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Thread: Gecko G320 tech question

  1. #1
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    Thumbs down Gecko G320 tech question

    Can anybody tell me what the input capacitance value seen looking into the encoder inputs on a G320 drive will be?

    I am working on implementing the optical isolation I mentioned in my previous post on the G320 system and need an estimate of the input capacitance.

    The optocouplers I got have open collector inputs and I want to get an idea of the rise-times I will get with the resistor pullup I am using.

    Is the simple circuit shown in the version 7 of the manual a good enough approximation or is there an RC input filter on these pins that will kill me? What chip/circuit is it actually driving?

    Thanks,
    Bob


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    The input is as drawn; a 1K pull-up to 5VDC going directly into a CD4093 input. Call it 20pF when taking parasitics into account.

    Mariss


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    Gecko Technical Question

    Quote Originally Posted by Mariss Freimanis View Post
    The input is as drawn; a 1K pull-up to 5VDC going directly into a CD4093 input. Call it 20pF when taking parasitics into account.

    Mariss
    Thanks, that was just what I was hoping for!

    BobH


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