On Thu, 19 Dec 2002, Matt Pobursky wrote:

> On Thu, 19 Dec 2002 16:11:19 -0500, Olin Lathrop wrote:
> >=A0
> >=A0Thanks, this is exactly the kind of feedback I was looking for. =A0=
I
> >=A0have meanwhile read the data sheet for the FT245BM. =A0I think it's=
 a
> >=A0better fit than the PDIUSBD12 or the SL811S, but I haven't yet look=
ed
> >=A0around for price and local support seems to be from some guy in a
> >=A0garage in New York.
> >=A0We'll see how long it takes for him to return my call.
>
> Saelig has been around for quite a while -- at least based on their ads
> I've seen in Circuit Cellar Ink and other trade mags. They got back to
> me quickly, same day or next day as I recall.
>
> >=A0One issue with this chip is that it requires all the configuration
> >=A0parameters in an external EEPROM. =A0Not too bad, but it would be a
> >=A0lower chip count if I could supply the configuration parameters fro=
m
> >=A0the microcontroller (18F258) before enabling USB. =A0The spec sheet
> >=A0completely omits the EEPROM data layout, but I haven't dug around f=
or
> >=A0it on the FTDI site yet.
>
> FTDI has a software utility for loading all the configuration
> information via USB. The spec for the EEPROM layout is also there too,
> I think in an application note -- I know I've run across it in the
> past. Other than having an additional EEPROM chip, the FTDI parts are
> very convenient for getting USB functionality with a minimum of effort.
>

Also check out http://www.dlpdesign.com.  They have prebuilt assemblies
with the FTDI chip, AND eeprom already onboard.

I got one of each recently, but haven't really used them yet.  Only thing
I've done so far is connect them (don't forget to provide power ... eithe=
r
external or connect to usb power or the won't get enumerated ... don't as=
k
how I know)  and load the driver.  One thing that did happen was I
hot-disconnected one and it caused my XP O/S to blue-screen (for you
non-MS users out there, that's bad, bad, bad).

-- Mitch

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