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| 型号： | A5350CA |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC SMOKE DETECTOR ION 16-DIP |
| 标准包装： | 25 |
| 类型： | 烟雾探测器 |
| 输入类型： | 离子化 |
| 输出类型： | 电压 |
| 电流 - 电源： | 12µA |
| 安装类型： | 通孔 |
| 封装/外壳： | 16-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 16-DIP |
| 包装： | 管件 |
Ionization Smoke Detector with Interconnect
A5350
5
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
The A5350 is a low-current, BiCMOS circuit providing all of
the required features for an ionization-type smoke detector. The
alarm polarity on DETECT IN is inverted as compared with typi-
cal ion-type devices. The DETECT IN voltage must rise above
the SENSITIVITY SET voltage in order to cause an alarm.
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 for 10 ms and a check is made for
smoke. Every 24 clock cycles (approximately 40 seconds), the
LED pin is pulsed and a check is made for low battery by com-
paring VDD to an internal reference. Because very-low currents
are used in the device, the oscillator capacitor at the OSC CAP
pin should be a low-leakage type (PTFE, polystyrene, or polypro-
pylene).
Detector Circuitry
When the voltage on the DETECT IN pin is greater than the volt-
age on the SENSITIVITY SET pin, the A5350 evaluates this as a
smoke condition.
An active guard is provided on GUARD1 and GUARD2, the two
pins adjacent to the detector input, the DETECT IN pin. VGUARD1
and VGUARD2 will be within 100 mV of VDETECTIN. This will
keep surface leakage currents to a minimum and provide a
method of measuring the input voltage without loading the ion-
ization 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
electrostatic damage.
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 checked and further
alarm output will be inhibited if smoke is not sensed. During a
smoke condition, the low-battery alarm is inhibited and the LED
is pulsed approximately once every second.
Sensitivity Adjust
The detector sensitivity must be externally set to the individual
characteristics of the ionization chamber by connecting the
Circuit Description
Characteristic
Symbol
Test Conditions
Test Pin
Min.
Typ.
Max.
Units
I/O Current
IIOL
No alarm, VI/O = VDD – 2.0 V
2
25
—
60
μA
IIOH
Local alarm, VI/O = VDD – 2.0 V
2
–7.5
—
mA
I/O Alarm Voltage
VIH(IO)
External “alarm” in
2
3.0
—
V
I/O Delay
tr(io)
Local or test alarm to I/O active
2
—
3.0
—
s
1Negative current is dened as coming out of the specied device pin (sourcing).
2Alarm (smoke) condition is dened as VDETECTIN > VSENSITIVITYSET; no alarm (no smoke) condition is dened as VDETECTIN < VSENSITIVITYSET.
ELECTRICAL CHARACTERISTICS1,2
(continued) at TA = 25°C, VDD = 9.0 V, VSS = 0 V, COSCCAP = 0.1 μF,
RTIMINGRES = 8.2 MΩ (unless otherwise noted)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A5350CA-T | 功能描述:IC SMOKE DETECTOR ION 16-DIP RoHS:是 类别:集成电路 (IC) >> 接口 - 传感器和探测器接口 系列:- 其它有关文件:Automotive Product Guide 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:74 系列:- 类型:触控式传感器 输入类型:数字 输出类型:数字 接口:JTAG，串行 电流 - 电源:100µA 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:管件 |
| A5354CA | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:SMOKE DETECTOR WITH INTERCONNECT |
| A5355CA | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:SMOKE DETECTOR WITH INTERCONNECT |
| A5358 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A5358 is a low-current BiCMOS circuit providing all of the required features for a photoelectric type smoke detector. |
| A53585-000 | 制造商:TE Connectivity 功能描述:SINGLE WALL FLUORO - Bulk 制造商:TE Connectivity 功能描述:RW-175-1/4-X-45MM |
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