Confused about Vusb on PIC18F

[Rusttree]

I'm trying to setup the USB module on a PIC18F14k50 and the Vusb pin is confusing me. Throughout the reference sheet, it mentions repeatedly that Vusb must be connected to a supply voltage (~3.2V). But all of the example circuit figures just show a bypass capacitor on Vusb connected to ground. I understand the need for a bypass cap, but what happened to connecting Vusb to a supply voltage?

Also, I've read that a electrolytic cap would be a no-no in this case. Why is that so? I don't have any ceramics in the 0.22 - 0.47uF range, but I do have a 0.47uF electrolytic, so that's why I'm asking.

Thanks!

 

[nickelflippr]

The PIC18F14k50 has a built in regulator, so just the cap is needed. Don't tell anyone, but I used a .47uf electrolytic for the very same reason, and it works for hobby/proto use. So long term, you would want the low ESR that a ceramic cap would afford, or at least that's my guess.

 

[Rusttree]

Thanks nickelflipper.

And don't worry, your secret is safe with me.