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What pin is the Vdd pin on the 40 pin DIP Prop — Parallax Forums

What pin is the Vdd pin on the 40 pin DIP Prop

SONIC the HedgehogSONIC the Hedgehog Posts: 321
edited 2012-01-23 08:53 in General Discussion
So I got my my Propeller education kit a few weeks ago. I understand it great, and I even read over the data sheet. But the only problem I found was that, while the schematic for the demo board is extremely helpful, it uses a quad flat lead package, not dual inline. The part for adding the VGA output was fine, but I would like to add PS/2 mouse and keyboard support, but it says to connect the clock and data pins of the PS/2 output to Vdd, but I don't know what pin that is. And the different packages are supposed to have the same number of I/O pins. Could someone please help?

Comments

  • FranklinFranklin Posts: 4,747
    edited 2012-01-20 16:54
    VDD is the power pin for the chip. (not vin but 3.3v) there are two of them on the prop. You also need to use a resistor not connect directly to the pin, it's called 'pullup'
  • SONIC the HedgehogSONIC the Hedgehog Posts: 321
    edited 2012-01-20 17:27
    Ahh that helps a bunch. I thought it was some kind of special pin, but that clears things up alot, thanks!
  • SONIC the HedgehogSONIC the Hedgehog Posts: 321
    edited 2012-01-20 17:32
    Thanks a bunch, that helps. So all I need is a resistor, which I assume would be 10 ohms? And a connection that doesn't go strait from the pin? I think I understand now.
  • LeonLeon Posts: 7,620
    edited 2012-01-21 03:30
    Pull-ups are usually more like 4k7 to 10k.
  • doggiedocdoggiedoc Posts: 2,246
    edited 2012-01-21 04:23
    Is this the image you needed?

    prop_dip.png
  • Duane DegnDuane Degn Posts: 10,588
    edited 2012-01-21 08:09
    StH,

    I'm not sure what comes with the Propeller Education Kit, but the Propeller Education Kit (pdf) is available from the help window of the Propeller Tool.

    As Franklin pointed out, Vdd is 3.3V. When you connect something to Vdd, that doesn't mean you have to connect it to a Vdd pin on the Prop, it just needs to be connected to 3.3V on the breadboard (or some other source). Most of the pull-up resistors I've seen used with the Prop have been 10K Ohm (10,000 Ohm).

    Vss is ground.
  • Duane DegnDuane Degn Posts: 10,588
    edited 2012-01-22 16:59
    I saw in another thread you had concidered purchasing a Hydra system.

    I don't know if you know this or not by the Hydra manual is available as a pdf file from the Hydra product page.

    The manual has lots of great information about the Propeller especially about using the Props video capability.
  • SONIC the HedgehogSONIC the Hedgehog Posts: 321
    edited 2012-01-23 08:53
    Sorry, I meant to reply sooner, but my iPad closed down every time I went to this thread. Thanks for all the he guys.
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