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high res miniature optical encoder - ChipEncoder

Discussion in 'Electronic Design' started by Glenn, Jun 25, 2004.

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  1. Glenn

    Glenn Guest

    Has anyone used the ChipEncoder from MicroEsys?

    Do you know if there is anyone making assembled rotary
    encoder modules with this chip?

    Can a standard quadrature decode chip like the LS7266 be
    used with this chip? It has up to 40x interpolation for very
    high pulse counts, but the index pulse seems to be longer
    than a single pulse, so I'm not sure how the zero-ing would
    work on the LS7266.

    Any thoughts welcome... I haven't found any other mfr that
    has such high resolution in such a small package at a
    reasonable price.

  2. Paul Burke

    Paul Burke Guest

    No, but it looks more usable than their interpolating chipset at $300 a go.
    If it gives a quadrature output within the frequency capabilities of the
    LS7266, no reason why not. Some interpolators output in bursts as they
    update the position, be careful of maximum output rate.
    You have to zero one one direction of approach only.
    You might consider the IC-NQ sinewave interpolator from IC-Haus:


    with a standard sine/ cosine output encoder- up to 8096x, and includes a
    24 bit counter, but that amount of interpolation is obviously only
    useful if your encoder's output is sound enough.

    Paul Burke
  3. Zorknob

    Zorknob Guest

    I don't know how it'll work with the LS7266, because I've always done
    my own decoding in FPGA or CPLD, but it looks like standard
    sin/cos/index to me.

    As far as the index goes: the step resolution is 1uM per count whereas
    the index resolution is 40uM, so if you did your own decoder, you
    could look for the index edges to precisely find home.

    Of course, this assumes that you have a motion system that can obtain
    that kind of positioning accuracy so getting the index to the gnats
    nuts matters.
  4. Glenn

    Glenn Guest

    I'm not sure that there is a provision in the LS7266 to zero
    the counter on the edge from one direction only - but a
    reset routine could be setup manually with a microcontroller
    checking the direction.

    Do you have any pointers to manufacturers of miniature
    sin/cos encoders?

    Do they tend to cost more that optical encoders?
    I've only seen some very expensive encoders usually coupled
    with micro motors.


  5. Paul Burke

    Paul Burke Guest

    Glenn wrote:

    They are optical, but the output isn't squared off. There are a lot
    about: here's one supplier in the UK:

    Paul Burke
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