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AN4009

更新时间： 2024-11-14 03:18:47

品牌	Logo	应用领域
飞思卡尔 - FREESCALE		/
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4页	266K
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ALARM IC SAMPLE APPLICATIONS

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中文翻译

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数据手册

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AN4009 数据手册

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by AN4009/D

Freescale Semiconductor

Prepared by: Rudi Lenzen

Application Engineer, Toulouse France

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 bat-

tery comparator indicating the state of the power supply.

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–inte-

grate 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

motionare employed, for example. However, this paper’s pur-

pose is to introduce you to just a few applications for which the

MC14600 is a perfect fit.

TEMPERATURE LEVEL DETECTOR

When connected to a simple network of thermistor and re-

sistors, the Alarm IC provides a portable solution for tempera-

ture control and supervision. The example hereafter uses an

NTC thermistor.

GAS SENSOR APPLICATION

An audible alarm will sound when the threshold value at the

comparator input is reached. A logic output is usable for start-

ing either a fan or a heater depending upon the required tem-

perature.

The MC14600, used with a flammable gas sensor and a few

added components, provides a reliable solution for gas detec-

tion.

When gas leakage is detected, the sensing resistor de-

creases typically by a factor 3 or 4 as the gas concentration

reaches10percentofthelowerexplosivelimit. Duringthecal-

ibration sequence (test under gas), a variable resistor is used

to set the trigger level of the Alarm IC comparator which, in re-

sponse, drives a piezo horn.

By adding a thermistor—with negative temperature coeffi-

cient (NTC) in this case—in the detection circuit, the variation

of the sensor resistance with temperature is easily compen-

sated, avoiding false alarms when the room temperature in-

creases.

SUPPLY

ALARM IC

LED

P15

–

PIEZO–HORN

LOGICAL

P13

LOW BATTERY

DETECTION

SUPPLY

Figure 2. Temperature Level Example

CALIBRATION

RESISTOR

ALARM IC

LED

SENSOR

P15

P13

–

PIEZO–HORN

LOGICAL

LOW BATTERY

DETECTION

Figure 1. Gas Detection Example

For More Information On This Product,

Go to: www.freescale.com

12 3 4

中文翻译

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