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

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A1335 Datasheet
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Description

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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
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Part Number Specifications and Availability

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

A1334 Angle Sensor Integrated Circuit Package Image

Packaging

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.

LE Package Documentation

Design Support Tools

A1335 Programming Manual

A1335 Hardware User Guide

ASEK-20 Sensor Evaluation Kit

A1335 Software

A1335 Programming Board Schematics

Design Resources

Application Note

Advanced Programming with ASEK DLLs Harmonic Linearization

This application note describes the functions and the process flow the customer can use if the Allegro-provided software is not flexible enough or if custom software is to be used.

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Application Note

Guidelines for Using Allegro Angular Sensors

Many applications in different industries, such as in industrial automation and automotive sensors and actuators, require monitoring the angle of a rotating shaft either in an on-axis or off-axis arrangement. This application note is dedicated to a review of on-axis magnetic applications.

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Application Note

Advanced On-Chip Linearization in the A1335 Angle Sensor IC 

Numerous applications in industries—spanning from industrial automation and robotics, to electronic power steering and motor position sensing—require monitoring the angle of a rotating shaft either in an on-axis or off-axis arrangement.

Learn More

Application Note

Slide By Sensing for Long Stroke applications using Allegro Angle Sensors

This application note is a guide through the design process for using angle sensor ICs for linear position sensing, including magnet choice and orientation, output linearization, and using sensor IC arrays for extending the measurement range.

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Application Note

Applying Harmonic Compensation to the A1335 Output Signal using On-Chip EEPROM and Allegro Applications Software

This application note will provide a step-by-step example for configuring harmonic output signal linearization using the A1335 angle sensor integrated circuit (IC). This example will make use of the Allegro A1335 Samples Programmer software, compatible with either the ASEK-20 or ASEK-21 programmer ...

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Application Note

Microcontroller-Based Linearization of Angular Sensor ICs

AN296160 - Magnetic angle sensors are often a good choice for fast, reliable, contactless measurement of the angular position of a system, especially in dirty environments where optical encoders may not be a good fit.

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Guide

Allegro Product Selection Guide

Sense. Regulate. Drive. Check out our device offerings and packages across all of our product families in this PDF selection guide.

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Featured Third Party Boards and Tools


PWR Meter 3 Demo Board

Angle click is a precise Hall-effect angle sensing click board that can be used to measure the rotational angle of the magnetic field in the X-Y plane above it (parallel to the surface of the click), through the whole range of 360°.


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