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interface Propeller<-->LVTTL — Parallax Forums

interface Propeller<-->LVTTL

nicolad76nicolad76 Posts: 164
edited 2008-01-06 13:43 in Propeller 1
Hi all,
I guess I needhelp...I put mself in trouble hop.gif
I have just bought a Prop to realize my first project and I have realized it is far harder than I have thought.
While I have no problem in programming, this is the first timeI attempt to realize some hw. I have a driver for display I would liketo use with my Prop. I should I build the electric interface?????
Where can I get info? I posted the info I have...I hope somebody could help me.....
I believe you guys have better to do but a small hint would be very appreciated.
Thanks!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Post Edited (nicolad76) : 1/5/2008 11:38:43 PM GMT
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Comments

  • deSilvadeSilva Posts: 2,967
    edited 2008-01-05 23:37
    It would be even more helpful when you post a link directly to the datasheet, so we can find weak spots that you might not consider worthwhile mentioning.

    At first glance this is perfect companion to the Propeller; just connect the 14 relevant datalines to the Propeller I/Os.
    Most likely some can even be connectetd to a static level later.
    It looks quite similar to a KS0108, for which drivers exist, I think..
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2008-01-05 23:57
    I'm guessing a module that includes a Philips Apollo E-ink display controller...

    -Phil
  • nicolad76nicolad76 Posts: 164
    edited 2008-01-06 02:34
    Hi guys.....thanks for replying...

    It is actually a driver for E-Ink display but unfortunately I cannot post links to the original document since it is not on-line and, well, otehr reason [noparse]:)[/noparse].....

    My doubt is about the phisycal interface between the Prop and the driver...I guess I cannot just connect pin to pin directly......

    What kind of interface do you think I should build?????
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2008-01-06 02:56
    Assuming the other chip/module is powered from 3.3V, I don't know why you couldn't just connect pin-to-pin. If the other chip's Vdd is less than 3.3V, then series resistors to limit the diode protection current to 1mA or less would be called for. (The datasheet says 10mA max, but that's really high.)

    -Phil

    Addendum: On any lines that can be outputs from the other chip, it's always best to add a least a 330-ohm series resistor to protect against bus conflicts from an errant Propeller program.

    Post Edited (Phil Pilgrim (PhiPi)) : 1/6/2008 3:04:12 AM GMT
  • deSilvadeSilva Posts: 2,967
    edited 2008-01-06 03:27
    nicolad76 said...
    My doubt is about the phisycal interface between the Prop and the driver...I guess I cannot just connect pin to pin directly...... What kind of interface do you think I should build?????

    @Nicolad76: I do not understand this... Though you are not the only one...
    I told you in my upper posting to just connect those damn lines!
    O.k. You need not believe me and wait for more people to say the same....

    But just posting this question again ".. I guess, I cannot..." This is, well, not very polite...
    Why do you guess this? Is it "Although deSilva said "Do it", I guess, I cannot..."?

    Sorry for being rude, but I want to be rude now smile.gif

    Phil is very cautious, but unneccessarily so, I should say,,,

    @Phil: The protection diodes will care for 0.6V
  • nicolad76nicolad76 Posts: 164
    edited 2008-01-06 03:47
    Hey hey hey...I was not asking the same question again, I just wanted to make sure I understood correctly before I destroy the driver...it is the only one I have and it cost a lot of money shocked.gif .....

    I didn't mean to be unpolite, probably I should have studied english at school (I'm italian, country where people usually speaks only italian....·) a little bit more since I did not realiaze I could be offensive...
    ...afterall I am just starting now with this toy...it is normal to "guess"...

    Well guys...I'll let you know how fast I will destroy the whole thing....and thanks for the...well....hint

    Ciao

    smilewinkgrin.gif
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2008-01-06 03:53
    deSilva said...
    @Phil: The protection diodes will care for 0.6V
    That's almost always the case, but the datasheet I referred to said 0.3V. Germanium/Schottky diodes? Who knows? In any event, an abundance of caution seemed called for.

    -Phil

    P.S. deSilva, do you ever sleep? What time is it there?
  • AleAle Posts: 2,363
    edited 2008-01-06 08:04
    To be on the safe side, use some 220 or 330 ohm resistors in series between the prop pins and the lcd.
    deSilva is probably 3 people one over here, one in Oz or Japan and one in the Americas smile.gif
  • deSilvadeSilva Posts: 2,967
    edited 2008-01-06 09:15
    That COULD be an explanation for a lot of oddities... smile.gif
  • nicolad76nicolad76 Posts: 164
    edited 2008-01-06 13:43
    Good morning everyone!!! Thanks a lot from wherever you are....including Oz.. [noparse]:)[/noparse]
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