MMA7450LR2 datasheet(10/22 Pages) FREESCALE

10 / 22 page

Sensors

Freescale Semiconductor

MMA7450L

BASIC CONNECTIONS

Pin Descriptions

Figure 14. Pinout Description

Recommended PCB Layout for Interfacing

Accelerometer to Microcontroller

Figure 15. I2C Connection to MCU

Figure 16. SPI Connection to MCU

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.

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

DVDD_IO

Digital power supply for I/O pads

3, 10,

No Connection or connect to GND

IADDR0

I2C Address bit 0 (optional)

2, 5

GND

Ground

AVDD

Analog power supply (main power supply)

7CS

SPI enable, I2C/SPI mode selection

(1:12C, 0:SPI enabled)

INT1/DRDY

Interrupt1 / Data Ready

INT2

Interrupt2

SDO

SPI Serial Data Output

SDA/SDI/

SDO

I2C Serial Data (SDA), SPI Serial Data

Input (SDI), 3-wire interface Serial Data

Output (SDO)

SCL/SPC

I2C Serial Clock (SCL), SPI Serial Clock

(SPC)

AVdd

GND

DVdd_IO

INT1/DRDY

INT2

N/C

SDO

SDA/SDI/SDO

N/C

GND

Top View

100uF

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