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BASIC CONNECTIONS
Pin Descriptions
Top View
PCB Layout
N/C
POWER SUPPLY
N/C
X OUT
Y OUT
N/C
GND
N/C
N/C
g-Select
V DD
V SS
Sleep
C
C
V RH
P0
V DD
V SS
C
V SS
V DD
N/C
N/C
g-Select
GND
P1
Sleep
Figure 4. Pinout Description
Table 4. Pin Descriptions
Pin No. Pin Name
Description
X OUT
Y OUT
C
C
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
N/C
V SS
V DD
Sleep
NC
N/C
g-Select
N/C
N/C
GND
N/C
No internal connection. Leave unconnected.
X direction output voltage.
Y direction output voltage,
Unused for factory trim. Leave unconnected.
Power Supply Ground.
Power Supply Input.
Logic input pin to enable product or Sleep Mode
No internal connection. Leave unconnected.
No internal connection. Leave unconnected.
Logic input pin to select g level
Unused for factory trim. Leave unconnected.
Unused for factory trim. Leave unconnected.
Connect to Ground.
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 3.3 nF 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
Logic
Input
10
g-Select
MMA6361L
high current path.
7. A/D sampling rate and any external power supply
switching frequency should be selected such that
VDD
13
6
GND
VDD
XOUT
2
3.3 nF
they do not interfere with the internal accelerometer
sampling frequency (11 kHz for the sampling
frequency). This will prevent aliasing errors.
8. 10 M 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
0.1 μF
5
VSS
YOUT
3
3.3 nF
the measurement input impedance.
Logic
Input
7
Sleep
Figure 5. Accelerometer with Recommended
Connection Diagram
MMA6361L
Sensors
Freescale Semiconductor
5
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