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MMA1211 Datasheet

  • MMA1211

  • Freescale Semiconductor, Inc [Surface Mount Micromachined A...

  • FREESCALE

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BASIC CONNECTIONS
Pinout Description
PCB Layout
STATUS
Accelerometer
ST
V
OUT
V
SS
V
DD
R
1 k鈩?/div>
C 0.1
碌F
V
RH
C
0.1
碌F
C 0.01
碌F
P1
Microcontroller
P0
A/D In
N/C
N/C
N/C
ST
V
OUT
STATUS
V
SS
V
DD
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
V
SS
C
V
DD
0.1
碌F
Table 3. Pin Descriptions
Pin No.
1 thru 3
4
5
6
7
8
9 thru 13
14 thru 16
Pin Name
鈥?/div>
ST
V
OUT
STATUS
V
SS
V
DD
Trim pins
鈥?/div>
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
Power Supply
Figure 6. Recommended PCB Layout for Interfacing
Accelerometer to Microcontroller
NOTES:
1. Use a 0.1
碌F
capacitor on V
DD
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 k鈩?and 0.01
碌F
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.
V
DD
Logic
Input
4
MMA1211D
ST
V
OUT
6
R1
1 k鈩?/div>
STATUS
Output
Signal
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.
8 V
DD
5
C1
0.1
碌F
7 V
SS
C2
0.01
碌F
Figure 5. SOIC Accelerometer with Recommended
Connection Diagram
MMA1211D
Sensors
Freescale Semiconductor
5

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  • 英文版
    Freescale Semiconductor, Inc [Surface Mount Micromachined A...
    FREESCALE
  • 英文版
    Freescale Semiconductor, Inc [Surface Mount Micromachined A...
    FREESCALE
  • 英文版
    Freescale Semiconductor, Inc [Surface Mount Micromachined A...
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  • 英文版
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  • 英文版
    Surface Mount Micromachined Accelerometer
    MOTOROLA
  • 英文版
    Surface Mount Micromachined Accelerometer
    FREESCALE
  • 英文版
    Surface Mount Micromachined Accelerometer
    MOTOROLA [...
  • 英文版
    Sensor
    MOTOROLA [...
  • 英文版
    MICROMACHINED ACCELEROMETER
    MOTOROLA
  • 英文版
    MICROMACHINED ACCELEROMETER
    MOTOROLA [...
  • 英文版
    Sensor
    MOTOROLA [...
  • 英文版
    Surface Mount Micromachined Accelerometer
    MOTOROLA
  • 英文版
    Surface Mount Micromachined Accelerometer
    FREESCALE
  • 英文版
    Surface Mount Micromachined Accelerometer
    MOTOROLA [...
  • 英文版
    Surface Mount Micromachined Accelerometer
    MOTOROLA
  • 英文版
    Surface Mount Micromachined Accelerometer
    FREESCALE
  • 英文版
    Surface Mount Micromachined Accelerometer
    MOTOROLA [...

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