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5
Functionality
The MMA8452Q is a low-power, digital output 3-axis linear accelerometer with a I 2 C interface and embedded logic used to
detect events and notify an external microprocessor over interrupt lines. The functionality includes the following:
? 8-bit or 12-bit data which includes High-Pass Filtered data
? 4 different oversampling options for compromising between resolution and current consumption based on application
requirements
? Additional Low-Noise mode that functions independently of the Oversampling modes for higher resolution
? Low Power and Auto-WAKE/SLEEP modes for conservation of current consumption
? Single-/Double-pulse with directional information 1 channel
? Motion detection with directional information or Freefall 1 channel
? Transient detection based on a high-pass filter and settable threshold for detecting the change in acceleration above a
threshold with directional information 1 channel
? Portrait/Landscape detection with trip points fixed at 30° and 60° for smooth transitions between orientations.
All functionality is available in 2g, 4g or 8g dynamic ranges. There are many configuration settings for enabling all the different
functions. Separate application notes have been provided to help configure the device for each embedded functionality.
Table 8. Features of the MMA845xQ devices
Feature List
Digital Resolution (Bits)
Digital Sensitivity (Counts/g)
Data-Ready Interrupt
Single-Pulse Interrupt
Double-Pulse Interrupt
Directional-Pulse Interrupt
Auto-WAKE
Auto-SLEEP
Freefall Interrupt
32 Level FIFO
High-Pass Filter
Low-Pass Filter
Orientation Detection Portrait/Landscape = 30°, Landscape to Portrait = 60°,
and Fixed 45° Threshold
Programmable Orientation Detection
Motion Interrupt with Direction
Transient Detection with High-Pass Filter
Low Power Mode
MMA8451
14
4096
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
MMA8452
12
1024
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
No
Yes
Yes
Yes
MMA8453
10
256
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
No
Yes
Yes
Yes
MMA8452Q
Sensors
Freescale Semiconductor, Inc.
11
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