Lpc2000

120kB

"What bit rate are you running the I2C bus at?"





--- In lpc2000@yahoogroups.com, "derbaier" <dershu@...> wrote:
>
> --- In lpc2000@yahoogroups.com, "Sutton Mehaffey" <sutton@> wrote:
> >
> > Yes.  I'm using the Embedded Artists 2148 Demo board, in which the
> > schematic shows pullups.  I'm connecting a RAM chip via their
> > accessory prototype board, which has direct connections to the I2C
bus.
> > 
> > Sutton
> > 
> > 
> What bit rate are you running the I2C bus at?
> The open drain I2C bus speed capability depends on the size of the
> pull up resistors on the bus, since they determine the rise time with
> the bus capacitance. If you are trying to go faster than the bus
> resistors can handle, you will encounter bus errors. To debug your
> driver logic it would probably be helpful to run the bus at a slow
> speed until you are more sure there are no software errors.
> 
> -- Dave
>