RE46C144_12 datasheet(1/26 Pages) MICROCHIP

Part #	RE46C144

Description	CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode

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Manufacturer	MICROCHIP [Microchip Technology]

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 2009-2012 Microchip Technology Inc.

DS22180C-page 1

RE46C144

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

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

C2

DETECT

STROBE

VDD

IRED

IO

HORNB

TEST

VSEN

VSS

ROSC

COSC

LED

FEED

HORNS

CMOS Photoelectric Smoke Detector ASIC with Interconnect

and Timer Mode

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RE46C144 Datasheet(PDF) 1 Page - Microchip Technology

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