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參數(shù)資料
| 型號： | A5349CA |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | AC SMOKE DETECTOR WITH INTERCONNECT AND TIMER |
| 中文描述： | 煙霧探測器交流與互連和定時器 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 83K |
| 代理商： | A5349CA |
TIMER
MODE
TO
OTHER
UNITS
NOTE
1
NOTE
3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
LOGIC
OSC. &
TIMING
HORN
DRIVER
V
DD
Dwg. EC-005-1A
V
SS
NOTE 2
200 k
5
2
200
8.2 M
1
μ
F
0.1
μ
F
1
2
PUSH
TO
TEST
0.001
μ
F
330
+ SUPPLY
Alarm Circuitry.
If smoke is detected, the
oscillator period changes to 40 ms and the
horn is enabled. The horn output is typically
160 ms ON, 80 ms OFF. During the OFF
time, smoke is again checked and will inhibit
further alarm output if smoke is not sensed.
During smoke conditions the low-supply
alarm is inhibited.
LED.
The LED is continuously ON during the
standby mode indicating the unit is receiving
power. During a remote alarm condition the
LED remains ON. The LED is OFF during a
local alarm condition.
Sensitivity Adjust.
The detector sensitivity
to smoke is set internally by a voltage divider
connected between V
DD
and V
SS
. The
sensitivity can be externally adjusted to the
individual characteristics of the ionization
chamber by connecting a resistor between
pin 13 and V
DD
, or between pin 13 and V
SS
.
Low Supply.
The low supply threshold is set
internally by a voltage divider connected
between V
DD
and V
SS
. The threshold can be
increased by connecting a resistor between
pin 3 and V
DD
. The threshold can be de-
creased by connecting a resistor between pin
3 and V
SS
. The supply voltage level is
checked every 40 seconds.
Timer.
An internal timer is provided that can
be used in various configurations to allow for
a period of reduced smoke detector sensitiv-
ity (“hush”). When a high-to-low transition
occurs at pin 1, the internal timer is reset, the
timer mode enabled, and the circuit reset to a
no-alarm condition (the LED will flash at a 10
second rate). If the level of smoke is in-
creased such that the reduced sensitivity
level is reached, the device will go into the
alarm condition. The timer, however, will
continue to completion of the nominal 10-1/4
minute period (368 clock cycles). If the timer
mode is not used, pin 1 should be tied low.
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
TYPICAL APPLICATION
NOTE 1: Use an external resistor to adjust sensitivity for a particular
smoke chamber.
NOTE 2: Select resistor to reduce sensitivity during timer mode.
NOTE 3: A resistor to ground or V
DD
may be added to this pin to modify low battery
voltage threshold.
NOTE 4: Reverse supply protection must be supplied externally.
sound their associated horns after a nominal 3 second delay. The LED
remains ON when an alarm is signaled from an interconnected unit
and a local smoke condition does not exist.
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 V
DD
and monitoring HORN
1
(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
operation of the comparator circuitry.
5349
AC SMOKE DETECTOR
with INTERCONNECT
and TIMER
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| A5350CA | SMOKE DETECTOR WITH INTERCONNECT |
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| A5358CA | PHOTOELECTRIC SMOKE DETECTOR WITH INTERCONNECT AND TIMER |
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| A53506 | 制造商:n/a 功能描述:Ships in 2 days |
| A5350CA | 功能描述:IC SMOKE DETECTOR ION 16-DIP RoHS:否 類別:集成電路 (IC) >> 接口 - 傳感器和探測器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
| A5350CA-T | 功能描述:IC SMOKE DETECTOR ION 16-DIP RoHS:是 類別:集成電路 (IC) >> 接口 - 傳感器和探測器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
| A5354CA | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:SMOKE DETECTOR WITH INTERCONNECT |
| A5355CA | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:SMOKE DETECTOR WITH INTERCONNECT |
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