MMA1213D 查看數據表（PDF） - Motorola => Freescale
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MMA1213D Datasheet PDF : 8 Pages
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Freescale Semiconductor, Inc.
BASIC CONNECTIONS
Pinout Description
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
Status
P1
ST
P0
VOUT
R
A/D In
VSS
1 kΩ C 0.01 µF
C 0.1 µF
VDD
VRH
C 0.1 µF
VSS
C 0.1 µF
VDD
Pin No.
1 thru 3
4
5
6
7
8
9 thru 13
14 thru 16
Pin Name
—
ST
VOUT
STATUS
VSS
VDD
Trim pins
—
Description
Leave unconnected.
Logic input pin used to initiate
self-test.
Output voltage of the
accelerometer.
Logic output pin to indicate
fault.
The power supply ground.
The power supply input.
Used for factory trim. Leave
unconnected.
No internal connection. Leave
unconnected.
VDD
Logic
Input
C1
0.1 µF
MMA1213D 6
4 ST
R1
8 VDD
1 kΩ
VOUT 5
7 VSS
C2
0.01 µF
Status
Output
Signal
Power Supply
Figure 5. Recommended PCB Layout for Interfacing
Accelerometer to Microcontroller
NOTES:
• 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.
Figure 4. Accelerometer with Recommended
Connection Diagram
Motorola Sensor Device Data
For More Information On This Product,
Go to: www.freescale.com
MMA1213D
5
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