Overview: Data sheet ® AM256D01_13 Issue 13, 22th May 2017 AM256 – angular magnetic encoder IC The AM256 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 AM256 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. signals. The resolution of incremental ●● Contactless angular position output is selectable between 128 and encoding over 360° 256 counts per turn with an external pin. ●● Ideal for harsh environments due to magnetic sensing With its compact size the AM256 angular magnetic encoder is especially ●● Complete system-on-chip suitable for different applications, solution including motor motion control, flow measurement, robotics, camera ●● 8 bit absolute encoder positioning, front panel switches, ●● Factory optimized linearity workshop equipment, mobility aids etc.
Output options: • Incremental • Parallel ●● High rotational speed up to 60,000 rpm
●● 5 V power supply • Serial SSI • Analogue sinusoidal ●● Low power consumption. 13 mA typical. 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 eight bit flash interpolator. ●● Extended operating temperature range (–40 °C to +125 °C)
●● SMD package SSOP28
●● RoHS compliant (lead free) - see Declaration of conformity The absolute angle position value from the interpolator is output through a parallel binary interface or a serial SSI interface.
