LCD question

Discussion in 'Embedded Systems and Microcontrollers' started by houta69, Apr 2, 2010.

  1. houta69

    Thread Starter New Member

    Mar 8, 2009
    4
    0
    Hi All -

    I want to run this LCD at 3.3V but it's unclear to me what I should be doing with the Vee pin. Do I need to supply it a negative voltage or should it be generating a negative voltage that I feed to Vo from a pot?

    Any insight on how to hook this up would be appreciated.
     
  2. corsair

    Member

    Mar 6, 2010
    51
    1
    just found this somewhere else, hope its useful
     
  3. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    From the datasheet, the negative voltage is generated as an output, or a positive voltage can be applied to change contrast.

    I've not worked with that exact display, but with similar ones, I've only used contrast and ignored any outputs from the LCD.
     
  4. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    Are u sure u got the 3V version
     
  5. houta69

    Thread Starter New Member

    Mar 8, 2009
    4
    0
    Thanks for the feedback guys. I was under the impression that this LCD would run at 5V or 3V and that at 3V you may need Vee for contrast temperature compensation.

    My part is actually a LCD-016N002C YYH-ET, rather than the LCD-016M002C that I linked previously. The technical note on its product page shows that this display does not have a negative voltage generator on board and I confirmed that by powering it up and observing that there's nada on that pin (actually I get no signs of life at all (or Vee) at 3 or 5V).

    Most of my projects interface with a PC... the few times I've needed an LCD, I've been a weenie and used one serial backpack or another. This time I thought I'd save a few bucks and interface directly, but now I'm starting think that I picked as less than ideal one to start with.
     
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