max232 and atxmega128a1

kits · Joined: 18 Dec 2008 Posts: 67 Location: IRAN

hello all
i like connect max232 and atxmega128a1 directly!
and think so output of max232 is around 5 volt and in transmit or receive from max232 maybe xmega damage

i have that question , can i connect max232 to xmega directly?
thank you Exclamation

matevz · Joined: 14 Oct 2010 Posts: 2

I think that this is not good to connect max232 directly to xmega128a1
For xmega128a1 I usually use max3232, has the same pin configuration as MAX232.
The difference is in supply voltage:
MAX232 work at 5V, output end input level = 5V
MAX3232 work at 3V to 5.5V, output end input level = 3V to 5V depending of
power supply,(accept 5V logic input with 3.3V supplay).

rileyesi · Joined: 19 Dec 2006 Posts: 398

Hi,

Look at the MAX232 datasheet on page 17 you sill see a suggested circuit. Unless I am very much mistaken, all you need to do is connect the microcontroller to the "TTL/CMOS" pins (either input or output as needed).

Be sure to use the capacitors as dictated in the datasheet.

Hope this helps.

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