capacitor value for VUSB [Archive]

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Christopher4187

- 31st March 2006, 05:18

Hi,

I have a program that works on a development board but does not work on the board I made. The 18F4550 works for the internal program but the USB portion does not work at all. I have checked the traces and verified everything is OK. I am confused about the VUSB pin and what capacitor values go on that pin. I change that value and the computer starts to recognize it but I can't find the correct value. Can anyone help me?

Thanks,

Chris

Melanie

- 31st March 2006, 10:50

Nobody ever reads Datasheets... Section 17.2.2.8

Christopher4187

- 31st March 2006, 13:57

The only problem is I have seen many different configurations of caps... For example, .470uF, .200nF, .47uF and the data sheet for the 18F4550 which is 220nF. Since I have tried them all, maybe there is a different problem I am not seeing.