Drive-control interface IC for sine/cosine encoders has integrated safety functions

Drive-control interface IC for sine/cosine encoders has integrated safety functions

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By eeNews Europe

A complete position sensor and encoder interface in a “system-on-chip” solution, intrinsically safe differential sine/cosine transmission of position information runs at signal frequencies of up to 500 kHz.

The circuitry contains serial and parallel MCU interfaces; a complete analogue front end for signal conditioning; a 13-bit sample and hold SAR tangent converter with a latency of 2 µsec; diagnostic functions for monitoring the sine/cosine signals in real time; and a a 1V output driver for a differential sin/cos output at 100Ω.

A combined singleturn/multiturn period counter with a length of up to 50 bit supports real time processing in the drive controller even at high sine/cosine signal input frequencies. Additional safety functions in the iC-MR monitor the sine/cosine input signal level, detect short-circuit and wire breakage, monitor the control range if supplying an external encoder LED or an MR sensor measuring bridge, monitor a motor temperature sensor, and finally secure the data transmission through a life counter as well as by an extended CRC generation. Measurement of the motor temperature, for example through a KTY sensing element, occurs through an adjustable 12-bit A/D converter featuring range monitoring and in that way, supports an active condition monitoring function through the drive controller.

For sensor-based applications, inside a magnetic or an optical encoder, differential or referenced sensor signals of a few millivolt upwards – generated by MR sensor bridges or photo sensors – for example, can be amplified and conditioned in offset, amplitude and phase. A regulated current output maintains the adjusted measuring accuracy during operation by readjusting the supply of the LED light source or the magnetic sensor bridge. Compensation of temperature and ageing effects occurs automatically, if necessary.

For digital encoder applications iC-MR has a BiSS/SSI interface and initialises itself through an external I²C EEPROM, or alternatively, the connected micro controller configures and controls the component via the serial SPI or the parallel 8-bit interface.

Typical applications for the iC-MR are:

  1. Interface module for the connection of sine/cosine encoders in drive controls and automation systems;
  2. Sine/cosine motor encoders with safety functions and condition monitoring for motors or complete drives;
  3. Optical or magnetic absolute position encoders with BiSS/SSI output or for field bus systems.

The iC-MR is supplied in a 48-pin 7 x 7 mm QFN package: it runs from +5V and is rated for operation from -40 to +110°C. A demo board is available, supplied and configured via USB from the PC; a component DLL is also available.


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