MMA3201KEGR2 FREESCALE [Freescale Semiconductor, Inc], MMA3201KEGR2 Datasheet - Page 5

• Manufacturer Part Number: MMA3201KEGR2
• Description: Surface Mount Micromachined Accelerometer
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Sensors
Freescale Semiconductor
Pinout Description
12 thru 16
17 thru 19
V
Pin No.
1 thru 3
Figure 5. SOIC Accelerometer with Recommended
DD
0.1 μF
10
11
20
4
5
6
7
8
9
C1
Logic
Input
STATUS
AV
X
V
N/C
N/C
N/C
N/C
V
OUT
ST
DD
DD
Pin Name
SS
STATUS
AV
10
X
Y
GND
V
V
5
9
8
ST
—
—
OUT
OUT
—
—
DD
SS
DD
Connection Diagram
ST
V
AV
V
DD
SS
DD
1
2
3
4
5
6
7
8
9
10
MMA3201KEG
Leave unconnected.
No internal connection. Leave
unconnected.
Logic input pin used to initiate self-test.
Output voltage of the accelerometer. X
Direction.
Logic output pin to indicate fault.
The power supply ground.
The power supply input.
Power supply input (Analog).
Output voltage of the accelerometer. Y
Direction.
Used for factory trim. Leave
unconnected.
No internal connection. Leave
unconnected.
Ground.
X
Y
OUT
OUT
7
6
11
20
19
18
17
16
15
14
13
12
11
Description
0.01 μF
0.01 μF
C3
1 kΩ
1 kΩ
R2
R1
C2
GND
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
Y
OUT
BASIC CONNECTIONS
STATUS
X Output
Signal
Y Output
Signal
PCB Layout
NOTES:
Figure 6. Recommended PCB Layout for Interfacing
1. Use a 0.1 μF capacitor on V
2. Physical coupling distance of the accelerometer to the
3. Place a ground plane beneath the accelerometer to
4. Use an RC filter of 1 kΩ and 0.01 μF on the output of
5. PCB layout of power and ground should not couple
6. Accelerometer and microcontroller should not be a
7. A/D sampling rate and any external power supply
STATUS
source.
microcontroller should be minimal.
reduce noise, the ground plane should be attached to
all of the open ended terminals shown in
the accelerometer to minimize clock noise (from the
switched capacitor filter circuit).
power supply noise.
high current path.
switching frequency should be selected such that they
do not interfere with the internal accelerometer
sampling frequency. This will prevent aliasing errors.
X
Y
V
OUT
OUT
V
ST
DD
SS
Accelerometer to Microcontroller
C 0.1 μF
Power Supply
1 kΩ
1 kΩ
R
R
C
C
C 0.1 μF
0.1 μF
0.1 μF
P1
P0
A/D In
A/D In
V
DD
RH
to decouple the power
V
V
MMA3201KEG
DD
SS
Figure
C 0.1 μF
6.
5