Automotive Signal Processing

New Class of Accelerometers Enables Faster and Smarter Airbag Deployment

The fact that both minor vehicle collisions and more serious collisions have the same rate of initial deceleration makes it difficult to adapt an airbag system to different crash scenarios. Additional information is required about behavior of the vehicle during a crash event to improve overall driver safety.

For faster and more precise airbag deployment, ADI's ADXL950 iMEMS® dual spectrum accelerometer is the only MEMS accelerometer that provides a vibration detection path in addition to the traditional inertial sensing path. By capturing the shape and magnitude of high frequency vibration caused by the car's body panels and structure as they deform under impact, airbag systems are better equipped to recognize the severity of an accident.

The ADXL950's accelerometer channel (ACC) outputs baseband acceleration with a minimum full-scale range of ±70 g. This channel can measure static and dynamic acceleration with a 400 Hz, 2-pole Bessel, low-pass filtered output. The high frequency channel (HF) will output a measurement of energy in a high frequency band between 3 kHz and 22 kHz, and capture the shape and magnitude of high frequency vibration. The ADXL950 integrates a full electromechanical self-test feature to complete the signal chain.

The new ADXL950 iMEMS dual spectrum accelerometer is the first to add vibration detection data to inertial data and underscores ADI's investment in the automotive market. Contact ADI for pricing.


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