What exactly is "USB Power Management"?

Questions, comments and suggestions regarding Phase One IQ4, IQ3, IQ2 and IQ1 series digital camera backs.

What exactly is "USB Power Management"?

Postby Burn Photo » Fri Aug 12, 2016 5:37 pm

We upgraded our IQ1 and 2 backs to the newest firmware and while we were having some disconnection issues over USB3 noticed that the power settings section have changed from previous versions. Does anyone know what the USB Power Management setting does exactly? It only offers on/off and I can't find any documentation explaining it in the manuals or online. It used to be where you set auto power-off times and off/slow/fast charging from the PC, but now those settings are elsewhere. I believe we want it set so absolutely no power comes from the PC, for charging the battery or powering the back. In general we just want whatever the most stable connection is, even if it drains the batteries quicker.
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Re: What exactly is "USB Power Management"?

Postby Jon » Thu Aug 18, 2016 5:32 pm

USB Power management enables BC1.2 charging on backs with ports that support it. BC1.2 is an extension of the USB3.0 protocol which allows 1500mA of power instead of only 900mA of power simultaneous to data transfer.

What does this accomplish? USB3.0 on its own does not have enough power output to charge a battery in the back. With BC1.2 you can charge the battery a little bit - in practical terms your batteries should last a little bit longer with this enabled AND battery charging enabled. BUT it only works when connected to an BC1.2 usb port so you would generally need to be connected to a special BC1.2 charging hub.

If you are looking for the best overall tethering stability, keep battery charging off when using USB.
Kind Regards,
Jon Gilbert
Phase One
Jon
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Re: What exactly is "USB Power Management"?

Postby Burn Photo » Mon Aug 22, 2016 9:34 pm

Thank you for the explanation.
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