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RE46C122 Schematic ( Datenblatt PDF ) - Microchip

Teilenummer RE46C122
Beschreibung CMOS Ionization Smoke Detector ASIC
Hersteller Microchip
Logo Microchip Logo 

Gesamt 10 Seiten
		
RE46C122 Datasheet, Funktion
R&E International
A Subsidiary of Microchip Technology Inc.
RE46C122
CMOS Ionization Smoke Detector ASIC with Interconnect and Timer Mode
Product Specification
General Description
The RE46C122 is low power CMOS ionization type
smoke detector IC. With few external components this
circuit will provide all the required features for an
ionization type smoke detector.
An internal oscillator strobes power to the smoke
detection circuitry for 10.5mS every 1.66 seconds to
keep standby current to a minimum. A check for a low
battery condition is performed every 40 seconds when
in standby. The temporal horn pattern supports the
NFPA 72 emergency evacuation signal.
An interconnect pin allows multiple detectors to be
connected such that when one units alarms all units will
sound.
An internal 10 minute timer allows for a separate button
to be used for reduced sensitivity mode.
Although this device was designed for smoke detection
utilizing an ionization chamber it could be used in a
variety of security applications.
The RE46C122 is recognized by Underwriters
Laboratories for use in smoke detectors that comply
with specification UL217 and UL268.
Features
>1500V ESD Protection (HBM) on all Pins
Guard Outputs for Ion Detector Input
+/-0.75pA Detect Input Current
Internal Reverse Battery Protection
Low Quiescent Current Consumption (<6.5uA)
Available in 16L PDIP or 16L N SOIC
Internal Low Battery Detection
Power Up Low Battery Test
Interconnect up to 40 Detectors
10 Minute Timer for Sensitivity Control
Compatible with Allegro A5367
UL Recognized per File S24036
Available in Standard Packaging or RoHS
Compliant Pb Free Packaging.
Pin Configuration
TSTART
IO
LBADJ
TSTROBE
LED
VDD
RBIAS
FEED
1
2
3
4
5
6
7
8
16 GUARD2
15 DETECT
14 GUARD1
13 VSEN
12 OSCAP
11 HS
10 HB
9 VSS
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Input Voltage Range Except FEED, IO
FEED Input Voltage Range
IO Input Voltage Range
Reverse Battery Time
Input Current except FEED
Operating Temperature
Storage Temperature
Maximum Junction Temperature
SYMBOL
VDD
Vin
Vinfd
Vio1
TRB
Iin
TA
TSTG
TJ
VALUE
15
-.3 to Vdd +.3
-10 to +22
-.3 to 17
5
10
-10 to 60
-55 to 125
150
UNITS
V
V
V
V
S
mA
°C
°C
°C
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress
ratings only and operation at these conditions for extended periods may affect device reliability.
This product utilizes CMOS technology with static protection; however proper ESD prevention procedures should be used when
handling this product. Damage can occur when exposed to extremely high static electrical charge.
© 2009 Microchip Technology Inc.
DS22173B-page 1






RE46C122 Datasheet, Funktion
RE46C122
CMOS Ionization Smoke Detector ASIC with
Interconnect and Timer Mode
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
Typical Application
Notes:
Figure 2
Select R9 to reduce sensitivity during the timer mode.
R3, R4 and C1 are typical values and may be adjusted to maximize sound pressure.
C2 should be located as close as possible to the device power pins.
Route the pin 8 PC board trace away from pin 7 to avoid coupling.
© 2009 Microchip Technology Inc.
DS22173B-page 6

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