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

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

Documentation and Resources

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All Types Application Note Selection Guide

Documents Found: 3

Document Type	Document Name
Application Note	Using the A1335 in a Short Stroke Application
Application Note	Advanced On-Chip Linearization in the A1335 Angle Sensor IC
Selection Guide	Allegro Product Selection Guide

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All Types Hardware Kit or Board User Guide

Documents Found: 3

Document Type	Document Name
Hardware Kit or Board	ASEK-20 Sensor Evaluation Kit
User Guide	A1335 Programming Manual
User Guide	A1335 Hardware User Guide

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