AMR-based angle sensors offer unmatched accuracy

June 19, 2019 //By Christoph Hammerschmidt
AMR-based angle sensors offer unmatched accuracy
Infineon has designed its new Xensiv TLE5109A16 AMR (Anisotropic Magneto Reistive) angle sensors for very precise, fast and cost-effective angle measurements. Typical applications in automotive and industrial environments include position measurement in brushless DC motors (BLDC) for pumps, wipers or brakes, position sensing for valves, flaps or pedals, and angle measurement in steering systems.

The devices are designed for 180° angle measurements, but can also be used for 360° measurements in motors with an even number of pole pairs. The angle sensors cover a wide range of magnetic fields - from 10 mT to more than 500 mT.

An advantage of the AMR technology is the very high accuracy, with typical angular errors of 0.1 degrees. Especially with weak magnetic fields between 10 and 20 mT, where the angular errors usually increase significantly, the XENSIV TLE5109A16 products exceed available solutions and achieve angular errors of only 0.2 degrees. This allows system designers to realize cost-effective solutions because they can use less powerful and therefore less expensive magnets.

The sensors are available in single and dual chip versions, the latter enabling functional safety according to ASIL D. Infineon offers the sensors with two power supply options: 3.3V and 5V. The short response time of the new sensors from 40 to 70 µs is below that of comparable solutions on the market. In addition, the sensors can be used for extremely fast applications with more than 30,000 revolutions per minute.

Infineon's AMR-based TLE5109A16 family complements the GMR (Giant Magneto-Resistive)-based TLE5009A16 and various TLE5309D products from the same manufacturer. Thanks to the identical pin assignment and interfaces of all XENSIV TLE5x09 sensors in the TDSO-16 package, users can switch to a different product or version without any major design effort.


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