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參數(shù)資料
| 型號： | MMA7450LR1 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | 【2g/【4g/【8g Three Axis Low-g Digital Output Accelerometer |
| 中文描述： | 【2克/【4克/【八克三三軸低g加速度計的數(shù)字輸出 |
| 文件頁數(shù)： | 10/22頁 |
| 文件大?。?/td> | 389K |
| 代理商： | MMA7450LR1 |
Sensors
10
Freescale Semiconductor
MMA7450L
BASIC CONNECTIONS
Pin Descriptions
Figure 14. Pinout Description
Recommended PCB Layout for Interfacing
Accelerometer to Microcontroller
Figure 15. I
2
C Connection to MCU
Figure 16. SPI Connection to MCU
NOTES:
1. Use 100 nF 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 15
and
Figure 16
.
4. PCB layout of power and ground should not couple
power supply noise.
5. Accelerometer and microcontroller should not be a
high current path.
6. Any external power supply switching frequency
should be selected such that they do not interfere
with the internal accelerometer sampling frequency
(sampling frequency). This will prevent aliasing
errors.
Table 6. Pin Descriptions
Pin No.
Pin Name
Description
1
DVDD_IO
Digital power supply for I/O pads
3, 10,
11
NC
No Connection or connect to GND
4
IADDR0
I
2
C Address bit 0 (optional)
2, 5
GND
Ground
6
AVDD
Analog power supply (main power supply)
7
CS
SPI enable, I
2
C/SPI mode selection
(1:1
2
C, 0:SPI enabled)
8
INT1/DRDY
Interrupt1 / Data Ready
9
INT2
Interrupt2
12
SDO
SPI Serial Data Output
13
SDA/SDI/
SDO
I
2
C Serial Data (SDA), SPI Serial Data
Input (SDI), 3-wire interface Serial Data
Output (SDO)
14
SCL/SPC
I
2
C Serial Clock (SCL), SPI Serial Clock
(SPC)
1
2
3
4
5
6
7
8
9
1
1
1
1
1
AVdd
GND
DVdd_IO
S
C
INT1/DRDY
INT2
N/C
SDO
SDA/SDI/SDO
N/C
N/C
N/C
GND
Top View
100uF
100uF
100uF
100uF
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