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MC14568

Freescale Semiconductor

Low-Power CMOS Ionization Smoke Detector

www.DataSheet4U.com Freescale Semiconductor Product Preview Document Number: MC14568 Rev. 1.0, 11/2006 Low-Power CMOS...



MC14568

Freescale Semiconductor


Octopart Stock #: O-570107

Findchips Stock #: 570107-F

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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 piezo
More View electric 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 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 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. © Freescale Semiconductor, Inc., 2006. All rights reserved. FEEDBACK 8 6 VDD I/O 2 VDD 11 HORN 2 10 HORN 1 LOW-V SET. 3 – + LOGIC 5 LED VDD Power On Reset TIMING RES. 7 SENSITIVITY SET. 13 + – + – –Supply 9 VDD VSS 13 15 16 Oscillator & Timing OSC CAP. 12 4 ( ) 1 TIMER OUT TIMER START Figure 2. Functional Block Diagram Table 1. Maximum Ratings Rating Supply Voltage Range Input Voltage Range Maximum Current (Source/Sink) by Pins 6 (VDD) and Pin 9 (VSS) Maximum Current Input Pins Maximum Current Output Pins (Pins 2, 4, 5, 10, 11) Maximum Current (Pin 15) Operating Temperature Range






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