pin types

Discussion in 'General Electronics Chat' started by kirayamato_143, May 28, 2011.

  1. kirayamato_143

    Thread Starter Member

    Jan 23, 2011
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    hello everyone i'm starting to make a new device in proteus,, can somebody tell me the differences between pin types? i cant classify no connection pin.. wether passive,input,output,bidirectional. etc. tnx
     
  2. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    Sounds like schematic capture. Pin types is an additional layer of protection when doing layouts. There is a set of rules in the program concerning which pin types can connect with other pin types.

    Example: Connecting an output to an input is fine, but you probably want to be told if you tie two outputs together.

    I do my work in Orcad capture, and for the most part I just define pins as passive or power, as I don't rely on this feature for checking.
     
  3. kirayamato_143

    Thread Starter Member

    Jan 23, 2011
    59
    0
    so what does it means to define a pin in passive? if i put a pin type in pull-up or pull-down then i cannot use it as power pins? i feel confuse thanks for your response
     
  4. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    It may generate a warning depending on the connection type matrix.

    POWER pin want to see a net with a POWER property. PULL-UP or -DOWN wants to see a net associated with a resistor (I assume). Thus connect the two together and a warning gets fired.

    It is designed to keep you from say putting power to an input, but if you want an input to always see a logic "1" you may well want to connect it to power.

    I've never had much use for this feature as I always track down and correct all my warnings or design rule errors. You may be able to override them but I prefer to get rid of them.
     
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