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MC14568 - Low-Power CMOS Ionization Smoke Detector

General 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”).

Key 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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Other Datasheets by Freescale Semiconductor (now NXP Semiconductors)

Part Number Description
MC145010 Photoelectric Smoke Detector IC
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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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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.