Multi-output magnetic position sensor adds BLDC-optimised signalling

For 8.5-bit (360 steps per revolution) rotary-position sensing at speeds up to 30,000rpm, the AS5134 from austriamicrosystems operates with a simple two-pole magnet and produces absolute angular measurements in either PWM or serial format.

The device’s serial output is compatible with two-wire or three-wire bus standards, and measurements can be taken over a full 360° turn. The sensor can also be programmed from one to six pole pairs and three programmable incremental-output modes are available. One of these delivers a three-phase commutation signal optimised for Brushless DC (BLDC) motors, enabling improved performance and easier design.

In addition to the angle information, the AS5134 is also able to indicate the strength of the magnetic field as a 6-bit code. As a further benefit, the AS5134’s power-saving design combines a sub-1.5mA power-down mode with 250µs start-up time and fast measurement cycles to minimise overall energy consumption.

The AS5134 is qualified to AEC-Q100 for use in automotive applications such as power steering or motor-driven systems. Hall-sensing elements, the analogue front end and digital signal processing are all integrated, and a software-programmable zero position simplifies assembly by saving mechanical alignment of the magnet. Sensitivity is also user programmable.

 

FEATURES Complete system on chip No angle calibration required 9-bit multi-turn counter Magnetic field-strength range: 20mT to 80mT Operating temperature range: -40°C to 140°C

APPLICATIONS Industrial BLDC drives Positioning systems Rotary switches

 

 

 

 

• International Rectifier’s IRS233x, page 081003
• Avago Technologies’ ACPL-C78x, page 081015

 

austriamicrosystems / AS5134