I current-limit with an inline resistor, and also voltage divide prior=20
to that. For say a 0-5V signal on a 5V-powered chip, using either a pair=20
of equal value resistors for the voltage divider I can get full ADC=20
scale with either (a) another pair of equal value resistors for the=20
Vref+ if it's ratiometric or (b) using a 2.5V reference (if it's absolute).

Cheers,
-Neil



On 8/27/2017 11:52 AM, David C Brown wrote:
> Spec A25 for the PIC16F87X gives the range for an analog input to be
> (Vss-0.3) < Vin  < (Vref+0.3).
>
> This is not listed as an Absolute Max Rating so I am wondering what the
> consequences of exceeding the upper limit would be?
>
> Would it damage the ship and, if so, is there a cunning way of protecting
> it?
>
>
> __________________________________________
> David C Brown
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> <http://www.jb.man.ac.uk/~dcb>
>
>
>
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