Objective Development Forums

Re: Using a voltage divider, any problems?

2013-03-07T18:28:46+02:00

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

full turn-key pcb

Statistics: Posted by anders89 — Thu Mar 07, 2013 6:28 pm

Re: Using a voltage divider, any problems?

2012-09-03T10:24:45+02:00

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

Statistics: Posted by horo — Mon Sep 03, 2012 10:24 am

Re: Using a voltage divider, any problems?

2012-09-02T14:56:22+02:00

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.

Statistics: Posted by ulao — Sun Sep 02, 2012 2:56 pm

Using a voltage divider, any problems?

2012-08-29T22:28:14+02:00

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

Statistics: Posted by capcom2 — Wed Aug 29, 2012 10:28 pm