URIx USB current draw and USB sound FOB current draw
Anyone have numbers for this? I'm looking at buying a powered USB 2.0 hub to run two URIx and maybe up to 2 sound FOBs. Wondering how much current I should need. Thanks, Jonathan
I don't have the specs on the URI but it is well below the usb max. I am sure you could run 4 on a non powered hub if you wanted. I have definitely run two on a powered, but not plugged in, hub on the Beagle Bone Black thus getting all power from the one Black usb port. The question is not power but rather if the hub works well with the data. Not all hubs are created equal. Some may not work well. If you are using a hub because you are running on the Beagle Bone Black I would recommend just using another Black. I think you will have better results. Good hubs are not cheap so throwing another Black at it is a good alternative. 73 Doug WA3DSP http://www.crompton.com/hamradio
Date: Sun, 6 Jul 2014 21:56:12 -0400 From: jonathan.weirmeir@gmail.com To: app_rpt-users@ohnosec.org Subject: [App_rpt-users] URIx USB current draw and USB sound FOB current draw
Anyone have numbers for this?
I'm looking at buying a powered USB 2.0 hub to run two URIx and maybe up to 2 sound FOBs.
Wondering how much current I should need.
Thanks,
Jonathan _______________________________________________ App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
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We do have numbers on the fobs, anyway. Page 22 of the cm108 datasheet, and page 29 of the cm119 sheet, both show an absolute maximum rating of 70mA. There's usually an off-chip LED on the fobs, so adding say 10-20mA for that, and then accounting for random little consumptions by other parts, planning for 100mA for each fob seems safe. Unfortunately, I can't help with numbers on the URIx requirements; I hope someone else can. Powered USB hubs vary widely, as I think we've all seen, in both per-port and total current available. And as others point out, it's often down to trial and error. If you find a great one with reliable numbers, I hope you'll report back. Good luck! $0.02, Eric K5BFC On Sun, Jul 6, 2014 at 7:56 PM, Jonathan Weirmeir < jonathan.weirmeir@gmail.com> wrote:
Anyone have numbers for this?
I'm looking at buying a powered USB 2.0 hub to run two URIx and maybe up to 2 sound FOBs.
Wondering how much current I should need.
Thanks,
Jonathan
participants (3)
-
Doug Crompton -
Jonathan Weirmeir -
K5BFC