Angle Sensor IC with SPI and SENT Outputs

A1337

The A1337 provides contactless angle measurements with advanced diagnostics for safety-critical applications. Supports SPI and SENT interfaces, integrated turns counter, low-power modes, and flexible configuration options.

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Packaging

Contactless 0° to 360° angle sensor IC, for angular position and rotation direction measurement
- Circular Vertical Hall (CVH) technology provides a single-channel sensor system, with air gap independence
12-bit resolution possible in Low RPM mode, 10-bit resolution in High RPM mode
Angle Refresh Rate (output rate) configurable between 25 and 3200 μs through EEPROM programming
- Capable of sensing magnetic rotational speeds up to 7600 rpm, and up to 30,000 rpm with reduced accuracy
SPI, and SENT (Single Edge Nibble Transmission) or PWM (Pulse-Width Modulation)*
SPI interface provides a robust communication protocol for fast angle readings*
- SENT output supports four modes: SAEJ2716 (JAN2010) and Allegro proprietary options of Triggered SENT (TSENT), Sequential SENT (SSENT), and Addressable SENT (ASENT)*
- Programmable via Manchester Encoding on the VCC line, reducing external wiring*
- SPI and SENT interfaces allows use of multiple independent sensors for applications requiring redundancy*
Advanced diagnostics to support safety-critical applications, including:
- On-chip, user-controlled logic built-in self-test (LBIST) and signal path diagnostics
- 4-bit CRC on SPI messages
- User-Programmable Missing Magnet Error flag for notifying controller of low magnetic field level
Diagnostics are initiated over the SPI or SENT interface and can directly test proper operation of the IC in safety-critical applications
Integrated Turns Counter tracks magnet rotation in CW/CCW direction from –1280 to +1280 counts, even when vehicle is in key-off state
- Count updates are user-selectable to be every 180° or every 45° degree of magnet rotation
- WAKE pin for external wake-up trigger can be used to automatically detect motion > 100 rpm
Low-Power Mode enables direct connection to vehicle battery
- User-programmable duty cycle optimizes low-power mode current consumption (typically 85 μA per die)
- Ultralow-power Transport mode
EEPROM with Error Correction Control (ECC) configuration, sensor calibration including end-of line adjustments like programmable angle reference (0°) position and rotation direction (CW or CCW)
Available in both single-die and dual-die configurations
- Dual-die devices contain two independent die housed within a single package
Absolute maximum VCC of 26.5 V for increased robustness and direct connection to automotive vehicle battery

* See Selection Guide for more details.

The A1337 is available in a single-die 14-pin TSSOP and a dual-die 24-pin TSSOP. Both packages are lead (Pb) free with 100% mattetin leadframe plating.

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Documentation and Resources

Documentation

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All Types Application Note

Documents Found: 4

Document Type	Document Name
Application Note	Microcontroller-Based Linearization of Angular Sensor ICs
Application Note	A1337/A1338 System Timing
Application Note	Guidelines for Using Allegro Angular Sensors
Application Note	Low-Power and Turns-Count Sensing with the A1337 Angle Sensor IC

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All Types Hardware Kit or Board User Guide

Documents Found: 2

Document Type	Document Name
Hardware Kit or Board	ASEK-20 Sensor Evaluation Kit
User Guide	A1337 Hardware (User Guide)

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