Help me solve my problem with overheating PIC18F2550 and MAX232

[rezaf]

Hi
May I want you see my circuit and say it's problem to me?
when I turn on it's supply the PIC and MAX232 go heating and don't work correctly.
(in assembled board I used PIC18F2550 for both PIC's, to test)
Thanks.

 

[rezaf]

Re: PIC circuit problem

any answer ??
Please Help Me.

 

[betwixt]

Re: PIC circuit problem

Assuming J7 is really +5V and 0V the only things I see that might cause a problem are the lack of capacitors on Vusb pins and that there are lots of floating pins. The MAX232 should never run hot so I suspect a wiring problem near it.

Brian.

 

[rezaf]

Re: PIC circuit problem

Very Thanks. Now with your answer, I know that in total the schematic don't have problem and go to resolve wiring problems closer.
Thanks.

 

[keith1200rs]

PIC circuit problem

You schematic doesn't show the power and ground connections to the microcontrollers or MAX232. I think it is dangerous to rely on implied connections - are they really tere and if so what are they connected to?

Also, J7 shows +5V and -5V but the -5V is connected to ground (mentioned by betwixt). Depending on how that is really connected it could explain your heat problem.

Keith.