RE46C190 datasheet(1/42 Pages) MICROCHIP

Part #	RE46C190

Description	CMOS Low Voltage Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode

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Manufacturer	MICROCHIP [Microchip Technology]

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 2010 Microchip Technology Inc.

DS22271A-page 1

RE46C190

Features

• Two AA Battery Operation

• Internal Power On Reset

• Low Quiescent Current Consumption

• Available in 16L N SOIC

• Local Alarm Memory

• Interconnect up to 40 Detectors

• 9 Minute Timer for Sensitivity Control

• Temporal or Continuous Horn Pattern

• Internal Low Battery and Chamber Test

• All Internal Oscillator

• Internal Infrared Emitter Diode (IRED) driver

• Adjustable IRED Drive current

• Adjustable Hush Sensitivity

• 2% Low Battery Set Point

Description

The RE46C190 is a low power, low voltage 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 every 10 seconds, to keep the

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 is performed every

86 seconds, and chamber integrity is tested once every

43 seconds, when in Standby. The temporal horn pat-

tern supports the NFPA 72 emergency evacuation sig-

nal.

An interconnect pin allows multiple detectors to be

connected such that, when one unit alarms, all units will

sound.

An internal 9 minute timer can be used for a Reduced

Sensitivity mode.

Utilizing low power CMOS technology, the RE46C190

was designed for use in smoke detectors that comply

with Underwriters Laboratory Specification UL217 and

UL268.

PIN CONFIGURATION

RE46C190

SOIC

VSS

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

IRED

VDD

TEST

TEST2

IRP

IRN

RLED

LX

VBST

HS

HB

IO

IRCAP

FEED

GLED

CMOS Low Voltage Photoelectric Smoke Detector ASIC

with Interconnect and Timer Mode

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