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AS5247 Rotary Position Sensor

Redundant 14-Bit On-Axis Magnetic Rotary Position Sensor With 11-Bit Binary Incremental Pulse Count

The AS5247 is a high-resolution redundant rotary position sensor for fast absolute angle measurement over a full 360-degree range. This new position sensor is equipped with a revolutionary integrated dynamic angle error compensation (DAEC™) with almost 0 latency. The robust design of the device suppresses the influence of any homogenous external stray magnetic field. A standard 4-wire SPI serial interface allows a host microcontroller to read 14-bit absolute angle position data from the AS5247 and to program non-volatile settings without a dedicated programmer. Incremental movements are indicated on a set of ABI signals with a maximum resolution of 2048 steps / 512 pulses per revolution. The resolution of the ABI signal is programmable to 1024 steps / 256 pulses per revolution. Brushless DC (BLDC) motors are controlled through a standard UVW commutation interface with a programmable number of pole pairs from 1 to 7. The absolute angle position is also provided as PWM-encoded output signal. The AS5247 supports embedded self-diagnostics including magnetic field strength too high, magnetic field strength too low or lost magnet, and other related diagnostic features. The AS5247 is available as a dual die in a compact MLF-40 7x7 package.

AS5247 magnetic rotary position sensor block diagram

Key Features

  • DAECН Dynamic angle error compensation
  • 14-bit core resolution
  • Independent output interfaces: SPI, ABI, UVW, PWM
  • Zero position, configuration programmable
  • Self-Diagnostics and Redundancy
  • Immune to external stray field

Key Benefits

  • Easy to use – saving costs on DSP
  • Good resolution for motor & position control
  • Versatile choice of the interface
  • No programmer needed (via SPI command)
  • Supports safety challenging applications
  • Lower system costs (no shielding)

Applications

The AS5247 was designed to support BLDC motor commutation for the most challenging and safety-critical automotive applications (AEC-Q100 grade 0 automotive qualified) such as:

  • Electric power steering (EPS)
  • Transmission (gearbox, actuator)
  • Brake (actuator)
  • Alternator & Starter

AS5247 Product Facts

Resolution 14-bit / 11-bit
Interfaces SPI
Output ABI, UVW, PWM
Max speed [rpm] 14500
Overvoltage protection [ ]
Redundant Yes
Supply voltage [V] 3.3 or 5.0
Temperature range [°C] -40 to +150
Package MLF-40 7x7
Automotive qualified Yes