Objective Development Forums

Hi guys,

I just wanted to run something by you guys, as I am working on implementing V-USB on my ATMega8 for the first time.

To get the 3.3 - 3.6 V voltage on D- and D+, would it be alright to use a voltage divider type circuit?

I plan on using a 330 ohm resistor for R1, and 470 ohm for R2 with a 5 V source. That would give me a voltage of roughly 3.5.

I haven't seen too many reports of people using a voltage divider, which is why I wanted some insight.

Thanks

using a voltage divider limits the pull-up voltage only. Signal levels generated by the processor wont get touched. The signal levels need to be near the right levels. See the USB spec.

Hi,

Regarding the voltage divider solution we had a discussion two years ago with detailed calculation of hi and lo levels:
http://forums.obdev.at/viewtopic.php?f=8&t=1352&start=45#p16316

Ciao, Martin

Hi capcom2,
Have you completed your MIDI project, can you provide me some details about this project ?

full turn-key pcb