Accelerometer Sensors MMA3201

Friday, March 21st, 2014 - Sensors/Tranducer

The MMA3200 series of dual axis (X and Y) silicon capacitive, micromachined accelerometers features signal conditioning, a 4-pole low pass filter and temperature compensation, and separate outputs for the two axes. Zero-g offset full scale span and filter cut-off are factory set and require no external devices. A full system self-test capability verifies system functionality.

Standart Aplication Accelerometer Sensors MMA3201

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Features Accelerometer Sensors MMA3201

  • Sensitivity in two separate axes: 40g X-axis and 40g Y-axis
  • Integral Signal Conditioning
  • Linear Output
  • Ratiometric Performance
  • 4th Order Bessel Filter Preserves Pulse Shape Integrity
  • Calibrated Self-test
  • Low Voltage Detect, Clock Monitor, and EPROM Parity Check Status
  • Transducer Hermetically Sealed at Wafer Level for Superior Reliability
  • Robust Design, High Shocks Survivability

The sensor provides a self-test feature that allows the verification of the mechanical and electrical integrity of the accelerometer at any time before or after installation. This feature is critical in applications such as automotive airbag systems where system integrity must be ensured over the life of the vehicle. A fourth “plate” is used in the g-cell as a self-test plate. When the user applies a logic high input to the self-test pin, a calibrated potential is applied across the self-test plate and the moveable plate. The resulting electrostatic force (Fe = 1/2 AV2/d2) causes the center plate to deflect. The resultant deflection is measured by the accelerometer’s control ASIC and a proportional output voltage results. This procedure assures that both the mechanical (g-cell) and electronic sections of the accelerometer are functioning.

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