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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
g-Select
g-Select
P1
V SS 0g-Detect
V DD N/C
Sleep
Figure 4. Pinout Description
Table 4. Pin Descriptions
Pin No.
Pin Name
Description
0g-Detect
Self Test
X OUT
Y OUT
Z OUT
C
C
C
P2
P3
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
0g-Detect
g-Select
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
Linear Freefall digital logic output signal
Logic input pin to select g level
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 3.3nF 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
Logic
Input
10
g-Select
0g-Detect
9
they do not interfere with the internal accelerometer
sampling frequency (11 kHz for the sampling
VDD
XOUT
Logic
Input
0.1 μF
13
6
Self Test
MMA7361L
VDD
YOUT
2
3
3.3 nF
frequency). This will prevent aliasing errors.
8. 10M Ω or higher is recommended on X OUT , Y OUT and
Z OUT to prevent loss due to the voltage divider
relationship between the internal 32 k Ω resistor and
the measurement input impedance.
5
VSS
3.3 nF
Logic
Input
7
Sleep
ZOUT
4
3.3 nF
Figure 5. Accelerometer with Recommended
Connection Diagram
MMA7361L
Sensors
Freescale Semiconductor
5
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