News Release

iC-MH8: fast, universal 12-bit encoder IC for BLDC motor control 03.11.2011
One-chip UVW commutation for 2-pole, 4-pole, and 8-pole DC motors
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iC-MH8 is a large-scale integrated systems solution for magnetic sensor applications in fast motor control units. Combined with a diametrically magnetized permanent magnet, the tiny device (QFN28 5x5 package) can be used to create a robust, universal encoder for motor commutation and positioning. The chip includes a Hall sensor array with signal amplification control, two interpolators for incremental (ABZ, 12-bit) and commutation (UVW) signals, differential sine/cosine outputs
(1 Vpp to 100 Ω), integrated RS422 line drivers, and a serial SSI/BiSS interface.

iC-MH8 is typically used in industrial, automotive, and medical 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 substitute resolvers or optical absolute encoders.

The angle resolution can be programmed in up to 4,096 steps per revolution. With an ABZ incremental signal output edge rate of 8 MHz, speeds of up to 120,000 rpm can be recorded. 360,000 rpm can be obtained with a resolution of 10 bits.
UVW commutation is 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 Ω. The sine/cosine, ABZ, and UVW outputs have been implemented as configurable RS422 line drivers, enabling the device to be perfectly adapted to suit various line lengths and transmission rates.
A bidirectional or synchronous serial SSI/BiSS-C interface is also integrated for data output. The resolution, hysteresis, edge distance, zero position of the ABZ and UVW signals, and direction of rotation for iC-MH8 can also be configured through BiSS-C. These settings can be permanently stored in an OTP-ROM.
An automatic gain regulator compensates for variations in the Hall sensor signals due to fluctuations in the ambient temperature or changes in distance to the magnet.
iC-MH8 operates on a supply voltage of +5 V (10%) within an operating temperature range of -40 to +125C.
Product iC-MH8
Press Release iC-MH8 (PDF) (213 kb)
Presseinformation iC-MH8 (PDF) (213 kb)
 
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