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MMA8450Q - Low-power, 12-Bit, 3-Axis Accelerometer

MMA8450Q iconThe MMA8450Q accelerometer is an intelligent low power and noise, 3 x 3 x 1 mm capacitive micromachined accelerometer featuring 12 bits of resolution. This accelerometer is packed with many flexible user programmable embedded functions that are available with two configurable interrupt pins.

MMA8450Q has user selectable full scales of ±2g/±4g/±8g and it is capable of measuring accelerations with an Output Data Rate (ODR) of 400 Hz, 200 Hz, 100 Hz, 50 Hz, 12.5 Hz, and 1.563 Hz. These output data rates correspond to sample intervals from 2.5 ms to 640 ms.

The device can be configured to generate inertial wake-up interrupt signals when a programmable acceleration threshold is crossed on any one of the three sensed axes. Acceleration and time thresholds of interrupt generators are programmable by the end user.

MMA8450Q is available in a plastic QFN package and it is guaranteed to operate over the extended temperature range of -40...+85°C.

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
  • 400 µg/vHz 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 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
  • 10,000 g 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
MMA8450Q bd
Freescale Logo 4c

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