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Analogue switches - vaguely prop-related... — Parallax Forums

Analogue switches - vaguely prop-related...

HughHugh Posts: 362
edited 2013-02-18 12:09 in Propeller 1
I was thinking if driving some analogue switches from a prop. Thinking there must be a few junctions in them I tried to find out whether there was any voltage drop across such a switch (e.g., the 0.6 v that might be dropped over a diode). There doesn't seem to be any data on this as a parameter.

Am I being naive by thinking there might be a voltage drop?

Many thanks
Hugh

Comments

  • Duane C. JohnsonDuane C. Johnson Posts: 955
    edited 2013-02-18 06:37
    Which switch are you looking at.

    In general they don't have junctions.
    The switch is a form of FET, so no junction.

    In general they don't directly specify a voltage drop.
    The do specify an ON Resistance.
    Then it's up to you to calculate what the voltage drop will be given the current flowing through the switch.
    E=I*R

    Duane J
  • HughHugh Posts: 362
    edited 2013-02-18 12:09
    Thanks Duane - that's perfect!
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