Newsgroups: comp.robotics
Path: brunix!cat.cis.Brown.EDU!noc.near.net!ns.draper.com!news.draper.com!surname.draper.com!dfyler
From: dfyler@draper.com (Don Fyler)
Subject: Re: How to convert Inc. to Abs. motor incoding?
Message-ID: <dfyler.3.000DE5E2@draper.com>
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Date: Wed, 10 Aug 1994 18:53:47 GMT

jms@wolverine.utias.utoronto.ca (John Mark Shewchun) writes:



>        I was wondering if there is any pre-packaged electronics
>that allows you to convert the signal from an incremental motor
>encoder into absolute encoding. ie. take the square wave pulse from
>an incremental encoder and use the leading edges to create a 16-bit
>digital count.
>
>        Any help would be greatly appreciated.


Hewlett Packard makes four chips that I know of that interface a  
quadrature encoder to an 8-bit bus:
     HTCL-2000    12 bit counter, 16 pin chip.
     HTCL-2016    16 bit counter, 16 pin chip.
     HTCL-2020    16-bit counter plus pulse up and down outputs, 20 pin.
     HTCL-1100    general purpose stepper/servo control chip with
                  16? bit counter.
Call them at 1-800-752-0900. I know Newark Electonics sells them.

IXYS Corp. makes the IXSE502 which has
an only 8 bit counter but interfaces very cleanly to a microprocessor
and works in a way that any size counter can easily be generated in
software.  They can be reached at (408)435-1900.

Several companies make boards for PCs and Macs that read encoders but 
it has always been cheaper (in my experience) to buy a servo board and 
just use the encoder reading capability.


These opinions are my own.                    Don Fyler




