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    Приветствую Вас, Гость · RSS 2018-01-17, 11:32 AM

    Главная » Файлы » радио » измерение

    Thermometer with Four-Digit LED Display
    [ Скачать с сервера (3.1Kb) ] 2011-04-16, 0:17 AM
    Andreas  Ktihler  (Germany)


    Until recently,  the Philips  SAA1064  LED  driver lC has  been  a sort of unofficial standard for driving seven-segment  LED  displays. lt can be used to implement  four-digit displays that can
    be driven over  an l2C bus. However,  no matter how  it's packaged  (DlL24 or SO24)  this lC
    is simply  on the large side with its 24 pins. Lts minimum supply voltage  of 5 V and quiescent
    current  of nearly 10 mA are also not exactly state  of the  art now.


    An  attractive  alternative for tasks  ofthis sort is the Maxim  MAX6958  lC. lt is available  in

    the smaller QSO package  with only 16 pins, can operate at 3.3 V, and has a shutdown

    mode  with a current  consumption  of only 20 pA. lnspired by this progress,  the author

    resolved to design a digital thermometer  circuit using this lC. Aside from the MAX6958,

    four common-cathode  LED display  modules (Toshiba TLR  324) and an Atmel  AT89C2051

    microcontroller (other types could conceivably be used), all that's necessary  is a suitable temperature  sensor.  The selected  device, a National Semiconductor  lM75,  fits wellwith

    the  rest ofthe electronics  because  it is also l2C compatible. The microcontroller  clock signal

    for this simple  application  can  be generated by any  crystal with a frequency  in the range

    of 4 to 12 MHz.


    While writing the assembly  language firmware,  the author had to battle with the

    complexity  of the display  driver, a consequence  ofthe  restricted  numberofpins. The

    type of multiplexing  used  here by Maxim  has already  been described  in detail in Elektor  Itl.

    lf you  want to know what goes  on behind  the scenes  with this driver  lC, you can  find a full

    explanation in Maxim  Application  Note  1880 tzl. Naturally,  the Elektor web  page  for this

    article  [:] offers  not only a ready-made  hex  file but also  the author's  fully  commented source

    code  file, so you can modify  the software if you so desire.  lf you simply  want to build  the

    circuit and aren't interested in programming the  microcontroller,  you can order  a pre-pro-

    grammed device from the Elektor 

    (080536-11)

    7-8 2010  elektor

     

    [1] Charlieplexing,  elector july & Auqust 2006

    www.elektor.com/060124

     

    [ 2] www.elektor.com/080536

    software (080536-11)
    Категория: измерение | Добавил: sirak | Теги: lm75, MAX6958, LED Display, AT89C2051, Andreas Ktihler, Four-Digit, thermometer
    Просмотров: 2474 | Загрузок: 128 | Комментарии: 5 | Рейтинг: 0.0/0
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