
2–16
Motorola Sensor Device Data
For More Information On This Product,
Go to: www.freescale.com
MMA2200W
ST
VDD
VSS
VOUT
OUTPUT
SIGNAL
R1
1 k
3
C2
0.01
μ
F
2
6
5
LOGIC
INPUT
VDD
C1
0.1
μ
F
Figure 4. Wingback Accelerometer with
Recommended Connection Diagram
STATUS
4
Pinout Description for the DIP Package
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
N/C
N/C
N/C
ST
VOUT
STATUS
VSS
VDD
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
Pin No.
Pin Name
Description
1
—
Leave unconnected or connect to
signal ground.
2 thru 3
—
No internal connection. Leave un-
connected.
4
ST
Logic input pin to initiate self test.
5
VOUT
Status
Output voltage
6
Logic output pin to indicate fault.
7
VSS
VDD
Trim Pins
Signal ground
8
Supply voltage (5 V)
9 thru 13
Used for factory trim. Leave un-
connected.
14 thru 16
—
No internal connection. Leave un-
connected.
MMA1201P
ST
VDD
VSS
VOUT
OUTPUT
SIGNAL
R1
1 k
5
C2
0.01
μ
F
4
8
7
LOGIC
INPUT
VDD
C1
0.1
μ
F
Figure 5. DIP Accelerometer with Recommended
Connection Diagram
STATUS
6
PCB Layout
P0
A/D IN
VRH
VSS
VDD
ST
VOUT
VSS
VDD
0.01
μ
F
C
1 k
0.1
μ
F
C 0.1
μ
F
POWER SUPPLY
C
R
C
0.1
μ
F
M
A
Figure 6. Recommend PCB Layout for Interfacing
Accelerometer to Microcontroller
P1
STATUS
NOTES:
Use a 0.1
μ
F 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 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).
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 inter-
fere with the internal accelerometer sampling frequency.
This will prevent aliasing errors.
F
Freescale Semiconductor, Inc.
n
.