R&E International
RE46C146
CMOS Photoelectric Smoke Detector ASIC with Intelligent Interconnect and Timer Mode
Preliminary Product Specification
Features
General Description
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Internal Power On Reset
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.
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
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.
Alternate Diagnostic Mode
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.
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
Telephone 610.992.0727
Page 1 of 12
Facsimile 610.992.0734
E-mail: rande@randeint.com
DS-RE46C146-060605
This datasheet contains PROPRIETARY and CONFIDENTIAL information.
RANDE [ R & E INTERNATIONAL, INC. ]
