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How to hook up USB to the PIC 18f4550 ?

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Slayerza

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18f4550 and USB

Hi,
I have an embedded system using a PIC18LF4550 running at 20MHz and 3.3V. The question is how do I hook up the USB to the PIC? Electrically speaking I gathered from the USB spec that a LDO on the Vbus (+5V) line of the USB should do the trick.
Thus making the PIC side of things 3.3V.

I should also mention that the PIC side of things is self powered.
Is this correct?

Thanks in advance
Henri
 

Re: 18f4550 and USB

Hi Slayerza

If you are already running PIC at 3v3 - USB runs at 3v3 you just need to disable the internal regulator by VREGEN configuration bit and connect Vusb to Vdd 3v3 supply. RTFM

Device data sheets and app notes here:

https://ww1.microchip.com/downloads/en/DeviceDoc/39760a.pdf

**broken link removed**

regards ... Polymath
 

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