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12-Bit Encoder IC with Absolute, Incremental, and BLDC Motor Commutation SignalsThe iC-MH8 is a highly variable system on chip magnetic encoder device providing fast step response for motor control applications. Combined with a diametrically magnetized permanent magnet, this compact device (QFN28 5x5 package) can be used to create a vigorous, universal encoder with motor commutation and positioning interfaces. The highly integrated iC-MH8 includes a Hall sensor array with signal amplification control, incremental (ABZ) outputs, absolute position via serial SSI/BiSS interface, BLDC motor commutation (UVW) outputs, differential sine/cosine outputs  (1 Vpp to 100 ?), and integrated RS422 line driver outputs.

The iC-MH8 is typically used in industrial, automotive, and general motor control applications, such as:

  • Fast motor control with short sensor latencies
  • Fast position control in robots with safety requirements
  • Speed control of up to 120,000 rpm at a 12-bit resolution
  • Absolute detection/measurement of angles of rotation
  • As universal absolute encoders (with sine/cosine and SSI/BiSS options)
  • As substitutes for resolvers or optical absolute encoders.

The angle resolution can be programmed up to 4,096 steps (12-bit) per revolution, and with an ABZ incremental signal output edge rate of 8 MHz, speeds of up to 120,000 RPM can be realized. BLDC motor commutation is also available for 2-pole, 4-pole, or 8-pole DC motors. For safety applications, the differential sine/cosine outputs provide redundant capture and transmission of the angle position at 1 Vpp to 100 ?. The sine/cosine, ABZ, and UVW outputs have also been implemented as configurable RS422 line drivers enabling the device to suit various line lengths and transmission rates.

A bidirectional or synchronous serial SSI/BiSS-C interface is also integrated for absolute position data output. The resolution, hysteresis, edge distance, zero position of the ABZ and UVW signals, and direction of rotation for the iC-MH8 can be configured through the BiSS-C serial interface. These settings can then be permanently stored inside the iC-MH8 internal ROM.  An automatic gain regulator compensates for variations in the Hall sensor signals due to fluctuations in the ambient temperature or changes in distance from chip to magnet over the life of the application.

The iC-MH8 operates on a supply voltage of +5 V (±10%) within an operating temperature range of -40 to +125°C. Further information is available at http://www.ichaus.com/product/mh8.

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