MMA7450L 查看數據表（PDF） - Freescale Semiconductor

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MMA7450L

±2g/±4g/±8g Three Axis Low-g Digital Output Accelerometer

Freescale Semiconductor 

Pin Descriptions

Top View

BASIC CONNECTIONS

Recommended PCB Layout for Interfacing

Accelerometer to Microcontroller

INT1/DRDY

INT2

N/C

N/C

SDO

SDA/SDI/SDO

AVdd

GND

N/C

N/C

GND

DVdd_IO

100uF

100uF

Figure 14. Pinout Description

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 I2C Address bit 0 (optional)

2, 5

GND Ground

6

AVDD Analog power supply (main power supply)

7

CS

SPI enable, I2C/SPI mode selection

(1:12C, 0:SPI enabled)

8 INT1/DRDY Interrupt1 / Data Ready

9

INT2 Interrupt2

12

SDO SPI Serial Data Output

13

SDA/SDI/ I2C Serial Data (SDA), SPI Serial Data

SDO

Input (SDI), 3-wire interface Serial Data

Output (SDO)

14

SCL/SPC I2C Serial Clock (SCL), SPI Serial Clock

(SPC)

NOTES:

1. Use 100 nF 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 15

and Figure 16.

4. PCB layout of power and ground should not couple

power supply noise.

MMA7450L

10

Figure 15. I2C Connection to MCU

100uF

100uF

Figure 16. SPI Connection to MCU

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.

Sensors

Freescale Semiconductor

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