Angle Sensor IC with I²C, SPI, and SENT Interfaces


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The A1335 is a 360° contactless high-resolution programmable magnetic angle position sensor IC. It is designed for digital systems and is capable of communicating via an I2C, SPI, or SENT interface.

This system-on-chip (SoC) architecture includes a front end based on Circular Vertical Hall (CVH) technology, programmable microprocessor-based signal processing, and features an interface capable of supporting I2C, SPI, and SENT. Besides providing full-turn angular measurement, the A1335 also provides scaling for angle measurement applications less than 360°. It includes on-chip EEPROM technology, capable of supporting up to 100 read/write cycles, for flexible programming of calibration parameters.

Digital signal processing functions, including temperature compensation and gain/offset trim, as well as advanced output linearization algorithms, provide an extremely accurate and linear output for both end-of-shaft applications as well as off‑axis applications.

The A1335 is ideal for automotive applications requiring high-speed 360° angle measurements, such as: electronic power steering (EPS), transmission, torsion bar, and other systems that require accurate measurement of angles. The A1335 linearization schemes were designed with challenging off-axis applications in mind.

The A1335 is available as a single die in a 14-pin TSSOP, or dual die in a 24-pin TSSOP. Both packages are lead (Pb) free with 100% matte-tin leadframe plating.

  • 360° contactless high-resolution angle position sensor
  • CVH (Circular Vertical Hall) technology
  • Available with either a single die or dual independent die housed within a single package
  • Digital output format selectable among SPI, I2C, and SENT (Single-Edge Nibble Transmission)
  • SENT output is SAEJ2716 JAN2010 compliant, with Allegro proprietary enhanced programmable features
  • Customer-programmable SENT tick times, ranging from 0.5 to 7.9 μs
  • SPI interface allows use of multiple independent sensor ICs for applications requiring redundancy
  • Refresh rate: 32 μs, 12-bit resolution
  • Wide range of diagnostics enable automotive applications to achieve ASIL-D compliance
  • Programmable via Manchester encoding on the VCC line, reducing external wiring
  • Automotive temperature range: –40°C to 150°C
  • AEC-Q100 automotive qualified
  • Two types of linearization algorithms offered: harmonic linearization and segmented linearization
    • Enables off-axis operation
  • Programmable range—can scale 22.5° to full-scale digital output
  • Microprocessor-based output linearization
  • EEPROM with Error Correction Control (ECC) for trimming calibration
  • 1 mm thin (TSSOP) package
  • Improved air gap performance, based on continuous background calibration
  • Allegro Sensor Bias LDO

The A1335 is available as a single die in a 14-pin TSSOP, or dual die in a 24-pin TSSOP. Both packages are lead (Pb) free with 100% matte-tin leadframe plating.

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ASEK-20 Sensor Evaluation Kit
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A1335 Programming Manual
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A1335 Hardware User Guide

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