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RE46C146

更新时间： 2024-11-20 06:07:27
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美国微芯 - MICROCHIP 光电
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13页 226K
描述
CMOS Photoelectric Smoke Detector ASIC with Intelligent Interconnect and Timer Mode

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R&E International  
A Subsidiary of Microchip Technology Inc.  
RE46C146  
CMOS Photoelectric Smoke Detector ASIC with Intelligent Interconnect and Timer Mode  
Product Specification  
•
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•
•
•
•
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Internal Power On Reset  
General Description  
Low Quiescent Current Consumption  
Available in 16L PDIP or 16L N SOIC  
ESD Protection on all Pins  
Interconnect up to 40 Detectors  
10 Minute Timer for Sensitivity Control  
Temporal Horn Pattern for Smoke and CO  
Internal Low Battery and Chamber Test  
Compatible with Allegro A5366  
Alternate Diagnostic Mode  
The RE46C146 is low power CMOS photoelectric type  
smoke detector IC. With minimal external components  
this circuit will provide all the required features for a  
photoelectric type smoke detector.  
The design incorporates a gain selectable photo  
amplifier for use with an infrared emitter/detector pair.  
An internal oscillator strobes power to the smoke  
detection circuitry for 100us every 10 seconds to keep  
standby current to a minimum. If smoke is sensed the  
detection rate is increased to verify an alarm condition.  
A high gain mode is available for push button chamber  
testing.  
Available in Standard Packaging or RoHS  
Compliant Pb Free Packaging  
Pin Configuration  
In the diagnostic mode the photo amplifier output is  
available on pin 15 for production calibration of the  
photo chamber.  
TEST  
VSEN  
VSS  
C1  
C2  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
DETECT  
STROBE  
A check for a low battery condition and chamber  
integrity is performed every 43 seconds when in  
standby. The temporal horn pattern for a smoke alarm  
condition supports the NFPA 72 emergency evacuation  
signal.  
ROSC  
COSC  
LED  
VDD  
IRED  
IO  
An interconnect pin allows multiple detectors to be  
connected such that when one units alarms, all units  
will sound. The interconnect is compatible with certain  
types of CO interconnect signaling and when  
recognized will sound the temporal pattern for a carbon  
monoxide alarm.  
FEED  
HORNS  
HORNB  
Utilizing low power CMOS technology the RE46C146  
was designed for use in smoke detectors that comply  
with Underwriters Laboratory Specification UL217 and  
UL268.  
An internal 10 minute timer can be used for a reduced  
sensitivity mode.  
Features  
ABSOLUTE MAXIMUM RATINGS  
PARAMETER  
Supply Voltage  
Input Voltage Range Except FEED, IO  
FEED Input Voltage Range  
IO Input Voltage Range  
Input Current except FEED  
Operating Temperature  
SYMBOL  
VDD  
Vin  
VALUE  
12.5  
-.3 to Vdd +.3  
-10 to +22  
-.3 to 17  
10  
-25 to 75  
-55 to 125  
150  
UNITS  
V
V
V
V
mA  
°C  
°C  
°C  
Vinfd  
Vio1  
Iin  
TA  
TSTG  
TJ  
Storage Temperature  
Maximum Junction Temperature  
© 2009 Microchip Technology Inc.  
DS22176A-page 1  
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