Monday, April 6, 2009

9 Bit Magnetic Rotary Encoder ICs

Angular magnetic encoder IC

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

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.

- Contactless angular position encoding over 360°
- Ideal for harsh environments due to magnetic
- 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)

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