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.

Luminary, d*** and other chips have QEI interfaces. The Luminary ones
have some extra features for speed measurement, IIRC.

Many DSPs have them as well... motor control is one of those crossover
areas. LSI makes some stand-alone counter chips, or you could use a
CPLD or FPGA.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@xxxxxxxxxxxx Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
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