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MMA8450Q 3-軸加速計
發表時間:2012-11-05 10:41:43   發布作者:啟達

The Freescale Semiconductor MMA8450Q 3-axis digital accelerometer is a next generation motion sensing device that provides 12-bit digital output to accomplish complex gesture recognition and positive detection required for next-generation mobile applications that go beyond basic algorithms. The Freescale Semiconductor MMA8450Q 12-bit, 3-axis low g I²C digital capacitive acceleration sensor with extremely low power provides additional embedded intelligence such as orientation, tap, double tap, jolt, freefall, and shake detection. The Freescale Semiconductor MMA8450Q 3-axis accelerometer lets you develop more robust applications such as position detection, 3D gesture detection, pedometry, and many other next generation motion detection functions.

Freescale Semiconductor also offers the MMA7660FC 3-axis accelerometer.

Additional Embedded Intelligence

The MMA8450Q accelerometer provides additional embedded intelligence. Utilizing the embedded functions in the MMA8450Q allows development of more robust applications such as position detection, 3D gesture detection, pedometry and many other next generation motion detection functions.

Embedded functions/features:
  • Four channels of motion detection
    • Freefall or motion detection: 2 channels
    • Pulse detection: 1 channel
    • Transient detection: 1 channel
  • Orientation (Portrait / Landscape) detection with hysteresis compensation
  • Automatic ODR change for auto-wake-up and return-to-sleep
  • Self test
Features
  • 1.71 V to 1.89 V supply voltage
  • ±2g/±4g/±8g dynamically selectable full-scale
  • Output Data Rate (ODR) from 400 Hz to 1.563 Hz
  • 375 μg/√Hz noise at normal mode ODR = 400 Hz
  • 12-bit digital output
  • I²C digital output interface (operates up to 400 kHz Fast Mode)
  • Programmable 2 interrupt pins for 8 interrupt sources
  • Embedded 4 channels of motion detection
    - Freefall or motion detection: 2 channels
    - Pulse Detection: 1 channel
    - Transient (Jolt) Detection: 1 channel
  • Orientation (Portrait/Landscape) detection with hysteresis compensation
  • Automatic ODR change for auto-wake and return-to-sleep
  • 32 sample FIFO
  • Self-Test
  • 10,000g high shock survivability
  • RoHS compliant
Applications
  • Static orientation detection (portrait/landscape, up/down, left/right, back/
    front position identification)
  • Real-time orientation detection (virtual reality and gaming 3D user position feedback)
  • Real-time activity analysis (pedometer step counting, freefall drop detection for HDD, dead-reckoning GPS backup)
  • Motion detection for portable product power saving (auto-sleep and auto-wake for cell phone, PDA, GPS, gaming)
  • Shock and vibration monitoring (mechatronic compensation, shipping and warranty usage logging)
  • User interface (menu scrolling by orientation change, tap detection for button replacement


Block Diagram


Freescale Semiconductor MMA8450Q Pin Description

Detection Algorithms

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