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Magnetic angle sensor packs protection features

Posted: 31 May 2010     Print Version  Bookmark and Share

Keywords:angle sensor  Hall elements  analogue front end 

AS5165 sensor

austriamicrosystems debuts a contactless magnetic angle position sensor that offers protection features for reliable operation in harsh automotive environments and includes a SENT J2716 interface for simple transmission of high-resolution sensor information.

The new high-resolution magnetic rotary sensor delivers accurate angular measurement over a full 360°.

The AS5165 magnetic encoder combines integrated Hall elements, analogue front-end, digital signal processing, and automotive protection features—all in a single device. Offering the most reliable performance available, the AS5165 provides protection for the power supply and output pins against over-voltage up to 27V; power supply pins are also protected against reverse polarity to -18V. In addition, continuous short circuit detection and broken wire detection are provided, and a unique patented fully differential architecture makes the sensor insensitive to stray magnetic fields. Automotive applications for the AS5165 include throttle and valve position sensing and several power train sensing applications.

To measure an angle, only a simple two-pole magnet rotating over the centre of the chip is required. The magnet may be placed above or below the IC. The AS5165 is tolerant of magnet misalignment, air gap variations, and temperature variations. No calibration is required because of the device's inherent accuracy. The absolute angle measurement provides instant indication of the magnet's angular position with a programmable resolution of 0.022° = 16384 positions per revolution.

The AS5165 is AEC-Q100 grade 0 qualified, comes in a TSSOP14 package, and operates from a +5V supply over a -40°C to +150°C temperature range.

- Christoph Hammerschmidt
Automotive DesignLine

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