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MPXM2102AS 数据表(PDF) 64 Page - Motorola, Inc

部件名 MPXM2102AS
功能描述  Sensor
PDF  670 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  MOTOROLA [Motorola, Inc]
网页  http://www.freescale.com
标志 MOTOROLA - Motorola, Inc

MPXM2102AS 数据表(HTML) 64 Page - Motorola, Inc

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MMA1250D
2–28
Motorola Sensor Device Data
www.motorola.com/semiconductors
BASIC CONNECTIONS
10
11
12
13
14
15
16
8
7
6
5
4
3
2
1
9
VSS
VSS
VSS
VOUT
STATUS
VDD
VSS
ST
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
Figure 4. Pinout Description
Pin No.
Pin Name
Description
1 thru 3
VSS
Redundant connections to the internal
VSS and may be left unconnected.
4
VOUT
Output voltage of the accelerometer.
5
STATUS
Logic output pin used to indicate fault.
6
VDD
The power supply input.
7
VSS
The power supply ground.
8
ST
Logic input pin used to initiate self–
test.
9 thru 13
Trim pins
Used for factory trim.
Leave unconnected.
14 thru 16
—
No internal connection.
Leave unconnected.
MMA1250D
ST
VDD
VSS
VOUT
OUTPUT
SIGNAL
R1
1 k
Ω
4
C2
0.1
µF
8
6
7
LOGIC
INPUT
VDD
C1
0.1
µF
Figure 5. SOIC Accelerometer with Recommended
Connection Diagram
STATUS
5
3
2
1
VSS
VSS
VSS
PCB Layout
P0
A/D IN
VRH
VSS
VDD
ST
VOUT
VSS
VDD
0.1
µF
C
1 k
Ω
0.1
µF
C 0.1
µF
POWER SUPPLY
C
R
C
0.1
µF
Figure 6. Recommended PCB Layout for Interfacing
Accelerometer to Microcontroller
P1
STATUS
NOTES:
• Use a 0.1 µF capacitor on VDD to decouple the power
source.
• Physical coupling distance of the accelerometer to the mi-
crocontroller should be minimal.
• Place a ground plane beneath the accelerometer to reduce
noise, the ground plane should be attached to all internal
VSS terminals shown in Figure 4.
• Use an RC filter of 1 kΩ and 0.1 µF on the output of the ac-
celerometer to minimize clock noise (from the switched
capacitor filter circuit).
• PCB layout of power and ground should not couple power
supply noise.
• Accelerometer and microcontroller should not be a high
current path.
• A/D sampling rate and any external power supply switching
frequency should be selected such that they do not inter-
fere with the internal accelerometer sampling frequency.
This will prevent aliasing errors.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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