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Max232 wiedermal Fragen !

Discussion in 'SimTools compatible interfaces' started by NReim, May 7, 2008.

  1. NReim

    NReim New Member

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    Hallo erstmal an euch alle hier heute Morgen

    Ich habe da nochmal eine frage zu der MAX232 Schaltung auf dem AMC Controller von TronicGr.

    Ich habe im Netz jetzt schon mehrfach gesehen das die Schaltung für den Max232 wesendlich einfacher aufgebaut werden kann, wieso ist sie auf dem AMC Controller so aufgebaut ( mit den Transistoren und wiederständen usw. ) ! Das dient jetzt nur dazu um zu verstehen wesswegen dieser weg gewählt wurde..

    Grund:
    Ich baue grade ein ATmega Test Board, weil ich voll daran interessiert bin bisschen was mit dem Controller zu Experimentieren ( keine Angst kein versuch eine neue Steuerung zu erstellen ) und da will ich auch eine Serielle Schnittstelle unterbringen, jetzt frage ich mich natürlich welche art der Anbindung ist die Bessere, die STandartschaltung MAX232 oder die Art die TroniGr gewählt hat...


    Mfg: Nico
    NReim, May 7, 2008
    #1
  2. tronicgr

    tronicgr

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    Hi Nico,

    In the first versions of my AMC controller I had the very simple max232 circuit you mention, but for some reason I could not get it working right! It was causing reset of the Atmega8535 after a few seconds of receiving data in 115Kbps speed! So I had to alter it by adding the extra circuitry you see. The extra circuitry is a copy of the max232 circuitry used on STK500 development board on which I originally developed my AMC interface. In addition I had to also add an extra resistor and a led to further reduce the current passing to the RX line that was still introducing the reseting problem...

    You can try the simple max232 circuit and see for yourself!

    Regards, Thanos
    tronicgr, May 7, 2008
    #2
  3. NReim

    NReim New Member

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    Thank you Thanos for this Information

    Now i will use your Max232 circuit for my Development Board to learn some about the ATMEGA32 and 644

    Best Regards: Nico
    NReim, May 7, 2008
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