> 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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Re: [lpc2100] MAX3232 problems?
2004-01-07 by David Willmore
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