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MMA3202DR2 Datasheet(PDF) 5 Page - Freescale Semiconductor, Inc

Part # MMA3202DR2
Description  Surface Mount Micromachined Accelerometer
PDF  10 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MMA3202DR2 Datasheet(HTML) 5 Page - Freescale Semiconductor, Inc

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Sensors
Freescale Semiconductor
5
MMA3202D
BASIC CONNECTIONS
PINOUT DESCRIPTION
Figure 4. SOIC Accelerometer with Recommended
Connection Diagram
PCB Layout
Figure 5. Recommended PCB Layout for Interfacing
Accelerometer to Microcontroller
NOTE:
•
Use a 0.1 µF capacitor on VDD to decouple the power
source.
•
Physical coupling distance of the accelerometer to the
microcontroller should be minimal.
•
Place a ground plane beneath the accelerometer to
reduce noise, the ground plane should be attached to all
of the open ended terminals shown in Figure 5.
•
Use an RC filter of 1 kΩ and 0.01 µF on the output of the
accelerometer 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 interfere with the internal accelerometer sampling
frequency. This will prevent aliasing errors.
Table 3. Pin Descriptions
Pin No.
Pin Name
Description
1 thru 3
—
Leave unconnected.
4
—
No internal connection. Leave
unconnected.
5
ST
Logic input pin used to initiate self-test.
6
XOUT
Output voltage of the accelerometer. X
Direction.
7
STATUS
Logic output pin to indicate fault.
8
VSS
The power supply ground.
9
VDD
The power supply input.
10
AVDD
Power supply input (Analog).
11
YOUT
Output voltage of the accelerometer. Y
Direction.
12 thru 16
—
Used for factory trim. Leave
unconnected.
17 thru 19
—
No internal connection. Leave
unconnected.
20
GND
Ground.
14
15
16
17
18
19
20
8
7
6
5
4
3
2
1
13
N/C
ST
XOUT
STATUS
VDD
GND
N/C
N/C
N/C
N/C
N/C
N/C
12
10
9
11
VSS
AVDD
N/C
YOUT
N/C
N/C
N/C
N/C
10
XOUT
YOUT
MMA3202D
ST
VDD
VSS
R1
1 kΩ
C2
0.01 µF
5
9
8
Logic
Input
VDD
C1
0.1 µF
7
6
C3
0.01 µF
R2
1 kΩ
AVDD
11
Status
X Output
Signal
Y Output
Signal
P0
A/D In
VRH
VSS
VDD
ST
YOUT
VSS
VDD
0.01 µF
C
1 kΩ
0.1 µF
0.1 µF
Power Supply
C
R
C
0.1 µF
P1
STATUS
A/D In
XOUT
R
0.01 µF
C
1 kΩ
C



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