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RE46C144_12

Description
CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode
File Size975KB,26 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
Download Datasheet View All

RE46C144_12 Overview

CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode

RE46C144
CMOS Photoelectric Smoke Detector ASIC with Interconnect
and Timer Mode
Features
Internal Power-On Reset
Low Quiescent Current Consumption
ESD Protection on all Pins
Interconnect up to 40 Detectors
10 Minute Timer for Sensitivity Control
75% Duty Cycle Horn Pattern
Internal Low Battery and Chamber Test
Compatible with Allegro A5358
UL Recognized per File S24036
General Description
The RE46C144 is a 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 100 µs 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.
A check for a low-battery condition and chamber
integrity is performed every 43 seconds, when in
Standby. The alarm horn pattern utilizes a 75% duty
cycle.
An interconnect pin allows multiple detectors to be
connected such that when one units alarms, all units
will sound.
An internal 10 minute timer can be used for a reduced
sensitivity mode.
The RE46C144 device is recognized by
Underwriters Laboratories for use in smoke
detectors that comply with specification UL217 and
UL268.
Package Types
RE46C144
PDIP, SOIC, SOICN
C1
C2
DETECT
STROBE
V
DD
IRED
IO
HORNB
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
TEST
VSEN
V
SS
ROSC
COSC
LED
FEED
HORNS
2009-2012 Microchip Technology Inc.
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