Is this for USB HID (your board is a device) or USB MSD (your board is a ho=
st=20
connecting to a thumb drive). I guess it is the former since you also want =
to=20
be able to power the board from USB....

You need VBUS, D+ and D- from the host. You also need to provide 3.3V (VDD)=
 to=20
VUSB. That's it.

/Ruben

> Been searching around but am a bit overwhelmed...
> I've been working with the PIC24FJ64A for a little while, gradually makin=
g
> a custom PCB layout for my project; several incarnations now, keep making
> silly mistakes.  Anyway, I started investigating USB bootloaders with the
> thought that I might need the ability for user firmware updates in the
> future, and discovered that the 24FJ64A has a very closely related
> brother, the 24FJ64B!  Main difference being inbuilt USB.
>=20
> Now I'm a fair ways from getting around to doing any bootloading stuff,
> but thought I might try to swap chips now and allow room for USB on my
> next PCB design, preferably changing only the location of some tracks and
> adding some extra components in unused areas;  I've got a cheapie
> laser-cut solder stencil, so would prefer to be able to still use it, at
> least until the next _major_ revision.  It's almost pin for pin, I can
> rearrange some tracks to other pins where required, but what I'm really
> unsure of is which exact physical connections are REQUIRED for using USB
> for ONLY re-writing the firmware?
>=20
> I'm guessing D+ and D- are givens, but what about the likes of VUSB,
> pull-ups...?  Has anyone found a good diagram of what is required?
>=20
> I'd like eventually to be able to upgrade firmware via USB, and also
> provide power via the USB port for internal recharging (helpful thread a
> few weeks back for that).
>=20
> A datasheet (pins on page 6):
> ww1.microchip.com/downloads/en/DeviceDoc/39881e.pdf
>=20
> B datasheet (pins on page 6):
> ww1.microchip.com/downloads/en/DeviceDoc/39940d.pdf
>=20
> Thanks for any input
> Lee
>=20

--=20
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