ADC and External Vref

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barryw
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Joined: Wed Jun 24, 2009 2:05 pm

ADC and External Vref

Post by barryw »

Hi, Got a small problem in that the Vcc of my PIC is unstable so I need to use an external Reference voltage for my ADC ( this a battery powered circuit)
so how do I set up my ADC to use Vref+ on AN3, I am assuming that it will have to be done with a "C" statement. The PIC is a 18F819 and only AN0 & AN1 will be analog inputs. Is there an example of the code required?
Thanks

Barry W
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Benj
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Re: ADC and External Vref

Post by Benj »

Hello Barry,

Go into the properties for the ADC component and you will be given an option to enable the +Vref functionality. If you also provide a correct voltage for your Vref in the properties then the read as string and read as voltage will also work correctly.
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