Magnetic off-axis absolute position encoder

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MU2S 30-32N

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iC-MU is an all-in-one, off-axis, magnetic position sensor featuring integrated Hall sensors with automatic signal conditioning and processing. The nonius scanning of two magnetic tracks (a master and a nonius track) is evaluated by two real-time-tracking sine-to-digital converters. Following power up and nonius computation, iC-MU provides incremental encoder quadrature signals with an index of any count up to 65,536 CPR and an output at an adjustable minimum edge distance. It also gives the absolute singleturn position with up to 18 bits per revolution through various serial interfaces (SSI, BiSS, SPI).

Commutation signals for brushless motors with up to 16 pole pairs are derived from the absolute position and supplied through a 3-pin interface. The commutation starting angle can be preset. External counters can be supplied with pulse signals for cw and ccw or for step and direction.

iC-MU captures full revolutions with its embedded 24-bit period counter and can thus supplement the position data output for data lengths of up to 38 bits. Optionally, using the multiturn interface the counter can be loaded following a reset by an external multiturn sensor, for instance. The data is read and synchronized with the internal position data, and is cyclically checked during operation. A preset function permits the adjustment of the absolute position after encoder installation.

iC-Haus MU_001


• Non-contact position measurement
• Linear scales and rotary encoders
• Motion control, motor feedback

Besides 2-track nonius computation iC-MU is capable of extending the rotary or linear absolute position using 3-track nonius computation. A second iC-MU can be connected up and evaluated using the multiturn interface. In doing so, the length of the absolute position measurement can be extended.

Besides its automatic signal conditioning functions iC-MU features manual compensation of the sine/cosine signal offsets and phase errors for both channels, allowing it to cope with magnet errors and encoder assembly inaccuracies.

Upon cycling power iC-MU loads its CRC-protected setup from the external EEPROM connected up to the I²C interface. Alternatively, using the SPI or BiSS C interface the device can be configured and operated by an external microcontroller.

Symmetry Electronics (and its e-commerce division: is an authorized iC-Haus distributor.


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Two-track Hall sensor scanning for 1.28 mm pole width
Precise signal conditioning for offset, amplitude, and phase
Synchronous 12-bit sine-to-digital conversion per track
Nonius computation of absolute position with up to 18 bits
16, 32, or 64 pole pairs per measurement distance
Linear speed to 16 m/s, rotational speed to 24,000 RPM
Position data output via fast serial interfaces (SPI, SSI, BiSS C)
Incremental encoder quadrature outputs (A, B, Z)
FlexCount resolution for 1 to 65536 CPR
Motor commutation signals for up to 16 pole pairs (U, V, W)
Counter signals and sin/cos signals optionally available
Serial multiturn interface up to 18 bits
Position preset function
Device setup via SPI, BiSS C or IC from external EEPROM
Operational temperature range of 40C to 110C
Small 16-pin DFN Package of 5 mm x 5 mm
Magnetic targets available (rotary / linear)

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