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BASIC CONNECTIONS
Pin Descriptions
Top View
N/C
PCB Layout
POWER SUPPLY
N/C
X OUT
Y OUT
Self Test
N/C
N/C
V DD
V SS
Sleep
C
C
V RH
P0
V DD
V SS
C
Z OUT
N/C
V SS
V DD
N/C
N/C
Self Test
P1
Sleep
Figure 4. Pinout Description
Table 3. Pin Descriptions
Pin No.
Pin Name
Description
X OUT
Y OUT
Z OUT
C
C
C
A/D IN
A/D IN
A/D IN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
N/C
X OUT
Y OUT
Z OUT
V SS
V DD
Sleep
NC
NC
NC
N/C
N/C
Self Test
N/C
No internal connection
Leave unconnected
X direction output voltage
Y direction output voltage
Z direction output voltage
Power Supply Ground
Power Supply Input
Logic input pin to enable product or Sleep Mode
No internal connection
Leave unconnected
Leave unconnected
Leave unconnected
Unused for factory trim
Leave unconnected
Unused for factory trim
Leave unconnected
Input pin to initiate Self Test
Unused for factory trim
Leave unconnected
Figure 6. Recommended PCB Layout for Interfacing
Accelerometer to Microcontroller
NOTES:
1. Use 0.1 μF 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 a 0.1uF capacitor on the outputs 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.
7. A/D sampling rate and any external power supply
switching frequency should be selected such that
XOUT
VDD
Logic
Input
13
Self Test
MMA7368L
2
0.1 μ F
they do not interfere with the internal accelerometer
sampling frequency (11 kHz for the sampling
frequency). This will prevent aliasing errors.
6
VDD
0.1 μF
5
VSS
YOUT
3
0.1 μ F
Logic
Input
7
Sleep
ZOUT
4
0.1 μ F
Figure 5. Accelerometer with Recommended
Connection Diagram
MMA7368L
Sensors
Freescale Semiconductor
5
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