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Problem with connecting USB with PIC18F4550

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garg29

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hi all ,
m designing an application using pic18f4550 . m making usb interface. M unable to connect the link between the controller and usb .i tried putting 220nF to 470nF capacitors on the Vusb pin .the problem is that when i touch the Vusb pin of the controller with my finger the communication starts otherwise there is no communiaction byitself. i tried all possible solution but unable to take out the noise..please help........
 

Re: pic noise usb

May be you have ground problem. Try to ground your voltage supply(-)

good luck
 

pic noise usb

thanks....but how can i provide a seperate ground
 

pic noise usb

You don't need a separate GND, your problem lies somewhere else. Maybe decoupling caps are missing? MCLR pullup? Bad wiring?
 

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