A1334: Precision Hall-Effect Angle Sensor IC

This part is in production but has been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Date of status change: July 2, 2018. Deadline for receipt of LAST TIME BUY orders: December 1, 2018.

Recommended Substitutions: A1338 Family. For existing customer transition, and for new customers or new applications, contact Allegro Sales.

The A1334 is a 360° angle sensor IC that provides contactless high-resolution angular position information based on magnetic Circular Vertical Hall (CVH) technology. It has a system-on-chip (SoC) architecture that includes: a CVH front end, digital signal processing, and a digital (SPI) output. The A1334 is ideal for automotive applications requiring high-speed 0° to 360° angle measurements, such as electronic power steering (EPS) and throttle systems.

The A1334 supports a Low RPM mode for slower rate applications and a High RPM mode for high-speed applications. High RPM mode is for applications that require higher refresh rates to minimize error due to latency. Low RPM mode is for applications that require higher resolution operating at lower angular velocities.

As part of its signal processing functions, the A1334 includes automotive-grade temperature compensation to provide accurate output over the full operating temperature and voltage ranges. The A1334 also includes EEPROM technology for end-of-line calibration.

The A1334 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.

• Contactless 0° to 360° angle sensor IC, for angular position, rotational speed, and direction measurement
• Available with either a single die or dual independent die housed within a single package
• 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 magnet rotational speeds in excess of 7600 rpm
• SPI interface allows use of multiple independent sensors for applications requiring redundancy
• EEPROM programmable angle reference (0°) position and rotation direction (CW or CCW)
• Absolute maximum V_CC of 26.5 V for automotive battery-powered applications