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Rotary position sensing

Description

The AS5145 is a contact less magnetic rotary encoder for accurate angular measurement over a full turn of 360 degrees.

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 can be placed above or below the IC.

The absolute angle measurement provides instant indication of the magnet’s angular position with a resolution of 0.0879º = 4096 positions per revolution. 

This digital data is available as a serial bit stream and as a PWM signal.

An internal voltage regulator allows the AS5145 to operate at either 3.3V or 5V supplies.

 Features

Contact less high resolution rotational position encoding over a full turn of 360 degrees

Two digital 12-bit absolute outputs:

• Serial interface - Pulse width modulated (PWM) output

• Three incremental outputs

• Quadrature A/B/I (10 or 12 bit) and Index output signal (preprogrammed versions available AS5145A for 10-bit 

 and AS5145B for 12-bit) Red-Yellow-Green indicators display placement of magnet in Zaxis

Serial read-out of multiple interconnected AS5145 devices using Daisy Chain mode .User programmable zero position 

Failure detection mode for magnet placement, monitoring, and loss of power supply .

Tolerant to magnet misalignment and gap variations .Small Pb-free package: SSOP 16 (5.3mm x 6.2mm)

Applications

The device is ideal for industrial applications like contactless rotary position sensing and robotics; automotive applications like steering wheel position sensing, transmission gearbox encoder, head light position control, torque sensing, valve position sensing and replacement of high end potentiometers.