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Absolute Encoder P2Serial Conversion Question

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Sedat-G

Sedat-G

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Hello Guys,

Is there any loss on accurency of read signal from an absolute encoder if I use a parallel2serial conversion IC ? Can anyone have experience on this?
 

If you have an absolute encoder providing parallel output data lines, which you then serialize, then there will be no accuracy lost if the interface design is done properly.

Key is to latch/store the output data into a serial shift register and then clock the data out. Otherwize the encoder data would change during readout and you will get wrong results(the encoder is an asynchronous sub-system, which need to be sychronized).

Another option is to use an encoder which has a serial interface, like SSI or BiSS. Here you find more application data to encoder interfacing: https://www.ichaus.de/whitepapers

Enjoy your design work!
 

Hi Sedat,

I also think you will not loose accuracy with a parallel to serial conversion if it is done correct.
An other option is to direct connect an serial encoder with SSI (Synchronous Serial Interface) to your
Micro controller. The SSI interface is a common standard and I found an application note how to interface
SSI encoders with microcontrollers :

http://www.posital.sg/sg/tech/download.php?teamName=posital&resource=%2Fsg%2Fproducts%2FPOSITAL%2FAbsoluteEncoders_Context%2FAbsoluteEncoders_Context_Technology_SSI_AppNote.pdf&productname=SSI+-+Synchronous+Serial+Interface+&docname=SSI+Master+Interface+Application+Note&lang=sg

It evene includes source code for usart and a non uart based implementation.

Regards CWA
 

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