quadrature encoder interface
quadrature encoder interface
(OP)
Does anyone know of a readily available quadrature encoder interface IC capable of x1, x2, x4 counting? I have seen only one current manufacturer (LSI). Theirs is pretty expensive and I'm not sure about its availability. What I'm looking for will hopefully support 16-bit or more counter. The application is motor control. In the past, I was using a microcontroller with this feature built in. However, we are moving to an ARM microcontroller, and an external interface will be required.
Any thoughts?
Any thoughts?





RE: quadrature encoder interface
http://www.picservo.com/icproducts.html
http://ww
http://www.usdigital.com/products/lsi/index.shtml
RE: quadrature encoder interface
An ARM7 running at 66 MHz should be able to do lots of things besides decoding.
The reason this encoding technique is so fast is that it does not have to make lots of decisions. It just reads two pins, shifts and stores, adds and reads the table. That's all.
A 16-pin PALCE or similar is the next thing to use. You will probably not have any speed problems at all then.
Gunnar Englund
www.gke.org
RE: quadrature encoder interface
Also, thanks itsmoked. I'm trying to keep the encoder interface as inexpensive as possible. US-Digidal is a distributor for LSI.
RE: quadrature encoder interface
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If nothing else, most of us have used the data sheet to guide us in implementing the logic in a PLD. We currently use an Altera onboard programmable CPLD to implement an 8 channel encoder interface for up to a 10 MHz edge rate.
RE: quadrature encoder interface