Freescale Semiconductor, Inc.
4
6
5
MMA1201P
STATUS
MMA2200W
V
STATUS
V
V
DD
DD
LOGIC
INPUT
4
8
LOGIC
INPUT
ST
V
2
6
ST
V
R1
1 kΩ
R1
1 kΩ
OUTPUT
SIGNAL
3
OUTPUT
SIGNAL
V
DD
OUT
DD
OUT
C1
0.1 µF
C1
0.1 µF
C2
C2
0.01 µF
0.01 µF
7
V
SS
5
V
SS
Figure 5. DIP Accelerometer with Recommended
Connection Diagram
Figure 4. Wingback Accelerometer with
Recommended Connection Diagram
PCB Layout
STATUS
P1
ST
P0
V
SS
Pinout Description for the DIP Package
V
OUT
A/D IN
R
C
0.1 µF
C
1 kΩ
0.01 µF
V
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SS
V
DD
N/C
N/C
N/C
ST
N/C
N/C
C
0.1 µF
V
DD
V
RH
N/C
N/C
C
0.1 µF
V
N/C
N/C
N/C
OUT
STATUS
POWER SUPPLY
V
SS
V
DD
N/C
Figure 6. Recommend PCB Layout for Interfacing
Accelerometer to Microcontroller
NOTES:
•
•
•
Use a 0.1 µF capacitor on V
source.
to decouple the power
DD
Pin No.
Pin Name
Description
Physical coupling distance of the accelerometer to the
microcontroller should be minimal.
1
—
Leave unconnected or connect to
signal ground.
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 4.
2 thru 3
—
No internal connection. Leave un-
connected.
•
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).
4
ST
Logic input pin to initiate self test.
Output voltage
5
V
OUT
6
Status
Logic output pin to indicate fault.
Signal ground
•
•
•
PCB layout of power and ground should not couple power
supply noise.
7
8
V
SS
Accelerometer and microcontroller should not be a high
current path.
V
DD
Supply voltage (5 V)
9 thru 13
Trim Pins
Used for factory trim. Leave un-
connected.
A/Dsamplingrateandanyexternalpowersupplyswitching
frequency should be selected such that they do not inter-
fere with the internal accelerometer sampling frequency.
This will prevent aliasing errors.
14 thru 16
—
No internal connection. Leave un-
connected.
2–16
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Motorola Sensor Device Data
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