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MC14568 - Low-Power CMOS Ionization Smoke Detector

Datasheet Summary

Description

TIMER START (PIN 1) An internal timer is provided that can be used in various configurations to allow for a period of reduced smoke detector sensitivity (“hush”).

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.

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Datasheet preview – MC14568

Datasheet Details

Part number MC14568
Manufacturer Freescale Semiconductor
File Size 227.17 KB
Description Low-Power CMOS Ionization Smoke Detector
Datasheet download datasheet MC14568 Datasheet
Additional preview pages of the MC14568 datasheet.

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Full PDF Text Transcription

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www.DataSheet4U.com Freescale Semiconductor Product Preview 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.
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