Data Sheet

Sensors
Freescale Semiconductor 3
MMA8452Q
Application Notes for Reference
The following is a list of Freescale Application Notes written for the MMA8451, 2, 3Q:
• AN4068, Embedded Orientation Detection Using the MMA8451, 2, 3Q
• AN4069, Offset Calibration of the MMA8451, 2, 3Q
• AN4070, Motion and Freefall Detection Using the MMA8451, 2, 3Q
• AN4071, High Pass Data and Functions Using the MMA8451, 2,3Q
• AN4072, MMA8451, 2, 3Q Single/Double and Directional Tap Detection
• AN4073, Using the 32 Sample First In First Out (FIFO) in the MMA8451Q
• AN4074, Auto-Wake/Sleep Using the MMA8451, 2, 3Q
• AN4075, How Many Bits are Enough? The Trade-off Between High Resolution and Low Power Using Oversampling Modes
• AN4076, Data Manipulation and Basic Settings of the MMA8451, 2, 3Q
• AN4077, MMA8451, 2, 3Q Design Checklist and Board Mounting Guidelines
1 Block Diagram and Pin Description
Figure 1. Block Diagram
Figure 2. Direction of the Detectable Accelerations
12-bit
SDA
SCL
I
2
C
Embedded
DSP
Functions
C to V
Internal
OSC
Clock
GEN
ADC
Converter
VDDIO
VSS
X-axis
Transducer
Y-axis
Transducer
Z-axis
Transducer
Freefall
and Motion
Detection
Transient
Detection
(i.e., fast motion,
jolt)
Orientation with
Set Hysteresis
and Z-lockout
Shake Detection
through
Motion
Threshold
Single, Double
Auto-WAKE/Auto-SLEEP Configurable with debounce counter and multiple motion interrupts for control
Auto-WAKE/SLEEP
ACTIVE Mode
SLEEP
VDD
& Directional Tap
Detection
INT1
INT2
MODE Options
Low Power
Low Noise + Power
High Resolution
Normal
MODE Options
Low Power
Low Noise + Power
High Resolution
Normal
ACTIVE Mode
WAKE
1
DIRECTION OF THE
DETECTABLE ACCELERATIONS
(BOTTOM VIEW)
5
9
13
X
Y
Z
1
(TOP VIEW)
Earth Gravity