A1335: Angle Sensor IC with I²C, SPI, and SENT Interfaces


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.

Top Features

  • 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

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
ASEK-1335-SUBKIT-T n/a -20°C to 85°C -- View Data Contact your
local sales rep
Distributor Stock
ASEK-1335-T-KIT n/a -20°C to 85°C -- View Data Contact your
local sales rep
Distributor Stock
A1335LLETR-DD-T 24-lead TSSOP -40°C to 150°C Yes View Data Contact your
local sales rep
Distributor Stock
A1335LLETR-T 14-lead TSSOP -40°C to 150°C Yes View Data Contact your
local sales rep
Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

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