Encoders enable true 3 axis differential measurement of the magnetic field
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austriamicrosystems has unveiled the AS540x product family of 3dimensional Hall encoders at electronica. The element has been designed to provide 'absolute and highest resolution' with angular or linear output data.
According to austriamicrosystems, the new flexibility enables new solutions with improved performance for industrial and automotive applications. The AS540x series was developed in cooperation with Fraunhofer Institute for Integrated Circuits IIS in Germany.
The series uses two 'pixel-cells' in a differential mode to provide robustness against external influences like magnetic stray fields. In addition, the IC contains an eeprom to allow freedom when programming and linearising the IC.
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 AS540x magnetic encoder series is operational over an ambient temperature range from -40 up to 150°C and operates either up to 18V for the automotive or 3V supply voltage for the industry applications. The range will be available in a small lead free TSSOP package.
Marcel Urban, product manager Magnetic Encoders at austriamicrosystems, said: "The strength of this technology is the true 3d measurement of magnetic field components. Accurately calibrated lateral and vertical Hall sensors are used to increase the overall performance. By using two 3d pixels cells in a differential measurement approach, the absolute linear position measurement range is extended to 40mm."
The first 3D Hall product AS5401 for industrial applications will be launched in Q1 / 2011, samples of the automotive version with implemented high voltage diagnostic features will be available soon.
