Circuits

National Semiconductor Parametric Catalog
Microchip Human Interface Solution

  • Output pins can be driven in three different modes:
    • open drain??? - a transistor connects to low and nothing else
    • open drain, with pull-up - a transistor connects to low, and a resistor connects to high
    • push-pull - a transistor connects to high, and a transistor connects to low (only one is operated at a time)
  • Ground Loop
    • Shielded cable
      • The common method to wire shielded cables is to ground only the source end of the shield to avoid ground loops.
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