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MMA7331LC 数据表(PDF) 5 Page - Freescale Semiconductor, Inc

部件名 MMA7331LC
功能描述  짹4g, 짹9g Three Axis Low-g Micromachined Accelerometer
PDF  11 Pages
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制造商  FREESCALE [Freescale Semiconductor, Inc]
网页  http://www.freescale.com
标志 FREESCALE - Freescale Semiconductor, Inc

MMA7331LC 数据表(HTML) 5 Page - Freescale Semiconductor, Inc

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Sensors
Freescale Semiconductor
5
MMA7331LC
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 XOUT, YOUT and
ZOUT 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
1N/C
No internal connection
Leave unconnected
2XOUT
X direction output voltage
3YOUT
Y direction output voltage
4ZOUT
Z direction output voltage
5
VSS
Power Supply Ground
6VDD
Power Supply Input
7
Sleep
Logic input pin to enable product or Sleep Mode
8N/C
No internal connection
Leave unconnected
9N/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
Self Test
Input pin to initiate Self Test
14
N/C
Unused for factory trim
Leave unconnected
N/C
XOUT
ZOUT
YOUT
VSS
VDD
Sleep
N/C
N/C
g-Select
Self Test
N/C
N/C
N/C
Top View
2
3
4
3.3 nF
3.3 nF
3.3 nF
13
10
6
5
7
Logic
Input
Logic
Input
Logic
Input
0.1 μF
VDD
VDD
VSS
g-Select
Self Test
Sleep
XOUT
YOUT
ZOUT
MMA7331L
MMA7331LC
POWER SUPPLY
VDD
VSS
Sleep
g-Select
XOUT
YOUT
ZOUT
VDD
VSS
VRH
P0
P1
A/DIN
A/DIN
A/DIN
C
C
C
C
C
C
C
C
Self Test
P2



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