MMA1200 Freescale Semiconductor, MMA1200 Datasheet - Page 5

• Manufacturer Part Number: MMA1200
• Description: Surface Mount Micromachined Accelerometer
• Manufacturer: Freescale Semiconductor

Sensors
Freescale Semiconductor
Pinout Description
Table 3. Pin Descriptions
14 thru 16
9 thru 13
Pin No.
1 thru 3
Figure 5. SOIC Accelerometer with Recommended
V
DD
0.1 µF
4
5
6
7
8
C1
Logic
Input
STATUS
Pin Name
Trim pins Used for factory trim. Leave unconnected.
STATUS
V
V
V
N/C
N/C
N/C
V
OUT
V
V
ST
ST
—
OUT
—
SS
DD
SS
DD
7
4
8 V
Connection Diagram
V
ST
SS
DD
1
2
3
4
5
6
7
8
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.
No internal connection. Leave
unconnected.
MMA1200D
V
OUT
16
15
14
13
12
11
10
9
Description
6
5
0.01 µF
1 kΩ
R1
C2
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
BASIC CONNECTIONS
STATUS
Output
Signal
PCB Layout
NOTES:
Figure 6. Recommended PCB Layout for Interfacing
1. Use a 0.1 µF capacitor on V
2. Physical coupling distance of the accelerometer to the
3. Place a ground plane beneath the accelerometer to
4. Use an RC filter of 1 kΩ and 0.01 µF on the output of
5. PCB layout of power and ground should not couple
6. Accelerometer and microcontroller should not be a
7. A/D sampling rate and any external power supply
STATUS
source.
microcontroller should be minimal.
reduce noise, the ground plane should be attached to
all of the open ended terminals shown in
the accelerometer to minimize clock noise (from the
switched capacitor filter circuit).
power supply noise.
high current path.
switching frequency should be selected such that they
do not interfere with the internal accelerometer
sampling frequency. This will prevent aliasing errors.
V
OUT
V
V
ST
SS
DD
Accelerometer to Microcontroller
C
Power Supply
0.1 µF
1 kΩ
R
C
C
0.01 µF
0.1 µF
P1
P0
A/D In
V
RH
DD
to decouple the power
V
V
DD
SS
Figure
MMA1200D
C
0.1 µF
6.
5