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BASIC CONNECTIONS
Pinout Description
PCB Layout
V SS
1
16
N/C
STATUS
P1
V SS
V SS
V OUT
STATUS
V DD
ST
2
3
4
5
6
7
8
15
14
13
12
11
10
9
N/C
N/C
N/C
N/C
N/C
N/C
N/C
ST
V OUT
V SS
V DD
R
1 k ?
C 0.1 μ F
C 0.01 μ F
P0
A/D In
V RH
V SS
V DD
C 0.1 μ F
.
Table 3. Pin Description
C
0.1 μ F
Pin No.
1 thru 3
4
5
6
7
8
9 thru 13
14 thru 16
Pin Name
V SS
V OUT
STATUS
V DD
V SS
ST
Trim pins
—
Description
Redundant connections to the
internal V SS and may be left
unconnected.
Output voltage of the
accelerometer.
Logic output pin to indicate fault.
The power supply ground.
The power supply input.
Logic input pin used to initiate
self-test.
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 μ 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 ? and 0.01 μ 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.
6. Accelerometer and microcontroller should not be a
high current path.
ST
V DD
Logic
Input
C1
0.1 μ F
MMA2260D
8
6 V DD V OUT
7 V SS
5
R1
1 k ?
4
C2
0.01 μ F
STATUS
Output
Signal
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.
Figure 5. SOIC Accelerometer with Recommended
Connection Diagram
MMA2260D
Sensors
Freescale Semiconductor
5
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