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PC14568P/R2: DescriptionLow-Power CMOS Ionization Smoke Detector with Interconnect and Timer; File Size193KB，11 Pages; ManufacturerFREESCALE (NXP)

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PC14568P/R2 Overview

Low-Power CMOS Ionization Smoke Detector with Interconnect and Timer

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Freescale Semiconductor

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Document Number: MC14568

Rev. 1.0, 11/2006

Low-Power CMOS Ionization Smoke

Detector with Interconnect and Timer

The MC14568, when used with an ionization chamber and a small number of

external components, will detect smoke. When smoke is sensed, an alarm is

sounded via an external piezoelectric transducer and internal drivers. This circuit

is designed to operate in smoke detector systems that comply with UL217 and

UL268 specifications.

An internal oscillator with associated logic controls the overall functionality by

powering down the device for 1.67 seconds and sensing smoke in a 10 ms

window. In this way, standby current consumption is reduced to between 5.0 and

9.0

µA,

thus providing longer battery life. In addition, a networking capability

allows as many as 125 to be interconnected so that if any unit senses smoke, all

units will sound an alarm.

The MC14568 is supplied in a 16-pin dual in-line plastic package and is

designed to run on a power supply between 6 to 12 Volts.

Features

•

Speed-Up Sampling Rate of 40 ms of Internal Clock Period (Pin 12) After First

Detection of Smoke

Timer Function for Reduced Sensitivity for a Nominal Period of 6.43 Minutes

(10 Minutes Max)

High-Smoke Detection in the “Reduced Sensitivity” Mode

Internal and External Low Battery Threshold

Internal and External Smoke Reference Settings

Guaranteed Power Up Without Random LED and Horn Chirps

Reversed Battery Protection

Low Leakage Detect Pin

Metal Option to Add Double Chirp at End of Reduced Sensitivity Period;

Default is No Chirp

Pb-Free Packaging Designated by Suffix Code ED

MC14568

LOW-POWER CMOS IONIZATION

SMOKE DETECTOR WITH

INTERCONNECT AND TIMER

P SUFFIX

ED SUFFIX (PB-FREE)

PLASTIC DIP

CASE 648-08

TIMER START

I/O

LOW-V SET

TIMER OUT

LED

VDD

TIMING R

GUARD 2

DETECT INPUT

GUARD 1

SENSITIVITY SET

OSCILLATOR CAP

HORN 2

HORN 1

VSS

ORDERING INFORMATION

Device

PC14568P/R2

648-08

PC14568ED/R2

Plastic Dip

Case No.

Package

FEEDBACK

Figure 1. Pin Connections

This document contains certain information on a new product.

Specifications and information herein are subject to change without notice.

PC14568P/R2 Related Products

	PC14568P/R2	MC14568	PC14568ED/R2
Description	Low-Power CMOS Ionization Smoke Detector with Interconnect and Timer	Low-Power CMOS Ionization Smoke Detector with Interconnect and Timer	Low-Power CMOS Ionization Smoke Detector with Interconnect and Timer

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