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A5303

更新时间： 2024-09-17 06:35:15
品牌 Logo 应用领域
急速微 - ALLEGRO 光电
页数 文件大小 规格书
14页 373K
描述
Photoelectric Smoke Detector with Interconnect, Timer, and Latching Alarm Indicator

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A5303 数据手册

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A5303  
Photoelectric Smoke Detector  
with Interconnect, Timer, and Latching Alarm Indicator  
Features and Benefits  
Description  
▪ Low average standby current allows 10-year battery life  
▪ 2.3 to 5.5 V operating range  
The A5303 is a low-current BiCMOS photoelectric smoke  
detector circuit with ultra-low standby current and can operate  
for 10 years powered by inexpensive batteries. This device can  
beusedwithaninfraredopticalchambertosenselightscattered  
from smoke particles. A networking capability allows units to  
be interconnected so that if any unit senses smoke all units will  
sound an alarm. Special features are incorporated in the design  
to facilitate calibration and testing of the finished detector.  
▪ Interconnect option  
▪ Logic outputs to control an external sound IC  
▪ Low battery detection and warning  
▪ Chamber sensitivity test and warning  
▪ Triple horn-chirp to distinguish chamber warning  
▪ Power-on reset (POR)  
▪ Digital filter on I/O provides significant noise immunity  
▪ Timer (hush) mode for enabling reduced sensitivity period  
▪ Built-in circuits to reduce false triggering  
▪ ESD protection circuitry on all pins  
▪ Temporal Horn Pattern, per UL217, NFPA72, ISO8201  
▪ Latching alarm indicator identifies alarm-initiating devices  
A variable-gain photoamplifier can be directly interfaced to  
an infrared emitter-detector pair. The amplifier gain levels  
are determined by two external capacitors and are internally  
selecteddependingontheoperatingmode.Lowgainisselected  
duringstandbyandtimermodes. Duringalocalalarm, thislow  
gainisincreased(internally)byapproximately45%toprovide  
hysteresis. High gain is used during pushbutton test and to  
periodically monitor the chamber sensitivity during standby.  
The internal oscillator and timing circuitry minimize standby  
power by sensing for smoke for only 100 μs once every 10 s.  
Aspecial three-stage-speedup sensing scheme is incorporated  
to minimize the time to an audible alarm and also to reduce  
falsetriggering. Chambersensitivityisperiodicallymonitored  
andtwoconsecutivecyclesofdegradedsensitivityarerequired  
for a warning signal to occur.  
Package: 20-pin TSSOP (suffix LE)  
The A5303 is supplied in a thin profile (<1.2 mm overall  
height) 20-pin TSSOPpackage (0.65 mm nominal lead pitch).  
The package is lead (Pb) free with 100% matte tin leadframe  
plating.  
Not to scale  
Typical Application Diagram  
To / from  
other units  
220 Ω  
VDD  
3 V  
VDD  
VDD  
1.2 V  
56 nF  
VDD  
C1  
C2  
10 μF  
Gain  
LVSET  
A
B
3 kΩ  
5 k Ω  
5.6 nF  
560 Ω  
R1  
R2  
Select  
Low Batt  
Low Batt  
Sample  
Push-to-test  
200 kΩ  
TEST  
A resistor connected  
between this pin and  
VDD or VSS adjusts  
the low-battery threshold  
DETECT  
STROBE  
BLINK  
A
B
SOUT0  
SOUT1  
SOUT2  
Smoke  
Chamber  
Control  
Logic  
VDD  
1.6 V  
-
Voice IC outputs  
In standby, BLINK = VDD  
causes LED to blink,  
causes  
BLINK = VSS  
LED not to blink  
1 kΩ  
Output to optional  
boost converter to  
drive a piezo horn  
VDD  
IRED  
ISET  
HORN  
LED  
100 μF  
3 Ω  
Red LED  
HUSH  
VSS  
OSCCAP  
TRES  
OSC  
Timing  
Connect HUSH to  
VSS to disable  
timer mode  
1500 pf  
100 kΩ  
10 ΜΩ  
5303-DS  
1234567...14

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