Em 28/6/2010 15:35, Marechiare escreveu:
>>> You don't "NEED a slow rise time".
>>>       =

>> You do if you want to keep away the frequencies that will
>> cause trouble on the transmission line.  Low pass filtering
>> a edge will increase its rise time.  Conversely, faster
>> edges have higher frequency content.  You can't cheat
>> monsieur Fourier.
>>     =

> In the context of this thread you don't need to slow the PIC output
> rise time. RTFM PIC32MX and M25P16V.
>   =



No, you need to slow the *line* rise time, I don't know if the PIC32 has
slew-rate control.

To put things in perspective, Atmel recommends to add series resistors
to *ALL* I/Os of the AT91SAM9G20 (400MHz ARM9), to meet EMI and RFI
emission standards.

Isaac

__________________________________________________
Fale com seus amigos  de gra=E7a com o novo Yahoo! Messenger =

http://br.messenger.yahoo.com/ =


-- =

http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist