AN4009

www.DataSheet4U.com Freescale Semiconductor Order this document by AN4009/D Alarm IC Sample Applications Prepared by: Rudi Lenzen Application Engineer, Toulouse France AN4009 INTRODUCTION The MC14600 is an integrated circuit (IC) designed for low– cost applications requiring an alarm to be triggered and heard. This device affords the designer a low–cost, easy–to–integrate solution, where board space and design time are at a premium. The Alarm IC can be used in multiple applications, such as personal, home and auto safety/security devices; door, gate and pool alarms; and even toys, where lasers and motion are employed, for example. However, this paper’s purpose is to introduce you to just a few applications for which the MC14600 is a perfect fit. The logical output is useful to signal a remote control station that a gas leakage has been detected. When using a low power sensor, the circuit is fully compliant with a portable solution enhanced by the integrated low battery comparator indicating the state of the power supply. Freescale Semiconductor, Inc... TEMPERATURE LEVEL DETECTOR When connected to a simple network of thermistor and resistors, the Alarm IC provides a portable solution for temperature control and supervision. The example hereafter uses an NTC thermistor. An audible alarm will sound when the threshold value at the comparator input is reached. A logic output is usable for starting either a fan or a heater depending upon the required temperature. GAS SENSO...