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MEMS vibration sensor cancels road noise

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By Peter Clarke


The AIS25BA is a MEMS vibration sensor optimized for road noise detection and use cancelling in the automotive cabin.

Manufactured by STMicroelectronics the three-axis accelerometer is engineered to prioritize RNC system accuracy. It offers 30µg/√Hz in X and Y axes and 50µg/√Hz in the Z axis.

The frequency response extends up to 2.2kHz and sensor latency is 266 microseconds leaving time to generate noise-cancellation signals in real-time.

In addition, the sensor has a time-division multiplex (TDM) digital interface that enables the system to synchronize the outputs from multiple accelerometers installed to measure vibrations throughout the vehicle. This audio-friendly interface also allows easy connection to other types of data buses widely adopted in automotive. The full-scale measurement range is selectable up to ±7.7g, giving plenty of margin with respect to the intense vibrations typical of the application. The supply-voltage range is 1.71V to 1.99V.

The AIS25BA is compliant with AEC-Q100 and is available in a 14-lead 2.5mm by 2.5mm by 0.86mm LGA package, priced from $3.90 for orders of 1000 pieces.

“In today’s digital age, canceling – not deadening – unwanted sounds is the smart way to ensure a quieter cabin for safer, more enjoyable journeys,” said Simone Ferri, of the marketing, Analog, MEMS and Sensors Group of STMicroelectronics. “With the transition to hybrid and electric vehicles, which can be strongly affected by road noise, our AIS25BA accelerometer delivers superior value for system designers.”

Related links and articles:

www.st.com

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