Allegro MicroSystems AAS33001 Precision Angle Sensor ICs

Allegro MicroSystems AAS33001 Precision Angle Sensor ICs offer a 360° angle and contactless high-resolution angular position information based on magnetic circular vertical Hall (CVH) technology. The system-on-chip (SoC) architecture includes a CVH front end, digital signal processing to calculate the angular position information, and multiple output formats: serial protocol (SPI), pulse-width modulation (PWM), and either motor commutation (UVW) or encoder outputs (A, B, I). Additionally, the AAS33001 includes on-chip EEPROM technology, capable of supporting up to 100 read/write cycles for flexible programming of calibration parameters.

The Allegro MicroSystems AAS33001 Precision Angle Sensor ICs are intended for automotive applications requiring 0° to 360° angle measurements, including electronic power steering (EPS) and electronic power braking (EPB or IDB), transmission actuators, and BLDC pumps.

The AAS33001 supports on-chip 32 segment linearization, used to calibrate errors due to misalignment between the magnet and the sensor or imperfect magnetization of the target magnet (which can present itself as a misalignment of the magnet to the sensor). Furthermore, the device employs customer integration into safety-critical applications.

The AAS33001 is housed in a dual-die 24-pin eTSSOP or a single-die 14-pin TSSOP package that is lead (Pb) free with 100% matte-tin lead frame plating. The 1mm thin package reduces the minimum air gap between the CVH transducer and the target magnet.

Features

Contactless 0° to 360° angle sensor IC, for an angular position, rotational speed, and direction measurement
- Capable of sensing magnet rotational speeds targeting 12.5-bit effective resolution with 300 G field; higher effective resolution possible at higher field strengths
- Circular Vertical Hall (CVH) technology provides a single channel sensor system, with air gap independence
On-chip 32 segment linearization to improve angle accuracy
- Reduces the impact of magnet to sensor misalignment
- Reduces the impact of imperfect magnetization of a target magnet
Developed as a Safety Element out of Context (SEooC) in accordance with ISO 26262:2011 requirements for hardware product development for use in safety-critical applications

High diagnostic coverage
- On-chip diagnostics include logic built-in self-test (LBIST), signal path diagnostics, and watchdogs to support safety-critical applications
- 4-bit CRC on SPI
On-chip EEPROM for storing factory and custom calibration parameters
- Single-bit error correction; dual-bit error detection, error correction control (ECC)
Supports operating in harsh conditions required for automotive and industrial applications, including direct connection to 12V battery
- Operating temperature range from -40°C to 150°C
- Operating supply voltage range from 3.7V to 18V, the absolute maximum of 28V continuous
  - Can support ISO 7637-2 Pulse 5b up to 39V

Allegro MicroSystems AAS33001 Precision Angle Sensor ICs

Features

Magnetic Circuit & IC Diagram

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