AS5145

Description

The AS5145 is a contactless magnetic rotary encoder for accurate angular measurement over a full turn of 360°. It is a system-on-chip, combining integrated Hall elements, analog front end and digital signal processing in a single device. To measure the angle, only a simple 2-pole magnet, rotating over the center of the chip, is required. The magnet may be placed above or below the IC. The absolute angle measurement provides instant indication of the magnet's angular position with a resolution of 0.0879° = 4096 postitions per revoloution. This digital data is available as a serial bit stream and as a PWM signal. An internal voltage regulator allows the AS5145 to oContaperate at either 3.3V or 5V supplies.

Key Features

• Contactless high resolution rotational position encoding over a full turn of 360°
• 2 digital 12-bit absolute outputs:
  • serial interface and
  • Pulse Width Modulated (PWM) outputs
• 3 incremental outputs
• Quadrature A/B (10 or 12 bit) and Index output signal
• User programmable zero position
• Failure detection mode for magnet placement monitoring and loss of power supply
• "red-yellow-green"indicators display placement of magnet in Z-axis
• Serial read-out of multiple interconnected AS5145 devices using Daisy Chain mode
• Tolerant to magnet misalignment and arigap variations
• Wide temperature range: -40°C to + 150°C
• Fully automotive AEC-Q100 qualified, grade 0
• Small Pb-free package: SSOP16 (5.3mm x 6.2mm)

Applications

• Industrial applications:
  • Contactless rotary position sensing
  • Robotics
• Automotive application:
  • Steering wheel position sensing
  • Transmission gearbox encoder
  • Headlight position control
  • Torque sensing
  • Valve position sensing
• Replacement of high end potentiometers
• Low jitter incremental 10-bit encoder
• High resolution incremental encoder

Block Diagram