Lpc2000

The 3.4V logic high minimum seems to be on the 1-wire side of the
interface. The UART side looks like it has the usual 2.7V minimum
logic high. In that case, it should interface with a CMOS 3.3 volt
part with no difficulty.

-- Dave


--- In lpc2000@yahoogroups.com, "seangra" <sgraham@o...> wrote:
>
> Short answer, NO.
> 
> For any electrical part you can look in the schematics, find the "DC 
> ELECTRICAL CHARACTERISTICS" section, and check the "INPUT HIGH 
> VOLTAGE".  In your case it's minimum 3.4V, so the 3.3V output from the 
> LPC2138 won't work.  Odd, because most 5V parts have an input high 
> voltage around 2.5V, as it is with most of my parts on my design.
> 
> --- In lpc2000@yahoogroups.com, "fredrikssonjohan" <johan@s...> wrote:
> >
> > Hi!
> > 
> > Sorry if this is a stupid question, but I haven't found any good info
> > about the UART levels so I better ask!
> > 
> > Need to connect a LPC2138 to a Maxim (Dallas) DS2480B which is on 5V.
> > Can they talk as it is or do I need a 3.3 to 5V buffer between?
> > 
> > Thanks for any help!
> > 
> > Cheers
> > /Johan
> >
>