Datasheet help: ELM1157AE

Discussion in 'Electronics Resources' started by Aklem, Aug 3, 2009.

  1. Aklem

    Thread Starter Active Member

    Jun 18, 2009
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    This is a 5x7 dotmatrix that i bought from sayal: http://www.sayal.com
    the description is wrong so i think the manufacture is too

    ELM1157AE
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    Going to the Everlight site failed to turn up that part number. It may be obsolete. It should be a single 7 segment display.
     
  3. Aklem

    Thread Starter Active Member

    Jun 18, 2009
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    it is the 5x7 red dot matrix
    it says the part number right on it
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
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    That is odd - the 7 segment display identification comes from the datasheet archive web site. If you have a voltage source, you can figure out the internal connections. For 6 volts, use a 470 ohm resistor to limit current (1200 ohms for 12 volts). You have to guess as to which pin is the common anode or cathode, but you should be able to get all the dots to light and make a diagram of which pin is connected to which LED's.
     
  5. Aklem

    Thread Starter Active Member

    Jun 18, 2009
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    i dont think its common cathode or anode because there is only 14 pins and 5*7 = 35
    i know there could be some polarity multiplexing or something else but it would be way easier to just find the datasheet
     
  6. Aklem

    Thread Starter Active Member

    Jun 18, 2009
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    I really dont want to test it like that this is very annoying!
     
  7. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Here are some datasheets from OTHER displays.
    This is to give an idea how the display may be connected.

    Greetings,
    Bertus
     
  8. rjenkins

    AAC Fanatic!

    Nov 6, 2005
    1,015
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    One set of pins will be common across each row of LEDs, another set common along each column of LEDS.

    When you put power between a row pin and a column pin (with a limiting resistor), the LED at that intersection will light.

    Once you find any two pins that light a LED, you should very quickly be able to move along the pins and find which set selects the rows and which set selects the columns.
     
  9. Aklem

    Thread Starter Active Member

    Jun 18, 2009
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    yep ill do that but notice that 14 pins and 12 rows and collums (5 + 7) so what are the other pins?
     
  10. ELECTRONERD

    Senior Member

    May 26, 2009
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    Usually only one pin is necessary for the cathode. The rest are used to light up the dots.
     
  11. Aklem

    Thread Starter Active Member

    Jun 18, 2009
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    i dont think its that, its just silly to have more pins
     
  12. rjenkins

    AAC Fanatic!

    Nov 6, 2005
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    The other two will most likely be unused.
     
  13. Aklem

    Thread Starter Active Member

    Jun 18, 2009
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    .. So its rows and colums? Okay...
     
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