MPXV2202DP datasheet(661/670 Pages) MOTOROLA

661 / 670 page

AN1690

4–69

Motorola Sensor Device Data

www.motorola.com/semiconductors

Motorola’s pressure sensors can also provide the input to

the MC14600. The MPX5000 series includes a wide variety of

compensated and integrated pressure sensors with different

pressure ranges, packaging and measurement options. One

possible sensor is the MPXV5010. The output of the

MPXV5010 can be fed directly into the input of the MC14600

(pin 15). If the latch described above is used with a pressure

sensor resistors may be required at the output of the

MPXV5010 to scale the output voltage (See Figure 8). This is

because the output voltage for pressure sensors in the

MPX5000 series under no pressure is 0.2 V, which may be be-

low the lowered alarm threshold. (See previous section.)

Figure 8. Pressure Detection Circuit

VDD

OUTPUT TO

PIN 15 (ALARM

DETECT INPUT)

MPXV5010

CONCLUSION

The MC14600 offers a simple solution for use in a wide vari-

ety of alarm applications. With a high impedance input pin it

can be connected to many types of sensor devices. For sen-

sor inputs that require a latched alarm condition there are sev-

eral simple ways to add this option to the MC14600. It has the

feature of not having a predetermined alarm threshold which

gives it the flexibility of being set to any level as required by the

application. The MC14600 has an internal horn driver that can

drive a three leaded piezo horn with the addition of two resis-

tors and one capacitor. The MC14600 integrates the features

desired in alarm devices into a small and simple package that

is still flexible enough for all types of alarm applications.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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