AM512B encoder

General description

The AM512B is a compact solution for angular position sensing. The IC senses the angular position of a permanent magnet placed above the chip. The permanent magnet must be diametrically polarized and of cylindrical shape.
The AM512B uses Hall sensor technology to detect the magnetic flux density distribution at the surface of the silicon. Hall sensors are placed in a circular array around the center of the IC and deliver a voltage representation of the magnetic field distribution.
The sine and cosine voltage outputs from the sensor array vary with magnet position. The sine and cosine signals are then converted to absolute angle position with a fast nine bit flash interpolator.
The absolute angle position value from the interpolator is output either through a parallel binary interface, a serial SSI interface or a linear voltage output. The relative changes of the angle position are also output as incremental A QUAD B encoder signals. The resolution of incremental output is 512 counts per turn.

Features

 Contactless angular position encoding over 360°
 Ideal for harsh environments due to magnetic sensing
 Complete system-on-chip solution
 9 bit absolute encoder
 Output options:
 Incremental
 Parallel
 Serial SSI
 Analogue linear
 Factory optimized linearity
 High rotational speed up to 30,000 rpm
 5 V power supply
 Low power consumption. 20 mA typical.
 Extended operating temperature range (-40 °C to +125 °C)
 SMD package LQFP44
 RoHS compliant (lead free)

Applications

Non-contact position or velocity measurements:
 Motor motion control
 Flow measurement
 Robotics
 Camera positioning
 Front panel switches
 Workshop equipment
 Mobility aids
 Potentiometer replacement