A question to Wouter van Ooijen

Started by movingbait July 31, 2003
Dear Sir,
Regarding your wisp628, could you please explain why are u using a pic
to make the charge pump,and not a astable circuit to drive it like a
555, or a cross paired transistor.

I am sorry if my question is weird, but i wasnt sure if there was
another reason you used the pic.
because if a charge pump using astable means is used, the circuit
would be jdm complient as such.

Kindest Regards
MovingBait



> Regarding your wisp628, could you please explain why are u using a pic
> to make the charge pump,and not a astable circuit to drive it like a
> 555, or a cross paired transistor.

I use a PIC for the asynch communication between the PC and the
programmer, and it does the programming communication with the target,
without relying on the PC for the timing. It has pins to spare, so why
not use those for the charge pump. It circuit is not jdm complient at
all.

Wouter van Ooijen

-- -------
Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products



Thank-you
I am trying to make a programmer, using only a charge pump, and jdm
complient, without a pic inbuilt, so you answered that question.

Regards MovingBait

--- In , "Wouter van Ooijen" <wouter@v...>
wrote:
> > Regarding your wisp628, could you please explain why are u using a
pic
> > to make the charge pump,and not a astable circuit to drive it like
a
> > 555, or a cross paired transistor.
>
> I use a PIC for the asynch communication between the PC and the
> programmer, and it does the programming communication with the
target,
> without relying on the PC for the timing. It has pins to spare, so
why
> not use those for the charge pump. It circuit is not jdm complient
at
> all.
>
> Wouter van Ooijen
>
> -- -------
> Van Ooijen Technische Informatica: www.voti.nl
> consultancy, development, PICmicro products