Lpc2000

Is it also getting hot, when you don't have a serial cable connected ?
TX <-> RX exchanged ?

BTW: using a MAX-232 on my board, it is running for hours, is not even a bit
hot.

----- Original Message ----- 
From: "David Willmore" <willmore@...>
To: <lpc2100@yahoogroups.com>
Sent: Wednesday, January 07, 2004 11:15 PM
Subject: Re: [lpc2100] MAX3232 problems?


> > Do the CAPS have the right polarity ?
> > Pay attention: Pin 6 is the - side of the CAP, GND this time the '+'
side.
> > Same thing for Pin 2: - side to VCC 3.3 and + side to Pin 2.
>
> Used ceramic caps.  Thought they were too small, so I replaced them with
> 4.7uF tants--which I was very sure to follow the data sheet and get the
> polarity right.  So, that's probably not it.
>
> The datasheet shows the V+ cap going to ground on the - side, but Leon's
> board has it going to Vcc.  That shouldn't make a difference, but it's
> a little difference that I noticed.
>
> > But usually when something above is wrong, the CAPS go hops (really, i
saw
> > tantals burning...).
>
> They didn't do that, so one thing went right.  Ever seen a 'lytic go?
It's
> like confetti. :)
>
> > Have you used 3.3V as supply voltage for the MAX and the CAPS ? But i
had a
> > look at Maxim website and MAX3232 can also be driven by 5V. So this is
not a
> > problem.
>
> It's running from the 3.3V supply on the board.
>
> > The RS232 and TTL side is not exchanged ?
>
> Uhhh, didn't look like it.  Take a look at the board layout on Leon's
website
> for verification?
>
> Cheers,
> David
>
>
>
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