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MPXM2102AS Datasheet(PDF) 473 Page - Motorola, Inc

No. de pieza MPXM2102AS
Descripción Electrónicos  Sensor
PDF  670 Pages
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Fabricante Electrónico  MOTOROLA [Motorola, Inc]
Página de inicio  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MPXM2102AS Datasheet(HTML) 473 Page - Motorola, Inc

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AN1536
3–327
Motorola Sensor Device Data
www.motorola.com/semiconductors
counter, (3) turning off Q1, and (4) charging C8 and waiting for
the three (U6) comparator outputs to change from 1 to 0.
When
the
comparator
outputs
change
state,
the
microcontroller free running counter value is clocked into the
microcontroller’s input capture register. Contained in this
register then is the number of counts required to charge C8 to
a value large enough to trip the comparators. Via software, the
voltage signal from U3 (corresponding to the applied pressure
signal) can be compared to the “reference.”
The boat speed display for this design employs an
MC145453 LCD driver and four–digit liquid crystal display, of
which three digits and a decimal point are used. Figure 4
shows the connections between the display driver and the
display.
The
display
driver
is
connected
to
the
microprocessor’s serial peripheral interface (SPI). The
software necessary to initialize, format and drive the LCD is
included in the software listing contained in this article.
Figure 3. Analog–to–Digital Converter Front End with Microcontroller
–
+
LM139A
–
+
LM139A
–
+
LM139A
INPUT CAPTURE
REGISTER 1
GENERAL PURPOSE
OUTPUT
INPUT CAPTURE
REGISTER 2
INPUT CAPTURE
REGISTER 3
+8
LM334Z–3
U7
D2 (APPROX. 470
µA)
1N914
R13
147
Ω
R14
1.5 k
5%
R12
4.7
Ω
5%
2N7000
Q1
C8
0.47
µF
POLYCARBONATE
10
11
8
9
4
5
13
14
2
32
27
33
34
+5
R10
10 k
5%
R11
10 k
5%
+8
3
1/4 U6C
R9
10 k
5%
1/4 U6B
1/4 U6A
FROM U3–7
FROM U3–1
12
VREF
(APPROX. 4.5 V)
IC1 (PA2)
PA7
IC2 (PA1)
IC3 (PA0)
MC68HC711E9
+5
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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