On Mar 8, 2007, at 3:48 AM, Markos wrote:
> maybe this is a little offtopic, but i'm sure you could
> help me. I'm implementing a simple battery charger, and I need to
> messaure voltages ranges from 0 to 12 V.
> ¿Could I use the PIC integrated ADC to messaure above 5 V (provided
> that
> I use the voltage reference pins tied to 0 and 12 V, for example)?
> Most
> external ADC have a 0 to 5V input range....
> How would you guys solve this? Any Ideas?
Be careful here...Every PIC datasheet I've seen (for PICs with on-
chip ADCs) specify that Vref not be taken much higher than Vdd, like
Vdd+0.3V or so.
You could use a resistive voltage divider or a simple op-amp
circuit to scale the 0-12V range to 0-5V.
-Dave
--
Dave McGuire
Port Charlotte, FL
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