MMA1200DR2 データシートの表示（PDF） - Freescale Semiconductor
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MMA1200DR2 Datasheet PDF : 10 Pages
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Pinout Description
BASIC CONNECTIONS
PCB Layout
N/C 1
N/C
2
N/C
3
ST
4
VOUT
5
STATUS 6
VSS
7
VDD
8
16 N/C
15 N/C
14 N/C
13 N/C
12 N/C
11 N/C
10 N/C
9 N/C
Table 3. Pin Descriptions
Pin No. Pin Name
Description
1 thru 3
—
Leave unconnected.
4
ST Logic input pin used to initiate self-test.
5
VOUT Output voltage of the accelerometer.
6
STATUS Logic output pin to indicate fault.
7
8
9 thru 13
VSS The power supply ground.
VDD The power supply input.
Trim pins Used for factory trim. Leave unconnected.
14 thru 16
—
No internal connection. Leave
unconnected.
VDD
Logic
Input
C1
0.1 µF
MMA1200D
4 ST
8 VDD
VOUT
6
R1
5 1 kΩ
7 VSS
C2
0.01 µF
STATUS
Output
Signal
Figure 5. SOIC Accelerometer with Recommended
Connection Diagram
STATUS
P1
ST
P0
VOUT
VSS
VDD
R
A/D In
1 kΩ C 0.01 µF
C 0.1 µF
VRH
C 0.1 µF
VSS
C 0.1 µF
VDD
Power Supply
Figure 6. Recommended PCB Layout for Interfacing
Accelerometer to Microcontroller
NOTES:
1. Use a 0.1 µF capacitor on VDD to decouple the power
source.
2. Physical coupling distance of the accelerometer to the
microcontroller should be minimal.
3. 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 6.
4. 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).
5. PCB layout of power and ground should not couple
power supply noise.
6. Accelerometer and microcontroller should not be a
high current path.
7. 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.
Sensors
Freescale Semiconductor
MMA1200D
5
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