Motion Sensor Enables Smarter Vehicle Electronics
STMicroelectronics has introduced a motion sensor providing accurate measurements of vehicle movement for systems such as adaptive front lights, auto-levelling HID (high-intensity discharge) lamps, inertial brake lights, e-parking brake, advanced anti-theft systems and control of vehicle dynamics. The AIS226DS is a two-axis in-plane accelerometer capable of greater accuracy than is possible using two individual sensors, the company asserts. The device senses acceleration up to ±6 g, where one ‘g’ is the acceleration due to gravity. As an example, 3 g is the approximate acceleration experienced in a manned rocket during launch into space. The AIS226DS can also resolve incredibly tiny angles of incline, smaller than 0.02°. The ability to accurately measure incline is important in auto-leveling lamp, e-parking brake, and HSA (Hill Start Aid) applications. Motion is sensed using a tiny MEMS motion detector built on a silicon chip. An interface chip, available with an SPI or I2C output, is also integrated, enabling direct connection to the vehicle’s Electronic Control Unit (ECU).