Re: Recommendations for a Quadrature Decoder IC or MicroController

On Tue, 29 Jul 2008 23:18:06 -0700 (PDT), benn <benn686@xxxxxxxxxxx>
wrote:

I have an atmega16 that interfaces to a motor with a quadrature
encoder sensor. Turns out the frequency of the pulses are much more
than my little 4Mhz can handle (the micro does other things as well!)
As a result, the motor control isn't very accurate, nor does it react
very fast.

SO.. I'm looking for either a quadrature decoder IC that can take the
load off (will calculate position/velocity and interface to a host
micro via serial/parallel bus), OR, a beefy microcontroller with built-
in decoders (and pwm output). 32-bit with lots of GPIO is ideal if
going the microcontroller route.


I had exactly the same problem a while ago - the quadrature output was
much faster than my micro could keep up with (even if it wasn't doing
anything else!).

I successfully used the Agilent (now Avago) HCTL-2022 decoder chip.
Very fast & accurate and no "gotchas" (from memory - ymmv).

Here's the URL for the data*** - good luck.

http://www.avagotech.com/assets/downloadDocument.do?id=1780&Source=SearchResultPage
.

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