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Introduction
2.1
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2.2
Hardware features
Three accelerometer operating ranges:
— ±2g: Suits most user-interaction (mouse) motions and free fall
— ±4g: Covers most regular human dynamics (walking, jogging)
— ±8g: Detects most abrupt activities (gaming)
Integrated temperature sensor
One slave SPI or I 2 C interface operates up to 2 MHz dedicated to communication with host
processor
One master I 2 C interface operates up to 400 kbps used to communicate with external sensors
10, 12, 14 and 16-bit ADC trimmed data formats available.
1.8V Supply voltage
32-bit ColdFire V1 CPU
Extensive set of power management features and low power modes.
Single Wire Background Debug Mode (BDM) pin interface
16 KB Flash memory
2 KB random access memory
ROM-based flash controller and slave port command line interpreter
Two channel timer with input capture, output capture or edge-aligned PWM
Programmable delay block for scheduling events relative to start of frame
Modulo timer for scheduling periodic events
Software features
This device may be programmed to provide any of the following:
? Orientation detection (portrait/landscape)
? High-g/low-g threshold detection
? Pulse detection (single, double and directional tap)
? Auto wake/sleep
? Linear and rotational free fall
? Flick detection
? Embedded smart FIFO
? Power management
? Pedometer
? Shock, vibration and sudden-motion detection
? Tilt-angle computation
The association of a high-performance accelerometer with a powerful, embedded ColdFire V1 MCU core
gives the possibility to grow and customize this list in an unprecedented way.
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
22
Freescale Semiconductor, Inc.
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