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NPN for usb reset — Parallax Forums

NPN for usb reset

electric550electric550 Posts: 122
edited 2009-06-02 03:42 in Propeller 1
I was wondering if someone knew the part number for the NPN that controls reset trough USB. I am looking at BCR108W. Would this work?

Comments

  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2009-06-02 02:57
    That's a so-called "digital transistor" which includes the biasing resistors, but it should work fine with a capacitively-coupled input. You won't need any external resistors with it.

    -Phil
  • electric550electric550 Posts: 122
    edited 2009-06-02 03:27
    Maybe the FJX2222A? I am making a PCB and I would like to put the USB on the board directly.
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2009-06-02 03:42
    Yeah, that would work, too. It's just a general-purpose NPN without the internal bias resistors, so you'll have to add resistance externally. Check out the Parallax schematics. If you're going to include USB on the board directly, take a look at this thread and follow the links to avoid the troubles that others have had.

    -Phil
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