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???
01/05/08 00:31
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 		 #149061 - The MAX232 +10V Capacitor
Responding to: ???'s previous message
I have learned the hard way that the capacitor connected to pin 2 of the MAX232 circuit MUST be connected to VCC, not GND.

If You consult the datasheet of this IC You will notice that they state there that this pin (2) should never go below VCC. Having a big (more than 05uF) capacitor there will momentarily pull down the pine below VCC which in some cases is enough to fry the MAX232.

This is highly manufacturer depedant and prolly also depends on the batch. Bypassing this pin to VCC instead of GND is however the way they suggest to do this in the data sheet.

You can get the datasheet from Maxim site


List of 56 messages in thread
TopicAuthorDate
8051 First time user schematic check            01/01/70 00:00      
   a perfunctionary check            01/01/70 00:00      
      And            01/01/70 00:00      
      suporvisor chip            01/01/70 00:00      
         re: Supervisor chip            01/01/70 00:00      
         go to maxim            01/01/70 00:00      
            Thanks/New Schematic            01/01/70 00:00      
               Supervisor Wrong            01/01/70 00:00      
                  You could have it wired up an running by now.            01/01/70 00:00      
                     and thus            01/01/70 00:00      
               the power LED has no series resistor            01/01/70 00:00      
               The MAX232 +10V Capacitor            01/01/70 00:00      
   Another hint            01/01/70 00:00      
      port 0 pins            01/01/70 00:00      
   startup project advise            01/01/70 00:00      
      Incrimental Stages....            01/01/70 00:00      
      thanks            01/01/70 00:00      
         a comment            01/01/70 00:00      
            Agree            01/01/70 00:00      
               why schematics???            01/01/70 00:00      
               lucky you            01/01/70 00:00      
   assembly            01/01/70 00:00      
      re SILabs devboards            01/01/70 00:00      
      yes, why not            01/01/70 00:00      
         suffer            01/01/70 00:00      
   check            01/01/70 00:00      
      even worse            01/01/70 00:00      
      Ground Symbol            01/01/70 00:00      
         beware of idiots            01/01/70 00:00      
            Great Example            01/01/70 00:00      
               PCB class            01/01/70 00:00      
               Agreed, but            01/01/70 00:00      
                  Advice for someone just starting            01/01/70 00:00      
            idiocracy            01/01/70 00:00      
         regarding ground vcc symbols            01/01/70 00:00      
   Serial port pins            01/01/70 00:00      
      reply to Esko            01/01/70 00:00      
         we are here to help            01/01/70 00:00      
      Thanks for the reply            01/01/70 00:00      
   you will have hard time...            01/01/70 00:00      
      serial port connections            01/01/70 00:00      
         serial port connections II            01/01/70 00:00      
            a vbery common mistake/confusion            01/01/70 00:00      
               ... plus the infinite variations...            01/01/70 00:00      
         Opinion            01/01/70 00:00      
            a comment on the comment            01/01/70 00:00      
               SPI            01/01/70 00:00      
   One more development card argument            01/01/70 00:00      
      sure, but do you get ICE functionality?            01/01/70 00:00      
         No ICE but wire wrap is OK            01/01/70 00:00      
            and so what            01/01/70 00:00      
               To learn ?            01/01/70 00:00      
                  learning - modifying SMT            01/01/70 00:00      
                     Bino microscope            01/01/70 00:00      
                        not to worry            01/01/70 00:00      
                        site showing how to solder/desolder SMT'S            01/01/70 00:00      

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