Unless you have the Apple spec, then stick to 3.3v.

The current crop of iPods may be 5.5v tolerant, if only due to
protection diodes and a forgiving power supply, but you can't count on
that for future cost reductions of this same iPod, nevermind other
models with the same connector.

Even if this is a one-off project, it's not worth it.  A few resistors
will fix the problem, and you won't be surprised when you buy a new
iPod and plug it in...

You can also use something like this:
http://www.sparkfun.com/commerce/product_info.php?products_id=8745
Schematic here:
http://www.sparkfun.com/datasheets/BreakoutBoards/Level-Converter-v10.pdf

To do the voltage level conversion.

-Adam

On 8/18/08, Josh Koffman <joshybear@gmail.com> wrote:
> Hi all. I've been trying to find an answer to this for awhile but so
> far haven't come up with anything definitive either way.
>
> Is the serial remote input on an iPod 5v tolerant? Some of the
> websites I've found say it's a 3.3v port, some don't say. I found one
> that connects it directly to a PIC pin at 5v. I'd imagine the TX line
> is 3.3v but I'm only interested in sending commands to the RX line.
>
> Kinda something I'd like to go straight before burning out my unit!
>
> Thanks!
>
> Josh
> --
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> completely foolproof is to underestimate the ingenuity of complete
> fools.
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