AS5045 12-bit programmable magnetic rotary encoder AS5045.pdf

Description

The AS5045 is a contactless magnetic rotary encoder for accurate angular measurement over a full turn of 360¡ã. 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 two-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 0.0875¡ã = 4096 positions per revolution. This digital data is available as a serial bit stream and as a PWM signal.

The PWM pulse width is programmable for 1µs/step or 2µs/step.(244Hz or 122Hz PWM frequency).

An internal voltage regulator allows the AS5045 to operate at either 3.3 V or 5 V supplies.

Key Features

• 360¡ã contactless high resolution angular position encoding
• Two digital 12-bit absolute outputs:
  • Serial interface and
  • Programmable Pulse Width Modulated (PWM) output
• User programmable zero position
• Failure detection mode for magnet placement monitoring and loss of power supply
• Push button functionality detects movement of magnet in Zaxis
• Serial read-out of multiple interconnected AS5045 devices using daisy chain mode
• Mode input for optimizing noise vs. speed
• Wide temperature range: - 40¡ãC to + 125¡ãC
• Small package: SSOP 16 (5.3mm x 6.2mm)

Benefits

• Complete system-on-chip
• Flexible system solution provides absolute output, with serial data and PWM output
• Ideal for applications in harsh environments due to magnetic sensing principle
• High reliability due to non-contact sensing
• Robust system, tolerant to misalignment, airgap variations, temperature variations and external magnetic fields