Sensors

20

Freescale Semiconductor

MMA7456L

Figure 16. SPI Connection to MCU

NOTES:

1.

Use a 0.1

2.

Physical coupling distance of the accelerometer to the microcontroller should be minimal.

3.

PCB layout of power and ground should not couple power supply noise.

4.

Accelerometer and microcontroller should not be a high current path.

5.

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.

6.

Physical distance of the two GND pins (Pin2 and Pin5) tied together should be at the shortest distance.

GND

Vdd

Vdd_IO

SPC

SDA/SDI/SDO

SDO

INT2

INT1/DRDY

MCU

0.1uF

0.1uF

10uF

10uF

GND

Vdd

Vdd_IO

SPC

SDA/SDI/SDO

SDO

INT2

INT1/DRDY

MCU

0.1uF

0.1uF

10uF

10uF

VDD

VDD

SLC/SPC