- CrackBerry Genius
03-30-12, 12:23 PM #2
- 1,805 Posts
If this helps answer your question usb 3.0 delivers up to 900-1000 ma.
- 03-30-12, 12:36 PM #3
I think you need USB 3.0 on both sides (male and female) for it to increase speed. I have two USB 3.0 ports on my new notebook pc, but I have also bought a USB 3.0 flash drive and external hard drive to take advantage of the extra power.
- CrackBerry Genius of Geniuses
03-30-12, 12:56 PM #4
- 9,328 Posts
I added a USB3 card to one of our backup servers to speed up transfers. It has improved the throughput even to USB2 drives, but that's probably because it is doing it's own work and not sharing off the motherboard. So I don't know if that would help if it is built in.
I've never tried to charge anything. I'll see if I can try it later and use Battery Guru to take some readings. USB2 usually puts out about 500 ma, so if USB3 is 900-1000, then it should charge twice as fast, but still not up to the 1800 ma the standard PB charger puts out.
- CrackBerry Genius
03-30-12, 01:27 PM #6
- 1,805 Posts
Its reasuring in that you said you've noticed an increase in transfers even to 2.0 devices. I pretty sure its not enough to blister but any increase helps. The increase your seeing might even be the bottle necks have been taking out. Whatever it is it allows more data in the same amount of time.
I'll tell ya this, its aggravating watching video data tranfering from a 2.0 drive to 2.0 usb port into disc burning software. Takes forever to fill the buffer. Tbis is just one of those times you see data cross a cable and how painfull it is. Lol
- 03-30-12, 04:49 PM #9
I have 1A usb ports on my computer, the PlayBook completely ignores the extra juice .. iPod, iPad, TouchPad all charge faster on them though. Then again, that was with my first PlayBook, which had it's USB connector completely fail after 7 days, so that may not be indicative.
- CrackBerry Abuser
03-30-12, 05:26 PM #10
- 219 Posts
For most implementations, you get 500mA output. If the devices wants more current, it has to ask for it. Not all USB chargers and devices follow the standard.
In summary, it's become a lot more complicated and less interoperable.
For the PB, get the rapid charger and give your PB's delicate micro USB socket a break.
- 01-04-13, 06:04 PM #13
Just adding this here (copy/paste from Blackberry Knowledge Base) with regards to a USB 2.0 port reference. It does not mention 3.0 but the port on the PB is 2.0.
With the upgrade to PlayBook OS 188.8.131.522 the following message may be displayed when connecting the Playbook to a PC using the micro-USB cable:
Unable to charge battery with connected source
This message is displayed because the voltage provided is insufficient for charging. The USB voltage is limited to 384mA even if the maximum tolerance is 500mA. The voltage is limited to 384mA by design to avoid violating the USB specification which states USB devices cannot draw more than 500mA from the USB port.
KB article: KB27705-BlackBerry PlayBook battery power charge, discharge characteristics, and guidance on extending battery life
- 01-04-13, 07:51 PM #14
As mentioned, Rim added a warning message on a recent upgrade but it probably did not change the essentials of the pc-usb capacity.
- CrackBerry Genius
01-08-13, 12:56 PM #17
- 3,524 Posts
- 01-08-13, 04:34 PM #18
The output of the standard Playbook charger is 5V at 1800 mA (~9 watts).
The output of the Rapid Charger is 12V at 2000 mA (~24 watts).
A USB port (2 or 3) puts our 5V at 384 mA (~1.92 watts) at most, usually less.
When connected to a USB port you are trying to charge the Playbook with < 1/5th the output of the standard charger.
It's close to the difference between trying to read a book under a 100 watt bulb, a 40 watt bulb or an 8 watt bulb.
- 01-08-13, 04:50 PM #20
This is pure speculation, but...
One thing you can try is to plug in the USB 3.0 cable only half way into your computer. The microUSB side to the Playbook should still be plugged in all the way.
Basically, the power connections on the inside of the usb connector are longer than the data connections. If the Playbook detects that it's a USB port, it may try to only draw 500mA. But if it detects there is no data, it will try to draw max power and POSSIBLY (might or might not work), draw up to 1A or 900mA or whatever the USB 3.0 port can provide.
You want to get it far enough in that the power connections meet, but the data connections do not.
Another way is to simply tape a piece of paper blocking the data pins, but just be careful not to get tape stuck on the inside of your USB ports.
This is one way you can get a phone to charge through USB, without having it try to connect to the computer.
- 01-08-13, 08:52 PM #24
The only reason it usually doesn't seem to be charging, is that you're using more power than you're charging, so the battery gauge shows as either steady or decreasing slowly.
- CrackBerry Addict
01-08-13, 09:22 PM #25
- 518 Posts
The problem is that the PB's port is only USB 2.0---so it cannot negotiate to the 900mA charge current available on a USB 3.0 port. As a result, USB charge current is limited to 500mA @ 5V or 2.5 watts. Most PB users exceed 2.5W when they are actively using the device, so USB charging can only occur when off or in standby.