RE46C145(2009) 查看數據表（PDF） - Microchip Technology

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RE46C145
(Rev.:2009)

CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode

Microchip Technology 

R&E International

A Subsidiary of Microchip Technology Inc.

RE46C145

CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode

Product Specification

General Description

The RE46C145 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.

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.

In the diagnostic mode the photo amplifier output is

available on pin 15 for production calibration of the photo

chamber.

A check for a low battery condition and chamber integrity

is performed every 43 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 can be used for a reduced

sensitivity mode.

The RE46C145 is recognized by Underwriters

Laboratories for use in smoke detectors that comply with

specification UL217 and UL268.

Features

• Internal Power On Reset

• Low Quiescent Current Consumption

• Available in 16L PDIP, 16L N SOIC or 16L W SOIC

• ESD Protection on all Pins

• Interconnect up to 40 Detectors

• 10 Minute Timer for Sensitivity Control

• Temporal Horn Pattern

• Internal Low Battery and Chamber Test

• Compatible with Allegro A5366

• Alternate Diagnostic Mode

• UL Recognized per File S24036

• Available in Standard Packaging or RoHS

Compliant Pb Free Packaging.

Pin Configuration

C1

1

C2

2

DETECT 3

STROBE

4

VDD 5

IRED 6

IO 7

HORNB

8

16 TEST

15 VSEN

14 VSS

13 ROSC

12 COSC

11 LED

10 FEED

9 HORNS

ABSOLUTE MAXIMUM RATINGS

PARAMETER

SYMBOL

VALUE

UNITS

Supply Voltage

VDD

15

V

Input Voltage Range Except FEED, IO

FEED Input Voltage Range

IO Input Voltage Range

Input Current except FEED

Operating Temperature

Storage Temperature

Vin

Vinfd

Vio1

Iin

TA

TSTG

-.3 to Vdd +.3

V

-10 to +22

V

-.3 to 17

V

10

mA

-25 to 75

°C

-55 to 125

°C

Maximum Junction Temperature

TJ

150

°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.

DS22181B-page 1

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