I'm reading the datasheet for the PIC18F252. On page 259, it
states that the maximum voltage on any pin (with a few exceptions) is
Vdd+0.3V. Later, on page 287, it specifies more specifically that
the maximum voltage for Vref (parameter A21) is also Vdd+0.3V.
-Dave
On Mar 9, 2007, at 3:13 AM, Markos wrote:
> Pic is PIC18F252.
>
> Dave McGuire escribió:
>> On Mar 8, 2007, at 10:21 AM, Markos wrote:
>>
>>> The datasheet does not mention anything about the voltage
>>> reference max input voltage. If you see in "electrical
>>> characteristic",
>>> states that you cannot operate the device above 0.8V over VDD in IO
>>> pins:
>>>
>>> VIH Input High Voltage
>>> I/O ports:
>>> D040 with TTL buffer 0.25 VDD + 0.8V
>>>
>>> Thats all i've found about it, because in the ADC chapter doesn't
>>> mention anything about it.
>>>
>>
>> Microchip (almost?) always lists an allowable range for the
>> external Vref input in the datasheets.
>>
>> Which PIC chip are you using?
...
--
Dave McGuire
Port Charlotte, FL
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