Allegro MicroSystems A33022 Hall-Effect Angle Sensor ICs
Allegro Microsystems A33022 Hall-Effect Angle Sensor ICs are 360° angle sensors that provide contactless, high-resolution angular position information via magnetic sensing. The A33022 has a system-on-chip (SoC) architecture that includes angle sensing, digital signal processing, and various output options: serial peripheral interface (SPI), pulse width modulation (PWM), or single edge nibble transmission (SENT). Also integrated in the device is on-chip EEPROM technology capable of supporting a high number of read/write cycles, for flexible end-of-line programming of calibration parameters.
The low 25µs latency of the A33022 makes it ideal for automotive applications requiring fast 0° to 360° angle measurements, such as electronic power steering (EPS), seatbelt motor systems, transmission actuators, shift-by-wire systems, electronic braking systems, and throttle systems. The A33022 is developed as a Safety Element out of Context (SEooC) in accordance with ISO 26262 requirements for hardware product development for use in safety-critical applications.
The Allegro Microsystems A33022 also includes integrated linearization features. This feature allows the A33022 to correct for misalignment between the IC and the target magnet with minimal added latency. The A33022 is available in a single-die 14-pin TSSOP package and a dual-die 24-pin eTSSOP package. The packages are lead (Pb) free with 100% matte tin leadframe plating.
Features
- Contactless 0° to 360° angle sensor IC, for angular position, rotational speed, and direction measurement
- Hall-effect technology
- End of shaft
- Stray field immune
- 11.2-bits noise-free resolution with 300G field and 12.5kHz bandwidth
- Default 25µs latency with 12.5kHz bandwidth (BW) with BW programmable from 3.125kHz to 50kHz
- Designed to meet ASIL D Top Level Safety Requirements in a single- or dual-die package, when used in conjunction with appropriate system-level control
- Wide operating voltage (3.7V to 18V) enables direct connection to the vehicle battery
- Linearization to reduce the error from misalignment between the sensor and the target magnet
- SPI interface allows the use of multiple independent sensors for applications requiring redundancy
- 5-bit cyclic redundancy check (CRC) on SPI messages
- SENT output is SAEJ716 JAN2016 compliant with Allegro proprietary enhancements
- Customer programmable tick times down to 0.5µs
- Shared SENT allows multiple ICs to share a common SENT line
- Configurable SENT output with 12-bit or 16-bit magnetic data
- EEPROM with error correction control (ECC) for trimming calibration
- EEPROM programmable angle reference (0°) position and rotation direction (clockwise or counterclockwise)
- AEC-Q100 Grade 0 qualified
- Wide -40°C to +150°C operating temperature range
Applications
- Steer-by-wire
- Electrohydraulic
- Electromechanical
- Electronic power steering
- 2W-xEV power
Functional Block Diagram
Development Tool
Allegro MicroSystems ASEK-30 Sensor Programmer
This programmer is an interface between a PC and an Allegro sensor IC.