Evaluation of the two sensors is performed by the new 26-bit encoder signal processor iC-TW29 with integrated EEPROM. The sine/cosine signals from the XMR sensor are processed in the chip, interpolated, and output with an arbitrarily selectable single-turn resolution. The iC-PVL provides battery-backed multiturn position to the iC-TW29 via its Absolute Data Interface (ADI). This combination can be used to make a magnetic multiturn serial absolute encoder. For example, a BiSS encoder with an angular resolution of 17 bits and 24 revolution counting bits is possible. Signal processing time is only 5 µs, which is very close to that of optical encoders. Simultaneously, Auto Calibration in the iC-TW29 corrects the sine/cosine signal errors ensuring high measurement accuracy over temperature or with axial play of the motor shaft. Position output via SPI or incremental quadrature signals with index at any arbitrary resolution (FlexCount) from 1 to 32,768 CPR is also possible. Requiring a single-sided supply of +3.3 V, the sensors as well as the iC-TW29 operate over an industrial operating temperature range of –40 to +125°C. The iC-TW29 comes in 5x5mm 32-pin QFN package.
iC-Haus – www.ichaus.de