Product category: Analogue and Mixed Signal ICs
News Release from: iC-Haus | Subject: Magnets provide robust encoder
Edited by the Electronicstalk Editorial Team on 8 May 2007
Magnets provide robust encoder
iC-Haus' iC-MH is a system-on-chip solution for magnetic sensor applications with very small space requirements
The iC-MH is a system-on-chip solution for magnetic sensor applications with very small space requirements. In combination with a diametric magnetised permanent magnet this represents a robust absolute and incremental encoder. The tiny 5mm x 5mm QFN28 package contains the integrated Hall sensors with signal amplifier and gain control, two A/D convertors for incremental (ABZ, 12-bit) and commutation signals (UVW), integrated RS-422 line drivers and the serial BiSS/SSI-interface.
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Typical applications include fast motor control; position control/sensing; speed control; absolute rotating angle measurement; digital potentiometer; or replacement of resolver or optical encoder.
The angle resolution is programmable up to 4096 steps per turn.
The output edge rate of 8MHz can support motor speed up to 120,000rev/min.
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The commutation signals UVW are available to drive motors with two and four poles.
The ABZ and UVW outputs are configurable RS-422 line drivers to adapt for different line lengths and transmission speeds.
For data transfer an additional bidirectional, or synchronous serial BiSS/SSI-interface is integrated as well.
The programmable configuration, such as resolution, hysteresis, edge distance, zero-position of the ABZ and UVW signals and the rotating direction can be set over the BiSS-interface.
The configuration is programmed into the on-chip nonvolatile OTP-ROM.
The automatic gain control compensates variation in the Hall signal strength caused by temperature or magnet distance changes.
A magnet field outside of the specified 20 to 100kA/m generates an error signal for diagnosis purpose.
The iC-MH operates with a +5V (+/-10%) supply voltage in an ambient temperature range of -40 to +125C.
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