MC14568 Datasheet (Freescale Semiconductor) - Low-Power CMOS Ionization Smoke Detector

MC14568, Low-Power CMOS Ionization Smoke Detector

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”).

When a high-to-low transition occurs at pin 1, the internal timer is reset, the timer mode enabled, and the circuit reset to a no alarm

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 specification

MC14568 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