MPXM2102AS datasheet(658/670 Pages) MOTOROLA

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Motorola Sensor Device Data

www.motorola.com/semiconductors

AN1690

Alarm IC General Applications Overview

Prepared by: Leticia Gomez and Diana Pelletier

Sensor Applications Engineering

Motorola Semiconductor Products Sector

Phoenix, Arizona

INTRODUCTION

The MC14600, an IC designed for alarm applications, is a

versatile part that can easily be configured with a minimum

number of external components to serve a wide range of alarm

applications and circuit configurations. For example, the

MC14600 can be used in systems that detect pressure and

temperature change, liquid levels, motion or intrusion. This

application note presents considerations in interfacing exter-

nal components to the MC14600 and an approach for config-

uring it with a latch.

The MC14600 Alarm IC can be simply described as a

comparator that determines whether an alarm condition exists

and in response drives a piezo horn. As illustrated in Figure 1

the MC14600 is more than a comparator and a horn driver. It

drives an LED to indicate the device is working and has inter-

nal low battery detection circuitry. In the event of a low battery

the MC14600 provides the signal to chirp the piezo horn. It

also has a logical output that can be used to drive other out-

puts such as an LED. The MC14600 alarm threshold and

oscillator speed are set externally providing system design

flexibility. Figure 2 is a detailed block diagram of the MC14600

that includes the pin numbers referenced in this document.

Figure 1. Alarm IC Concept

INPUT

–

ALARM THRESHOLD

LOW BATTERY

DETECTION

LOGICAL OUTPUT

PIEZO HORN

LED

Figure 2. MC14600 Block Diagram

HORN FEEDBACK

HORN

OUT 2

HORN

OUT 1

ALARM

LOGIC

OSC

AND

TIMING

LED

VDD = PIN 6

VSS = PIN 9

VDD

–

LOW BATTERY

COMPARATOR

VDD

LOW V COMP.

OUT

VDD

LOW V SET

DETECT

COMPARATOR OUT

–

DETECT

COMPARATOR

ALARM

THRESHOLD

ALARM DETECT

INPUT

–

VDD

HI–Z

GUARD

AMP

Cosc

Rbias

MOTOROLA

SEMICONDUCTOR APPLICATION NOTE

REV 3

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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