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Re: [lpc2000] lpc2138 5V tolerant is not really tolerant!

2006-01-27 by Rob Jansen

Gus,
> On my board I have LPC2138 connected to MAX232 running at 5V. I had 
> problems with UART until I added a 4.7K resistor in series. and the 
> voltage high on it now is 2.3V
>
> Are the pins real 5V tolerant? The data sheet says UART RX is 5V 
> tolerant!!!
>   
I had a MAX232 running at 5V connected to an LPC2106, no series resistors.
No problems at all running at 115200 Baud.

Regards,

    Rob

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