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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(shí)器 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 83K |
| 代理商： | A5349CA |
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
5349
AC SMOKE DETECTOR
with INTERCONNECT
and TIMER
LED Output ON Current
5
V
DD
= 7.2 V, V
OUT
= 1.0 V
10
—
—
mA
LED Output ON Time
5
Local Alarm
constant OFF
—
Timer Mode, No Alarm
—
8.35
—
s
LED Output OFF Time
5
No Alarm, In Standby
constant ON
—
No Alarm, Timer Mode After Pin 1
High-to-Low
—
1.67
—
s
I/O Current
2
No Alarm, V
I/O
= V
DD
– 2.0 V
25
—
60
μ
A
Alarm, V
I/O
= V
DD
– 2.0 V
-7.5
—
—
mA
I/O Alarm Voltage
2
External “Alarm” In
3.0
—
—
V
I/O Delay
2
“Alarm” Out
—
3.0
—
s
Supply Current
6
V
DD
= 9.0 V, No Alarm, No Loads
—
5.0
9.0
μ
A
V
DD
= 12 V, No Alarm, No Loads
—
—
12
μ
A
Limits
Characteristic
Pin
Test Conditions
Min.
Typ.
Max.
Units
Test
ELECTRICAL CHARACTERISTICS continued
NOTE 1: Negative current is defined as coming out of (sourcing) the specified device pin.
NOTE 2: Alarm (Smoke) Condition is defined as V
15
< V
13
; No Alarm (No Smoke) Condition as V
15
> V
13
.
CIRCUIT DESCRIPTION
The A5349CA is a low-current CMOS circuit providing all of the
required features for an ionization-type smoke detector.
Oscillator.
An internal oscillator operates with a period of 1.67
seconds during no-smoke conditions. Every 1.67 seconds, internal
power is applied to the entire circuit and a check is made for smoke.
Every 24 clock cycles (40 seconds), a check is made for low supply by
comparing V
DD
to an internal reference. Since very-low currents are
used in the device, the oscillator capacitor at pin 12
should be a low-
leakage type (PTFE, polystyrene, or polypropylene).
Detector Circuitry.
When smoke is detected, the resistor divider
network that sets the sensitivity (smoke trip point) is altered to in-
crease the sensitivity set voltage (pin 13) by typically 130 mV with no
external connections to pins 3 or 13. This provides hysteresis and
reduces false triggering. An active guard is provided on both pins
adjacent to the detector input (pin 15). The voltage at pins 14 and 16
will be within 100 mV of the input. This will keep surface leakage
currents to a minimum and provide a method of measuring the input
voltage without loading the ionization chamber. The active-guard
amplifier is not power strobed and thus provides constant protection
from surface leakage currents. The detector input has internal diode
protection against static damage.
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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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