Lpc2000

Hi @ all
I have an problem because I cant find description what I have to do
with NC (unused) Pin's at the LPC214x because I'm just using USB one
UART and perhaps 1 or 2 GPIO Pins?

Regards
Philipp

Umm...  

May be setting them all as output and force to low??
That's what I will do...
- Believed to be less power consuming.  Leave it as input
  will be hi-Z and easily picking up noise signals.
- Lo-Z output will have lower chances of chip get zapped
  by static charge...  

It's too troublesome to pull all pin to high or low by resistors! :)
Regards

--- In lpc2000@yahoogroups.com, "philipphk" <philipp1024@...> wrote:
>
> Hi @ all
> I have an problem because I cant find description what I have to do
> with NC (unused) Pin's at the LPC214x because I'm just using USB 
one

> UART and perhaps 1 or 2 GPIO Pins?
> 
> Regards
> Philipp
>

--- In lpc2000@yahoogroups.com, "philipphk" <philipp1024@...> wrote:
>
> Hi @ all
> I have an problem because I cant find description what I have to do
> with NC (unused) Pin's at the LPC214x because I'm just using USB one
> UART and perhaps 1 or 2 GPIO Pins?
> 
> Regards
> Philipp
>

I thought I read in the datasheet to define unused pins as outputs to 
minimize power consumption.

Richard

Em Sex 10 Fev 2006 13:22, philipphk escreveu:
> Hi @ all
> I have an problem because I cant find description what I have to do
> with NC (unused) Pin's at the LPC214x because I'm just using USB one
> UART and perhaps 1 or 2 GPIO Pins?
>
> Regards
> Philipp
>
Set them as GPIO, as output, and in firmware put em at low level. And on the 
board, dont connect them.

I think I read somewhere that most unused pins should be set to output 
*HIGH* rather than low, because some of them have internal pull-ups and 
therefore a low would draw some current. That doesn't apply of course 
to open-collector outputs.

Guille

--- In lpc2000@yahoogroups.com, Xtian Xultz <xultz@...> wrote:
>
> Em Sex 10 Fev 2006 13:22, philipphk escreveu:
> > Hi @ all
> > I have an problem because I cant find description what I have to do
> > with NC (unused) Pin's at the LPC214x because I'm just using USB one
> > UART and perhaps 1 or 2 GPIO Pins?
> >
> > Regards
> > Philipp
> >
> Set them as GPIO, as output, and in firmware put em at low level. And 
on the 
> board, dont connect them.
>

Guillermo Prandi wrote:

>I think I read somewhere that most unused pins should be set to output 
>*HIGH* rather than low, because some of them have internal pull-ups and 
>therefore a low would draw some current. That doesn't apply of course 
>to open-collector outputs.
>
>  
>
Good point, thanks.  I guess a little study would need to be in order to 
see what pins are pulled which way.

TomW




>Guille
>
>--- In lpc2000@yahoogroups.com, Xtian Xultz <xultz@...> wrote:
>  
>
>>Em Sex 10 Fev 2006 13:22, philipphk escreveu:
>>    
>>
>>>Hi @ all
>>>I have an problem because I cant find description what I have to do
>>>with NC (unused) Pin's at the LPC214x because I'm just using USB one
>>>UART and perhaps 1 or 2 GPIO Pins?
>>>
>>>Regards
>>>Philipp
>>>
>>>      
>>>
>>Set them as GPIO, as output, and in firmware put em at low level. And 
>>    
>>
>on the 
>  
>
>>board, dont connect them.
>>
>>    
>>
>
>
>
>
>
>
>
> 
>Yahoo! Groups Links
>
>
>
> 
>
>
>
>
>
>  
>


-- 
Tom Walsh - WN3L - Embedded Systems Consultant
http://openhardware.net, http://cyberiansoftware.com
"Windows? No thanks, I have work to do..."
----------------------------------------------------

Please, correct me if I am wrong, but LPC210X have pull ups??? I founded 
nothing talking about that, I understood that there are no pull ups in these 
chips.



Em Sáb 11 Fev 2006 07:34, Tom Walsh escreveu:

> Guillermo Prandi wrote:
> >I think I read somewhere that most unused pins should be set to output
> >*HIGH* rather than low, because some of them have internal pull-ups and
> >therefore a low would draw some current. That doesn't apply of course
> >to open-collector outputs.
>
> Good point, thanks.  I guess a little study would need to be in order to
> see what pins are pulled which way.
>
> TomW
>
> >Guille
> >
> >--- In lpc2000@yahoogroups.com, Xtian Xultz <xultz@...> wrote:
> >>Em Sex 10 Fev 2006 13:22, philipphk escreveu:
> >>>Hi @ all
> >>>I have an problem because I cant find description what I have to do
> >>>with NC (unused) Pin's at the LPC214x because I'm just using USB one
> >>>UART and perhaps 1 or 2 GPIO Pins?
> >>>
> >>>Regards
> >>>Philipp
> >>
> >>Set them as GPIO, as output, and in firmware put em at low level. And
> >
> >on the
> >
> >>board, dont connect them.
> >
> >Yahoo! Groups Links

---- Original Message ----

From: "Xtian Xultz" <xultz@...>
To: <lpc2000@yahoogroups.com>
Sent: Saturday, February 11, 2006 3:28 PM
Subject: Re: [lpc2000] Re: NC Pin's

> Please, correct me if I am wrong, but LPC210X have pull ups??? I
> founded nothing talking about that, I understood that there are no
> pull ups in these chips.

All LPC2xxx chips have pull-ups on some pins.  See the datasheet, search for 
"pull".

Karl Olsen