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Motorola Sensor Device Data
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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.
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Freescale Semiconductor, Inc.
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