MMA8451QR1 Sensors, Transducers

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1. Describe

The MMA8451QR1 is a smart, low-power, three-axis, capacitive, micromachined accelerometer with 14 bits of resolution. This accelerometer is packed with embedded functions with flexible user programmable options, configurable to two interrupt pins. Embedded interrupt functions allow for overall power savings relieving the host processor from continuously polling data. There is access to both low-pass filtered data as well as high-pass filtered data, which minimizes the data analysis required for jolt detection and faster transitions. The device can be configured to generate inertial wakeup interrupt signals from any combination of the configurable embedded functions allowing the MMA8451Q to monitor events and remain in a low-power mode during periods of inactivity. The MMA8451Q is available in a 16-pin QFN, 3 mm x 3 mm x 1 mm package.

2. Features

    1. 1.95 V to 3.6 V supply voltage

    2. 1.6 V to 3.6 V interface voltage

    3. ±2 g/±4 g/±8 g dynamically selectable full scale

    4. Output data rates (ODR) from 1.56 Hz to 800 Hz

    5. 99 μg/√Hz noise

    6. 14-bit and 8-bit digital output

    7. I2C digital output interface

    8. Two programmable interrupt pins for seven interrupt sources

    9. Three embedded channels of motion detection

        - Freefall or motion detection: one channel

        - Pulse detection: one channel

        - Jolt detection: one channel

  10. Orientation (portrait/landscape) detection with programmable hysteresis

  11. Automatic ODR change for auto-wake and return to sleep

  12. 32-sample FIFO

  13. High-pass filter data available per sample and through the FIFO

  14. Self-test

  15. Current consumption: 6 μA to 165 μA

3. Applications

    1. E-compass applications

    2. Static orientation detection 

    3. Notebook, e-reader, and laptop tumble and freefall detection

    4. Real-time orientation detection 

    5. Real-time activity analysis 

    6. Motion detection for portable product power saving 

    7. Shock and vibration monitoring

    8. User interface 

4. Pin configuration

5. Pin Description

6. Feature

    1. 8-bit or 14-bit data, high-pass filtered data, 8-bit or 14-bit configurable 32-sample FIFO

    2. Four different oversampling options to trade off resolution and current consumption depending on the application Require

    3. Additional low noise mode that operates independently of oversampling mode for higher resolution

    4. Low power and auto wake/sleep modes for saving current consumption

    5. Single/double click on a channel with direction information

    6. One channel for motion detection or free fall with orientation information

    7. High-pass filter based transient/jump detection and configurable thresholds for detecting the aforementioned acceleration changes 

    8. Threshold one channel with orientation information

    9. Flexible user-configurable portrait and landscape detection algorithms to address many use cases for screen orientation