Peripheral-sensor accelerometers

  • 21-Dec-2010 08:44 EST


STMicroelectronics’ family of high-g acceleration sensors for advanced airbag systems are micro-machined devices that detect the rapid deceleration of the vehicle during a crash and send instant information to the airbag control unit. The AIS1xxxDS peripheral-sensor accelerometers provide single-axis in-plane motion sensing across five full-scale ranges from ±20 g up to ±400 g. An on-chip integrated circuit interface converts the deceleration data into a high-resolution digital bit stream that is transmitted with high reliability to a dedicated microcontroller chip through a standard distributed system interface protocol. Sophisticated algorithms evaluate the situation and decide whether or not to deploy the airbag within a few milliseconds. The sensing part of the airbag accelerometer is fabricated on ST’s 8-in (203-mm) MEMS (microelectromechanical systems) line. The electrical part benefits from the high level of integration and specific control of parasitic currents made possible by the Silicon-On-Insulator technology in ST’s Bipolar-CMOS-DMOS manufacturing process.

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