Lpc2000

LPC also need core voltage of 1.8V.
No brownout, so you need to implement that too.
Not sure if  you have external memory  RAM/FLASH  if yes , what supply voltage needed  for that .... Now a days 2.7V to 3.3V is a standard voltage range and you can find overall project cost cheaper by using pij compatible /drop in replacement components.
Also power cnsumption will be lower at 3V...
I think, not all GPIO are 5V tolerant...
k b 
  ----- Original Message ----- 
  From: dijucthat 
  To: lpc2000@yahoogroups.com 
  Sent: Wednesday, March 15, 2006 1:06 PM
  Subject: [lpc2000] 5v system integration


  I have a project that was setup for a 5v AVR that I would like to 
  convert to an LPC2294.
    
  Q1: Is it better to use a simple voltage divider on the GPIO Input (to 
  get 3.3v) or should I leave it at 5v? (I know it says 5v "tolerant", 
  but is it safer at 3.3v)

  Q2: On GPIO outputs, can I use a pullup to get 5v, or should I use a 
  buffer, ULN2003, etc.? (again, I am concerned with reliability)

  Q3: On the sensors designed for 5v operation, is an op-amp with gain 
  <1 the best solution to achieve 0-3.3 scale?

  Q4: On the ADC inputs, I have read that you should ues pullups even if 
  they are not in use.... does this apply to all LPC? 

  Thank you very much for any response!
    Daniel.





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