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Michael Karas
02/01/12 14:59
Read: 534 times
Beaverton Or

#185766 - What a bunch of fatty sausage...
Responding to: ???'s previous message
Adam Blue said:
Michael Karas said that PNP type transistor can be used.
Yes, I know that solution. However, I don’t want to use Low-Active Design.

And why not? If you come and tell me it is because you want '1' value in software to represent "relay energized" I'll say 'get over it'. Use the instruction that inverts the bits before you write them to the port register.

Assume that; There is can be cold solder betwen 8051 I/O pin and transistor ‘s Base pin. When I/O pin is logic-1. Due to cold solder, PNP transistor’s Base pin will be logic-0 and RELAY ACTIVE… (Who can warrant that such an event won’t happen.)

What a crock full of fatty sausage!! If your supposed 'cold solder joint' is exhibiting as an open circuit the base of the PNP will not be low in the circuits that I showed. It will be pulled to the emitter by the base-emitter resistor when the base resistor connection is open. Get a clue as to how the circuit works before you go try to find weak fatty sausage type arguments.

Besides that, what others of the more than several dozen types of failure modes that could happen have you bothered to analyze? An ESD jolt could just as easily fuse the output of the MCU to a shorted high or shorted low. Roll that up with the sausage.

Low-Active design is not secure for that kind of circuits.

More fatty sausage malarkey. You know, there was a time when real professional design engineers were making boards full of gate and flip-flop IC logic, that it was actually considered bad form to design any circuits with active high signalling. Especially for signals that travelled any distance. The idea that MCU port pins have to be at high level '1's to represent 'active logic" is a silly convention that is almost entirely without merit.

What can I say ???

You could resign from your ridiculous position and admit that you are on the wrong track. Hey, I tried to help you out when you were already getting cooked in this thread before I posted. Now you maybe should just take your cheap fatty sausage, mix it with some BS and get to cooking that up.

Michael Karas

List of 34 messages in thread
Power-On Port Status Problem      Adam Blue      01/30/12 08:42      
   Wrong idea      Per Westermark      01/30/12 08:48      
   you will not      Erik Malund      01/30/12 08:49      
   you are not the only one      Erik Malund      01/30/12 09:18      
   ATMEL be ashamed      Adam Blue      01/30/12 15:05      
      No, YOU should be ashamed...      Kai Klaas      01/30/12 16:15      
      Nonsense!        Andy Neil      01/30/12 16:46      
      PIC Does so      Neil Kurzman      01/30/12 23:08      
         Oh really??      Michael Karas      01/31/12 07:46      
            "Glitch" in the sense of kind of "setback in a plane"?      Kai Klaas      01/31/12 10:19      
   Try These Ideas        Michael Karas      01/30/12 17:21      
   "Glitch"      Adam Blue      02/01/12 13:12      
      what is not “ATMEL true”.      Erik Malund      02/01/12 13:37      
      I think you are making excuses      Erik Malund      02/01/12 13:41      
      Oh, boohoo!        Rob Klein      02/01/12 14:04      
      What a bunch of fatty sausage...      Michael Karas      02/01/12 14:59      
      "very easy problem"      Andy Neil      02/01/12 15:02      
   Power-On Glitch      Adam Blue      02/01/12 15:40      
      Nonsense - again      Andy Neil      02/01/12 16:28      
      Please explain what the "power-on glitch" is ...      Richard Erlacher      02/01/12 19:26      
      Into The Frying Pan        Michael Karas      02/01/12 20:52      
      Power-on problem...      Kai Klaas      02/02/12 05:55      
      You are still blaming the tools      Per Westermark      02/03/12 05:55      
   Design the hardware first.      David Prentice      02/02/12 07:21      
      do not Design the hardware first.      Erik Malund      02/02/12 07:30      
   Power-On Glitch      Adam Blue      02/02/12 15:07      
      that you had the worst possible reset circuit      Erik Malund      02/02/12 15:59      
      RC-reset...      Kai Klaas      02/02/12 17:20      
      Sorry, double post, don't know why...      Kai Klaas      02/02/12 17:21      
         No, you're not the only one      Richard Erlacher      02/02/12 21:12      
      Would I Hire?      Michael Karas      02/02/12 22:44      
         incidentially      Erik Malund      02/03/12 07:09      
   Power On satus Problem      Satish S Munot      02/29/12 10:16      
      echo, echo, echo      Erik Malund      02/29/12 10:30      

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