Lpc2000

The LPC213x User Manual contains the following Note in Table 143:

"Note: if the A/D converter is used, signal levels on analog input 
pins must not be above the level of V3A at any time. Otherwise, A/D 
converter readings will be invalid."

Are you saying that the User Manual is wrong?


--- In lpc2000@yahoogroups.com, "philips_apps" <philips_apps@y...> 
wrote:
> 
> First of all a happy and successful New Year to everybody!
> 
> There have been some questions about 5V tolerance of analog pins.
> All device on the market before the LPC2130 series can not tolerate 
5V
> on any pin that is configured or can be configured as analog input 
pin.
> Starting with the LPC2130 series, pins that are not configured as
> analog inputs (but could be) will no longer have a negative effect 
on
> the ADC result. 
> Please keep in mind that the pin 0.25 DAC output is not 5V tolerant
> even  if used as digital I/O.  The effect will be that it starts
> sinking current if not externally limited to the bitter end of 
thermal
> destruction. So at the very least limit the current if you expect 
more
> than Vdd on that pin.
> 
> Another question was there about 3.3V being up and running while 5V
> are connected to some I/O pins. If you generate the 3.3V off the 5V
> input using a voltage regulator, the delay will be short to have 
3.3V
> after 5V, in fact it might actually be at 3.3V before the voltage
> reaches 5V externally. The important issue is that during a longer
> period of time with a pin externally driven up to 5V and no Vdd for
> the microcontroller, there will be stress to the gate oxide and 
sooner
> or later the device will die. So, don't do that but do not worry 
about
> a 3.3V voltage generated from a 5V during power up. 
> 
> Hope I did not add to the confusion but answered to some of your 
concerns.
> 
> Off to a good start, Robert