Lpc2000

--- In lpc2000@yahoogroups.com, "Gus" <gus_is_working@...> wrote:
>
> I don't know what Leon is trying to do here but no you can't do 
> that. If you know electronics well you will know why but if you are 
> hobbyist then just follow the many examples and schematics out there.
> 
> I agree you should read the data sheet but to newbies, data sheets 
> are nightmares LOL
> 
> Gus
> 

Leon is correct!  For a short period of time...

According to the LPC2141_42_44_46_48 Datasheet, Iohs (HIGH-state
short-circuit current is -45 mA and note 8 applies.  Note 8 says "Only
allowed for a short time period."  So, it can be done.

It is a poor idea and I wouldn't do it even if I could limit the time
period.  But the correct answer to the question is yes, it can be done.

I would have to dig deeper to resolve the LED issue.  I have seen it
done with multiplexed displays and I have done it myself.  It works
ok.  But, I don't have to guarantee my work.

As to the issue of reading datasheets - if you don't understand the
numbers, ask.  Somebody will be able to help.  Every number in the
datasheet serves to limit the way in which the device may be applied.
and is included for that specific reason.

A more important question is why anyone would want to short the
output.  It just seems wrong, somehow.  Even for a short period of time...

Richard