Lpc2000

Jan,

In our case, using a LPC2214 and a two layer board. We had 
no problems with compliance testing.  In fact our very first 
board using this part, passed with quite a wide margin.

In our experience, it's rarely the cpu that causes problems
with EMC, but all the other stuff that's on the board, or 
what the board connects to.

Do to the volumes we produce, we always start with two layers, 
and all parts on one side.  We only go to more layers if we 
have to...

From the manufacturing costs, two layer and all parts on one 
side is the cheapest board to build.

Tim Larson


--- In lpc2000@yahoogroups.com, "Jan Szymanski" <janek@b...> wrote:
> 
> Is this a serious design or just to play with the chip ?
> If it is for playing than it is cheaper to buy an eval board (see 
> Olimex)
> If it is serious, with 2 layer, you have very little chance to go 
> through EMC aprovals. Check what is the difference in price 
between 2 
> and 4 layer pcb and compare it to the value of your time.
> (see other email for the rules of decoupling)
> good luck
> Jan
> 
> 
> --- In lpc2000@yahoogroups.com, Owen Mooney <ojm@s...> wrote:
> > I hope this question is not too ignorant!
> > 
> > Is it necessary to link to all the VSS and VDD lines in the chip?
> > 
> > I'm working on a tight 2 layer layout.
> > 
> > Why are there so many?
> > 
> > Owen Mooney