 ms
24 CLOCK CYCLES
30 CLOCK CYCLES
LED
ON
12 CLOCK CYCLES
6 CLOCK CYCLES
6 CLOCK CYCLES
HORN
OFF
ON
LOW BATTERY
WARNING
SMOKE
CHAMBER
V15 > V13 (NO SMOKE)
V15 < V13 (SMOKE)
Dwg. WC-003
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