View unanswered posts | View active topics It is currently Tue Dec 10, 2019 1:00 pm

Reply to topic  [ 4 posts ] 
 USB power limits 
Author Message

Joined: Tue Apr 21, 2009 2:06 pm
Posts: 59
Post USB power limits
What is the maximum electrical current available on the PC3:
- 2 rear USB 2.0 ports
- 2 rear USB 3.0 ports
- front FACE module 4 USB ports

Tue Sep 11, 2012 9:11 pm

Joined: Tue Apr 21, 2009 2:06 pm
Posts: 59
Post Re: USB power limits
From what I can tell:
- the USB 2.0 specification requires 500mA per bus
- the USB 3.0 specification requires 900mA per bus

So the question is: Are all 4 FACE USB 2.0 ports on one bus? Or do they share the same bus as the 2 rear USB 2.0 ports? I'm assuming the USB 3.0 ports are separate, as they're powered by a separate TI TUSB7320 chip.

Tue Sep 11, 2012 9:17 pm

Joined: Fri Aug 17, 2012 8:59 pm
Posts: 4
Post Re: USB power limits
The fit-PC3 Basic, LP and Pro have an additional USB 2.0 4 ports on the front (FACE module), powered by the same controller that powers the rear USB 2.0 ports.

Here's a block diagram for further reference: ... iagram.jpg

Wed Sep 12, 2012 8:35 pm
Site Admin

Joined: Thu Jun 02, 2011 1:13 pm
Posts: 1260
Post Re: USB power limits
USB3 has a dedicated USB3 controller, separated from the USB2. Two rear USB2 ports, two front left and two front right have a separate USB2 controller for each pair

Gabriel Heifets

Fit-PC2/3/IntensePC support.

Thu Sep 13, 2012 8:08 am
Display posts from previous:  Sort by  
Reply to topic   [ 4 posts ] 

Who is online

Users browsing this forum: No registered users and 1 guest

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group.
Designed by STSoftware for PTF.