unfortunately not here !
F87x is extremely expensive ( about 13...15 USD )
regards,
Vasile

On Thu, 13 Dec 2001, dr. Imre Bartfai wrote:

> Hi,
>
> the difference at us between F627/8 and F870 is below $1. I do not think
> it is the effort worth (the opamp is about $0.50).
>
> Regards,
> Imre
>
>
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> On Thu, 13 Dec 2001, Vasile Surducan wrote:
>
> > On Thu, 13 Dec 2001, dr. Imre Bartfai wrote:
> >
> > > If you want to have a relatively exact reference at low cost, use
> > > LM336-5.0. I agree with another colleagues the some mA's at the
> > > measurement of 12V is no concern (I guess you want to power the PIC from
> > > the PC also). Another remark: I guess 16F877 would an overkill
> > > here. 16F870 would suffice (28 pins also, has an USART, too, costs less
> > > than half of the former one).
> > >
> >   Imre, what do you think about an 627/628 with an extra operational
> > amplifier chip (with 2 OA inside ) and a simple slope AD converter.
> > There is an application note ( with 16C622 I think) on Microchip CD.
> > Will be definitely cheaper than 16F870, but a little dizzy in software.
> >
> > Vasile
> >
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> >
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