austriamicrosystems has launched the "3D HallinOne" Magnetic Encoder family, AS540x, -which enables the "first true 3-axis" differential measurement of the magnetic field to cover absolute linear, off/on-axis and three dimensional tilt sensor applications. The new three-dimensional Hall element is claimed to be able to provide absolute and high resolution with angular or linear output data. This new flexibility is also claimed to enable new solutions with improved performance for industrial and automotive applications. The AS540x series was developed in cooperation with the Fraunhofer Institute for Integrated Circuits IIS in Germany, which is the licence holder of the HallinOne technology.
The encoder series uses two "pixel-cells" in a differential mode to provide robustness against all possible external influences such as magnetic stray fields, claims the company. In addition, the IC contains an EEPROM, which imparts flexibility to system designers concerning programming and linearisation of the IC.
Calibrated lateral and vertical Hall sensors are used to increase the overall performance. The differential approach by using two 3D pixels cells also extends the absolute linear position measurement range up to 40mm.
By using a two pole magnet, the absolute position information of the magnet is directly accessible over a SPI interface for module or as a PWM interface for remote applications. The series is operational over an ambient temperature range from -40 to 150°C and operates either up to 18V for the automotive or 3V supply voltage for the industry version. The family will be available in a lead-free TSSOP package. The company is developing a portfolio of 3D Hall products for automotive and industrial applications. The first 3D Hall product AS5401 for industrial applications will be launched in first-quarter 2011.
