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Chapter 2 Introduction
The MMA955xL three-axis accelerometer is a member of Freescale’s Xtrinsic family of intelligent sensor
platforms. This device incorporates dedicated accelerometer MEMS transducers, signal conditioning, data
conversion and a 32-bit, programmable microcontroller.
This unique blend transforms Freescale’s MMA955xL device into an intelligent, high-precision
motion-sensing platform able to manage multiple sensor inputs and make system-level decisions required
for sophisticated applications such as gesture recognition, tilt computation, and pedometer functionality.
The MMA955xL platform is programmed and configured with CodeWarrior Development Studio
software. This integrated-design environment enables customers to quickly and easily shape and
implement custom algorithms and features to exactly match their application needs.
Using its master I 2 C module, the MMA955xL platform can manage secondary sensors such as pressure
sensors, magnetometers or gyroscopes. This allows sensor initialization, calibration, data compensation
and computation functions to be off-loaded from the system application processor. Multiple sensor inputs
can be easily consolidated by the MMA955xL device which acts as an intelligent sensing hub and highly
configurable decision engine. Total system power consumption is significantly reduced as the application
processor stays powered down until absolutely needed.
INT_O
Control
I 2 C slave
SCL0
SDA0
INTC
SPI slave
RESET
CLKGEN
INT
BDM BKGD
and SCLK
mailbox SDI
SDO
SSB
Analog Front End ( (AFE) )
SCL0/RGPIO0/SCLK
SDA0/RGPIO1/SDI
DBG
X
axis
Y
axis
Z
axis
Temp
RGPIO2/SCL1/SDO
V 1
ColdFire Core
with MAC
1 K x 32
ADC
C to V
Sensor
AN0
AN1
RGPIO3/SDA1/SSB
RGPIO4/INT
RGPIO5/PDB_A/INT_O
RGPIO6/AN0/TPMCH0
ROM
4 K x 32
Flash
512 x 32
I 2 C Master
Programmable
delay block
SCL1
SCL0
PDB_A
PDB_B
RGPIO7/AN1/TPMCH1
RGPIO8/PDB_B
BKGD/MS/RPGPIO9
V DD
RAM
Two-channel, 16-bit TPMCH0
Timer / PWM module TPMCH1
V SS
V SS
16-bit
Modulo timer module
V DDA
V SSA
Figure 2-1. Platform block diagram
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
21
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