A5364 데이터 시트보기 (PDF) - Allegro MicroSystems
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A5364 Datasheet PDF : 8 Pages
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5364
SMOKE DETECTOR
WITH INTERCONNECT
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 interconnected
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.
TYPICAL APPLICATION
9V
200 kΩ
1 NC
200 Ω
2
TO
OTHER
UNITS
NOTE
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: Use an external resistor to adjust sensitivity for a particular smoke
chamber.
NOTE 2: A resistor to ground or V may be added to this pin to modify low
DD
battery voltage threshold.
V12
OSC. CAP
NO ALARM
NO LOW BATTERY
STANDBY MODE
1.67 s
10 ms
INTERNAL
CLOCK
24 CLOCK CYCLES
LED
SMOKE
COMPARATOR
LED OFF
LED
ON
SAMPLE
HORN
TIMING DIAGRAM IN TYPICAL APPLICATION
ALARM
NO LOW BATTERY
ALARM AND
LOW BATTERY
NO ALARM
LOW BATTERY
40 ms
19 CLOCK CYCLES
13 CLOCK
CYCLES
12 CLOCK 12 CLOCK
CYCLES
CYCLES
HORN
ON TIME
"A"
HORN
OFF TIME
"B"
24 CLOCK CYCLES
24 CLOCK CYCLES
36 CLOCK CYCLES
HORN OFF TIME
"C"
30 CLOCK CYCLES
LOW BATTERY
WARNING
SMOKE
CHAMBER
I/O
V15 > V13 (NO SMOKE)
V15 < V13 (SMOKE)
SHADED AND UNSHADED AREAS
ARE DIFFERENT TIME SCALES
73 CLOCK CYCLES
Dwg. WC-003-3
www.allegromicro.com
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