Thursday, July 18, 2024

Evaluation Board for Magnetic On-Axis Serial Absolute Multiturn Encoder

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  • Built in combination with an XMR sensor and a Hall sensor
  • Signal processing done using iC-TW29

iC-Haus introduces a new evaluation board, PVL3M that provides an XMR sensor (AMR angle sensor AA746C from Sensitec) in combination with the multiturn Hall sensor iC-PVL for on-axis absolute angle measurement and revolution counting.

The two sensors are evaluated with the help of the new 26-bit encoder signal processor iC-TW29 with an integrated EEPROM. The sine/cosine signals from the XMR sensor are processed in the chip, interpolated and result in an output that has an arbitrarily selectable single-turn resolution.

Signal processing via iC-TW29

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 instance, 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 an axial play of the motor shaft.

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Position output via SPI or incremental quadrature signals with an 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 degrees Celsius to +125 degrees Celsius.

As for external circuitry, only a few components are required; typically just a voltage regulator and a transceiver for data communication (BiSS/SSI) are needed.

The iC-TW29 is housed in a space-saving 32-pin QFN package which requires only 5 mm x 5 mm on the PCB. For sampling purposes, ready-to-use demo boards (which can also serve as programming adapters) and a PC operating program (GUI) are available.


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