Hi,

What is the voltage at MCLR without the target chip connected?


On Fri, 30 Jul 2004 22:13:11 -0500, Sean A. Walberg <sean@ertw.com> wrote:
> Hi,
>
> I've put together a Wisp628 which I can connect to, but it's unable to
> read the ID off the target chip.  When I measure MCLR, it's at 8v
> instead of the expected 13V.
>
> I've switched out all the parts in the charge pump, and even gone so far
> as building a new board, but I get the same thing.
>
> The voltages on C6/7/8's positive terminals are 8, 9.5, and 9V
> respectively while the pump is active.  While I see about 3V on pin 9 of
> the PIC, I don't see anything on 6 or 5.  Since I don't have a scope, I
> don't know if those last numbers are meaningful, though.
>
> I'm not sure where to go from here...  I don't have any extra
> 16F628-20's to try, unless a 16F648 can be used in its place.
>
> Thanks,
>
> Sean
>
> --
> Sean A. Walberg <sean@ertw.com>                 http://www.ertw.com

--

Chetan Bhargava
www.bhargavaz.net

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