Analysis

Position sensor IC features 360° contactless programmable angle

4th April 2016
Jordan Mulcare

The A1335 from Allegro MicroSystems Europe is a new 360° contactless high-resolution programmable magnetic angle position sensor IC designed for use in digital systems in automotive and related applications involving rotating shaft sensing.

The device has a System-on-Chip (SoC) architecture with a front end based on circular vertical Hall technology and programmable microprocessor-based signal processing. It supports multiple communication interfaces including I2C, SPI (Serial Peripheral Interface), and SENT (Single Edge Nibble Transmission).

In addition to providing 360° angular measurement, the A1335 also provides two options for on-chip linearisation: harmonic linearisation to handle applications that require side-shaft magnetic configurations; and segmented linearisation for scaling angle measurement applications requiring less than 360° of motion (so-called “short stroke” applications). It also includes on-chip EEPROM technology, capable of supporting up to 100 read/write cycles, for flexible programming of calibration parameters.

In addition to the advanced output linearisation algorithms, other digital signal processing functions include temperature compensation and gain/offset trim, helping to provide an extremely accurate and linear output for both end-of-shaft applications and challenging off-axis or side-shaft applications.

The A1335 is suitable for automotive applications requiring high-speed 360° angle measurements, such as electronic power steering, transmission, torsion bar, and other systems that require accurate measurement of angles. The A1335 is available as a single die in a 14-pin TSSOP package or a dual die in a 24-pin TSSOP package. Both packages are lead (Pb) free with 100% matt-tin leadframe plating.

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