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MPXM2102AS Datasheet(PDF) 116 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) 116 Page - Motorola, Inc

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AN1612
2–80
Motorola Sensor Device Data
www.motorola.com/semiconductors
Figure 7. Silk Screen of the PCB
GND
SHOCK & MUTE
PAGER
R4
R2
C6
C12
R1
R3
U4
C11
R8
U5
R6
S1
C5
C10
R5
C3
C4
X1
D1
9V
J2
C9
U1
U2
S2
C7 C8 C2 C1
R9
R7
J1
Figure 8. Solder Side of the PCB
Table 1. Bill of Material for the Shock and Mute Pager
Device Type
Qty.
Value
References
Ceramic Capacitor
4
0.1
µ
C1, C2, C7, C9
Ceramic Capacitor
2
22p
C3, C4
Ceramic Capacitor
3
10n
C5, C6, C8
Solid Tantalum
1
0.33
µ
C10
Electrolytic Capacitor
1
47
µ
C11
Electrolytic Capacitor
1
1
µ
C12
LED
1
5mm
D1
Header
1
2 way
J1
PCB Terminal Block
1
2 way
J2
Resistor
"5% 0.25W
1
100k
R1
Single Turn Trimmer
1
100k
R2
Resistor
"5% 0.25W
4
10k
R3, R5, R7, R9
Resistor
"5% 0.25W
1
10M
R4
Resistor
"5% 0.25W
1
180R
R6
Resistor
"5% 0.25W
1
1k
R8
Push Button
2
6mm
S1, S2
MMA1201P
1
—
U1
LM311N
1
—
U2
MC68HC705B16CFN
1
—
U3
Piezo Transducer
1
—
U4
MC78L05ACP
1
—
U5
Crystal
1
4MHz
X1
Figure 9. Component Side of the PCB
SOFTWARE DESCRIPTION
Upon powering up the system, the piezo audio transducer
is activated simulating an incoming page, if the pager is in
sound mode (jumper J1 in ON). Then, the accelerometer is
powered up and the output of the comparator is sampled to
obtain the logic level. The “beeping” will continue until the
accelerometer senses an impact greater than the threshold
level. Only then the alert is muted. However when the pager
is in silence mode (jumper J1 is OFF), which is indicated by the
blinking red LED, the accelerometer is not activated. To stop
the alert, press the push–button S2.
To repeat the whole process, simply push the reset switch S1.
Figure 10 is a flowchart for the program that controls the
system.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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