AS5045 Rotary Encoder IC

12-bit Absolute Magnetic Rotary Encoder with SSI and PWM Output incl. Diagnostic Functions

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Description

The AS5045 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 0.0875° = 4,096 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 1 µs/step or 2 µs/step (244Hz or 122Hz PWM frequency).

An internal voltage regulator allows the AS5045 to operate at either 3.3V or 5.0V supplies.

Key Features

360° contactless high resolution angular position encoding
2 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 Z-axis
Serial read-out of multiple interconnected AS5045 devices using daisy chain mode
Mode input for optimizing noise vs. speed
Wide temperature range: -40°C to 125°C
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