360° programmable magnetic angle position sensor

December 22, 2015 // By Graham Prophet
A1335 from Allegro MicroSystems Europe is a 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. It is available as single or dual independent die in a single package.

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 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 accurate and linear output for both end-of-shaft applications and challenging off-axis or side-shaft applications.

The A1335 is intended 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. It comes as a single die in a 14-pin TSSOP package or dual dice in a 24-pin TSSOP package.

Allegro MicroSystems; www.allegromicro.com