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MMA6331LR2 Scheda tecnica(PDF) 5 Page - Freescale Semiconductor, Inc

Il numero della parte MMA6331LR2
Spiegazioni elettronici  짹4g, 짹9g Two Axis Low-g Micromachined Accelerometer
PDF  11 Pages
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Produttore elettronici  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MMA6331LR2 Scheda tecnica(HTML) 5 Page - Freescale Semiconductor, Inc

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Sensors
Freescale Semiconductor
5
MMA6331L
BASIC CONNECTIONS
Pin Descriptions
Figure 4. Pinout Description
Figure 5. Accelerometer with Recommended
Connection Diagram
PCB Layout
Figure 6. Recommended PCB Layout for Interfacing
Accelerometer to Microcontroller
NOTES:
1. Use 0.1 µF capacitor on VDD 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
high current path.
7. A/D sampling rate and any external power supply
switching frequency should be selected such that
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 and YOUT
to prevent loss due to the voltage divider relationship
between the internal 32 k
Ω resistor and the
measurement input impedance.
Table 4. Pin Descriptions
Pin No. Pin Name
Description
1
N/C
No internal connection
Leave unconnected
2XOUT
X direction output voltage
3YOUT
Y direction output voltage
4
N/C
No internal connection
Leave unconnected
5
VSS
Power Supply Ground
6VDD
Power Supply Input
7Sleep
Logic input pin to enable product or Sleep Mode
8
N/C
No internal connection
Leave unconnected
9
N/C
No internal connection
Leave unconnected
10
g-Select
Logic input pin to select g level
11
N/C
Unused for factory trim
Leave unconnected
12
N/C
Unused for factory trim
Leave unconnected
13
GND
Connect to Ground
14
N/C
Unused for factory trim
Leave unconnected
N/C
XOUT
YOUT
VSS
VDD
Sleep
N/C
N/C
N/C
N/C
N/C
g-Select
N/C
GND
Top View
2
3
3.3 nF
3.3 nF
13
6
5
7
Logic
Input
0.1 μF
VDD
VDD
VSS
GND
Sleep
XOUT
YOUT
MMA6331L
10
Logic
Input
g-Select
POWER SUPPLY
VDD
VSS
Sleep
g-Select
XOUT
YOUT
VDD
VSS
VRH
P0
P1
A/DIN
A/DIN
C
C
C
C
C
C
C
GND



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