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27977 LCD Display — Parallax Forums

27977 LCD Display

piguy101piguy101 Posts: 248
edited 2011-08-02 13:40 in General Discussion
I am about to order the 27977 LCD display from Digikey, but I do not know which Rev. I will get. Digikey has trouble keeping these displays in stock so I figure they have the latest rev., is this correct? Second question: What is the connection off the LCD display, is it a 3-pin 0.1" spacing male connector?

Comments

  • PJAllenPJAllen Banned Posts: 5,065
    edited 2011-07-30 14:02
    Yes, 3pin 0.1_in
    DigiKey = latest? Not necesarily. It's the Rev. that they have stocked.

    Why not get it from Parallax and order a 805-00001 or 805-00002 extension cable, too?
  • piguy101piguy101 Posts: 248
    edited 2011-07-30 14:08
    Maybe I'll try to ask Digikey what rev. they have stocked, it's worth a try. Here I go.

    EDIT: Just asked them, and they told me that they stocked the lastest rev.
  • Don MDon M Posts: 1,653
    edited 2011-07-31 08:14
    piguy101- You better have them clarify what the "latest rev." is. To them the latest revision may be the latest stock they have received. The latest revision is revision F.

    I just ordered the exact same one from Parallax asking specifically prior to my ordering for "the latest revision". I was assured that I would get "the latest revision". To my surprise I received Rev. E even though they have Rev. F in stock. Being the great company they are they have rectified my situation by replacing the ones I received with Rev. F versions. I'll know tomorrow when the replacements arrive.
  • piguy101piguy101 Posts: 248
    edited 2011-07-31 08:25
    Don M wrote: »
    piguy101- You better have them clarify what the "latest rev." is. To them the latest revision may be the latest stock they have received. The latest revision is revision F.

    Thank you for that Don, I shall ask them again to clarify which rev. they stock.
  • PJAllenPJAllen Banned Posts: 5,065
    edited 2011-07-31 08:32
    Is there a difference in their operation (E vs F)?

    PE - 'E' and earlier should not get data w/o +5 [didn't know this was a problem] and have 20/80mA draw vs 10/50mA draw on 'F' units. I guess there's no prob w/ 'F' units re. data w/o 5V on (??).
  • Don MDon M Posts: 1,653
    edited 2011-07-31 10:23
    The revision F uses an Atmel ATMega48 processor for the serial to parallel conversion. The version E used the SX28 processor. According to the data sheet on the ATMega48 it will operate from 2.5 - 5.5 volts. I am going to remove the serial back pack from the display and connect it to one of these.

    My application utilizes the Propeller and just 3.3 VDC. This display will work on 3.3 VDC and I'm hoping the serial back pack will too. Saves me from having to have a 5 VDC supply just for the display.
  • piguy101piguy101 Posts: 248
    edited 2011-07-31 11:18
    Ok, I just asked Digikey which rev. they stock and they simply said they don't have any in stock so they don't know. Oh, well it says Digikey will get some of the Displays by 8/3. I plan to ask Digikey again when they have them in stock. So will it be a big difference if I get rev. E instead of F?
  • PJAllenPJAllen Banned Posts: 5,065
    edited 2011-07-31 11:26
    There's an "issue", see post #13 (!!) here.

    PE -- I asked before, but anyway, why not order from Parallax?
  • piguy101piguy101 Posts: 248
    edited 2011-07-31 17:15
    I plan to order it from Digikey so I can get a few other parts and save a few bucks on shipping. I guess I'll wait a few days until Digikey has the display in stock and I'll bombard them with the question of which rev. they stock.
  • Don MDon M Posts: 1,653
    edited 2011-08-01 09:32
    I received my Rev. F versions today (thanks Parallax !). I have confirmed that the new Rev. F back pack board will operate on 3.3 VDC. I have attached it to a 2x20 New Haven OLED display that will also operate on 3.3 VDC. So now I have a solution for my project that eliminates the need for a 5 VDC supply.
  • piguy101piguy101 Posts: 248
    edited 2011-08-01 11:02
    You know, I've been thinking that if Digikey had a large stock of the LCD displays from Parallax they could be whatever was the latest rev. was when bought the stock, but Digikey is frequently out of stock of those displays and so when Digikey gets new stock for the displays they would have to be the latest rev. unless Parallax still manufacturers different revisions of the LCD or if Digikey bought the Parallax displays from another company other than Parallax. And I would doubt Digikey buys the displays from a 3rd party company. Does this make sense to anyone, or am I just mumbling wrong stuff?
  • PJAllenPJAllen Banned Posts: 5,065
    edited 2011-08-01 11:49
    Right stuff, wrong stuff, mumbling, articulate.
    That's all speculation.
    Who knows what twists the distribution channel takes?
    Why belabour the matter?
    Sometimes when you save a little you spend a lot.

    Maybe Parallax has the other items you wanted from DigiKey.
    When you deal with Parallax directly you get first-rate customer service.
  • piguy101piguy101 Posts: 248
    edited 2011-08-02 13:40
    Digikey just got stock of the display and right now I am asking them what rev. they have. I hope it is F!

    EDIT: They said they would reply back in a few days via email about which rev. they have, but still nothing.
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