The difference in levels wasn't a problem when I built the circuit, since
3.3 is above +2.5 and the 3.3 circuitry is +5V safe. I did tie pin 6 to +5V,
and I think I put all the grounds together (although I don't think that's
necessary).
On Feb 3, 2008 6:32 PM, Chris <[EMAIL PROTECTED]> wrote:
> Hi,
>
> I tried this: http://owfs.sourceforge.net/WRT54G.html and it doesn't
> work for me.
>
> It looks really weird how the author connected the DS2480B, which runs
> at 5V directly to the UART, which provides only 3.3V. I think this would
> need some level-shifting.
> The datasheet also says the POL-Pin (Pin6) has to be tied to +5V if
> directly connected to the UART.
>
> I made a small schematic with some resistors as level shifters:
> http://img228.imageshack.us/img228/4611/ds2480bwrtmp0.png but I don't
> think I like it. It's said that doing level shifting is very power hungry.
>
> Any better ideas?
>
> -Chris
>
>
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