AGSCalabrese wrote:
> I have looked at the datasheet for the 10F206 and I see that the
> internal voltage reference can vary from 0.55 V to 0.65 V.
>
> Is the internal voltage reference stable at whatever value it happens
> to be ?

Reasonably so.  The problem is the initial accuracy since these things are
not trimmed in production.

> If I were to charge a capacitor through a variable resistor would I be
> able to determine the value of the variable resistance by discharging
> the capacitor using the PIC comparator pin and then switch to
> measuring the external voltage using the comparator ?

Yes, that's a common way of making a A/D when there isn't one.  Keep in mind
that the PIC 10 has no interrupts, so any loop waiting for a bit change will
have 3 cycles of measurement uncertainty, which is 3uS on a 10F206.

Why use the fixed reference though unless you are trying to measure a
voltage?  Using a resistor divider from Vdd would give you better margin and
makes the measurement independent of Vdd.


********************************************************************
Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products
(978) 742-9014.  Gold level PIC consultants since 2000.
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist