Thanks Andrew

Have double checked, but will triple check !!!, will also download
AN232-02 from FTDI and follow advice,I have access to a scope, but
unfortunataly will be next week now.

This is first attempt with a surface mount PCB, I may have been
approx half a second soldering each pin of the FT232, was that to
long, could I have damaged the chip ???

Thanks
Regards Andy.



--- In sprog-dcc@..., "andrew_croslanduk"
<andrewcrosland@...> wrote:
>
> Andy,
>
> --- In sprog-dcc@..., "Andy" <andy2000@> wrote:
> >
> > Hi Group
> >
> > I have just part built my SPROG kit. upto the USB testing section.
> > unfortunately I struggling. two separate issues I think ??
>
> They are probably related. In case anyone isn't aware, the kit
> version is only available, to members, from MERG and is a slightly
> older (but fully compatible) version.
>
> >
> > 1)
> > My computer does not always recognise that the SPROG is attached,
> but
> > seems to be more reliable when i increase Vin to 17 to 18.5v. but
> > still temperamental !!!
>
> Vin should not make any difference, check thoroughly around the
> voltage regulators (the LM317 and the 78L05).
>
> >
> > 2)
> > Once recognised (not sure if this is normal) windows xp responds
> with
> > yellow box in bottom right corner :-
> >
> > "USB Device Not Recognized"
> > "One of the USB devices attached to this computer has
> malfunctioned"
> > ".........."
>
> Windows knows that you have connected something to the USB but
cannot
> complete the enumeration to identify exactly what, and load the
> appropriate drivers. The former is a result of detecting the change
> in bus loading, the latter by communicating with the device. Double
> (and triple :-)) check component values and soldering around the
> FT232 and the passive components between it and the USB connector.
If
> the 5V is out of spec, that would certainly be an issue. Also try
the
> troubleshooting app note AN232-02 from FTDI, although that assumes
> access to an oscilloscope.
>
> Hope this helps,
>
> Andrew
>