USB and power

I've been having problems connecting USB devices to my (Dual G5) Mac. How do the power outputs on the USB sockets differ? I've put in an internal Belkin 4-way USB card, but I get low power warnings if I plug my iPod into it. My Wacom tablet works ok on it, as do several other devices. I've also got a 7-way external USB hub connected via one of the Mac's rear sockets, which doesn't provide enough power for anything, I can only connect self-powered devices to it (the hub has it's own external power supply). Everything works ok from the front USB socket.
I presume the various sockets I've got connected derive different power, can anyone advise on the most efficient way to connect USB devices?
Cheers
Steve

Quote
In all new models?
Not necessarely.
Quote
in MSI mainboard like P35-Neo2 FR, does the usb power down or not when I shut down the pc? In Asus, Abit and Gigabyte mainboards, for example, usb remains always on.
This has nothing to do with manufacturers/brands but with the specific board model in question.
Are you looking for a board that supplies power to the USB ports when the system is shut down or for one that doesn't? Try to be more specific about your question that makes it easier to give you an answer.

Similar Messages

HT3180 I turned on my apple tv and there before me on the screen was a picture of the apple tv with the micro usb and power lead in with the usb side pointing to the blue itunes logo! I think its telling me that it needs some kind of update ! help

I have tried reseting it through itunes ! But it does not recognise the apple tv and the itunes hasnt got any apple tv tabs? help

It is telling you to restore by connecting to iTunes. Did you follow the steps exactly?
Unplug all cables, then connect micro usb. Make sure to connect directly to the computer and not a leyboard port or USB hub.
http://support.apple.com/kb/HT4367?viewlocale=en_US&locale=en_US

I have pluged a portable battery to the USB and my macbook pro stopped working after that, right before it shut down there was a message on the screen that said something like " USB device is withdrawing so much power, please disconnect and connect again?

I have plugged a portable battery to the USB and my macbook pro stopped working after that, right before it shut down there was a message on the screen that said something like " USB device is withdrawing so much power, please disconnect and connect again?
if the device I connected have caused this, shouldn't the macbook itself have some type of protection that should prevent this from happening.
because when I took it to an apple certified maintenance shop, the guy said that now it could only run while connected to the power. it won't run on batteries. and that I have to change the motherboard.
can I just replace the damaged part only, would apple consider this as a design issue and they could pay for it, or should I just buy a new motherboard for 800$.
Help.

BB1B2,
The problem is in finding a tech shop that will/can do board level repairs on Macs. They are few. And I certainly wouldn't spend $800 on a new logic board - I would replace the computer if I had to pay that much!
You could call around to a few repair shops and see if they feel competent to isolate the problem and do a board level repair - but I'm afraid, in the end, that your search will be futile.
Sorry,
Clinton

My kid just got an iPod 5th gen (today from Santa) and it won't power up or charge. The only response is when I connect the USB and press the power button or front button the Battery appears with red line and lightning symbol. No other response at all.

Sorry about the long title.....its my first post.
My kid just got a brand new iPod 5th generation (today from Santa) and it won't power up or charge. The only response is when I connect the USB and press the power button or front button the Battery appears with red line on left and lightning symbol below. There is no other response at all no matter what I do, including holding both buttons down for extended period. My other kid got one and it works perfectly.....I have interchanged usb cables ports etc. but still no response....I would really appreciate any help.

Try:
- Reset the iOS device. Nothing will be lost
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Make an appointment at the Genius Bar of an Apple store since you have a hardware problem with the iPod. This is because as you said the same cable works with another iPod.
Apple Retail Store - Genius Bar

Apple charge me twice for the bill when I order usb cable and power adapter, what should I do now ?

Apple charge me twice for the bill when I order usb cable and power adapter, what should I do now ?
they charge me separated for the cable & adapter , and charge 51.36$ for the full bill !!!
order number *****
<Edited by Host>

Apple Store Customer Service at 1-800-676-2775 or visit online Help for more information.
To contact product and tech support: Contacting Apple for support and service - this includes
international calling numbers..

HT4623 Update message says I'm not connected to the internet. My iTunes is on and I'm hard wired to a USB for power

When I try to update my iPhone 4S I get a message that says I'm not connected to the internet. I'm hard-wired to a USB for power.

Anyone out there have a clear answer or good suggestion why I get this Message. Glenn in Chino Hills

[865PE/G Neo2 Series] Memory timings and power settings anyone?

I'm not very good with computers, so I've just played around with the timings on my memory, but have not found one stable setting as of yet.
The memory is brand new and I've tested it for errors on my brothers computer and there's nothing wrong there.
Intensive harddrive usage, dvd playing and intense downloading while listening to music are sure ways to crash my system. "..........Not less or equal" is the most common error message, but there are
many many more.
Oh, maybe I should point out that overheating's not an issue, cause I've good fans and run my computer without sidepanels.
I also like to say that I have the first generation of p4 with ht and 533fsb.
I'm sure there's something I forgot to mention but here below I'll paste the system summary that Sandra gave me.
Would be forever grateful if someone could help me out with the memory timings and power settings for my board. Setting it to "auto by spd" gives me a very unstable system, so no avail there.
I'm running the mem at 2.70 and sometimes at 2.65, since these two settings seem to be the ones with least crashes.
The Memory installed are 4*512mb ,kingston 512 kvr333x64c25 pc2700
The PSU is a Tagan "TG480-u01" 480w
Many many thanks in advance guys.
SiSoftware Sandra
Processor
Model : Intel(R) Pentium(R) 4 CPU 3.06GHz
Speed : 3.10GHz
Performance Rating : PR4118 (estimated)
Cores per Processor : 1 Unit(s)
Threads per Core : 2 Unit(s)
Internal Data Cache : 8kB Synchronous, Write-Thru, 4-way set, 64 byte line size
L2 On-board Cache : 512kB ECC Synchronous, ATC, 8-way set, 64 byte line size, 2 lines per sector
Mainboard
Bus(es) : ISA AGP PCI IMB USB FireWire/1394 i2c/SMBus
MP Support : 1 Processor(s)
MP APIC : Yes
System BIOS : American Megatrends Inc. V2.5
System : MICRO-STAR INC. MS-6728
Mainboard : MICRO-STAR INC. MS-6728
Total Memory : 2GB DDR-SDRAM
Chipset 1
Model : Micro-Star International Co Ltd (MSI) 82865G/PE/P, 82848P DRAM Controller / Host-Hub Interface
Front Side Bus Speed : 4x 135MHz (540MHz data rate)
Total Memory : 2GB DDR-SDRAM
Memory Bus Speed : 2x 168MHz (336MHz data rate)
Video System
Monitor/Panel : Iiyama A201HT VisionMaster Pro 510
Adapter : RADEON X800 Series
Adapter : RADEON X800 Series Secondary
Imaging Device : CanoScan FB630U/FB636U #2
Imaging Device : Video Blaster WebCam 3/WebCam Plus (WDM) #2
Physical Storage Devices
Removable Drive : Diskettenhet
Hard Disk : ST3160023AS (149GB)
Hard Disk : WDC WD1000BB-00CAA0 (93GB)
Hard Disk : WDC WD1200JB-00CRA1 (112GB)
Hard Disk : FUJITSU MPG3409AT E SCSI Disk Device (38GB)
CD-ROM/DVD : PHILIPS DVDR1640P (CD 63X Rd, 63X Wr) (DVD 8X Rd, 8X Wr)
CD-ROM/DVD : PLEXTOR CD-R PX-W4824A (CD 40X Rd, 48X Wr)
CD-ROM/DVD : AXV CD/DVD-ROM SCSI CdRom Device (CD 32X Rd) (DVD 4X Rd)
CD-ROM/DVD : AXV CD/DVD-ROM SCSI CdRom Device (CD 32X Rd) (DVD 4X Rd)
CD-ROM/DVD : AXV CD/DVD-ROM SCSI CdRom Device (CD 32X Rd) (DVD 4X Rd)
CD-ROM/DVD : AXV CD/DVD-ROM SCSI CdRom Device (CD 32X Rd) (DVD 4X Rd)
CD-ROM/DVD : AXV CD/DVD-ROM SCSI CdRom Device (CD 32X Rd) (DVD 4X Rd)
Logical Storage Devices
1.44MB 3.5" (A:) : N/A
Hard Disk (C:) : 149GB (101GB, 67% Free Space) (NTFS)
Xp (D:) : 112GB (2.1GB, 2% Free Space) (NTFS)
Big (E:) : 93GB (9GB, 10% Free Space) (NTFS)
Jimjimjim (F:) : 38GB (2.1GB, 5% Free Space) (NTFS)
Bologna_2 (G:) : 3.9GB (UDF)
CD-ROM/DVD (H:) : N/A
Bfv_3 (I:) : 486MB (CDFS)
Doom 3 roe (J:) : 650MB (CDFS)
Sims2ep1_1 (K:) : 650MB (CDFS)
Bf2 dvd (L:) : 1.9GB (UDF)
CD-ROM/DVD (M:) : N/A
Peripherals
Serial/Parallel Port(s) : 1 COM / 0 LPT
USB Controller/Hub : Intel(R) 82801EB USB Universal Host Controller - 24D2
USB Controller/Hub : Intel(R) 82801EB USB Universal Host Controller - 24D4
USB Controller/Hub : Intel(R) 82801EB USB Universal Host Controller - 24D7
USB Controller/Hub : Intel(R) 82801EB USB2 Enhanced Host Controller - 24DD
USB Controller/Hub : Intel(R) 82801EB USB Universal Host Controller - 24DE
USB Controller/Hub : USB-rotnav (hub)
USB Controller/Hub : USB-rotnav (hub)
USB Controller/Hub : USB-rotnav (hub)
USB Controller/Hub : USB-rotnav (hub)
USB Controller/Hub : USB-rotnav (hub)
USB Controller/Hub : USB-enhet (sammansatt)
USB Controller/Hub : Stöd för USB-skrivarport
FireWire/1394 Controller/Hub : OHCI-kompatibel IEEE 1394-värdstyrenhet
Keyboard : Logitech HID-Compliant Keyboard
Keyboard : HID-tangentbordsenhet
Mouse : HID-compliant MX310 Optical Mouse
Mouse : HID-kompatibel mus
Mouse : HID-kompatibel mus
Human Interface : Logitech WingMan Force 3D USB (HID)
Human Interface : HID-kompatible konsumentkontrollenhet
Human Interface : HID-kompatibel enhet
Human Interface : Logitech Virtual Hid Device
Human Interface : Logitech Virtual Hid Device
Human Interface : Logitech USB MX310 Optical Mouse
Human Interface : Logitech WingMan Force 3D USB
Human Interface : USB HID (Human Interface Device)
Human Interface : Internet Keys USB
MultiMedia Device(s)
Device : Audigy X YouP-PAX A4 v1.00 Audio Driver(WDM)
Device : Creative Game Port
Device : Pinnacle PCTV Stereo PAL Capture Device
Printers and Faxes
Model : Microsoft Office Document Image Writer
Model : Canon PIXMA iP4000
Model : Adobe PDF
Power Management
AC Line Status : On-Line
Operating System(s)
Windows System : Microsoft Windows XP/2002 Professional (Win32 x86) 5.01.2600 (Service Pack 2)
Network Services
Adapter : Intel(R) PRO/1000 MT Desktop Adapter #2

Thanks for your answers.
Danny: 1. Yes, I've put my memory in my brothers computer, and ran memtest there, and it came out ok, but on mine it crashes almost instantly.
2. Yea, I have 2 fans blowing into the case and one out, so airflow is good, cpu is also cool and seems to be happy ;-)
Geps: I can't say I understand all these numbers but there are som specs here as an example, Tagan TG480-U01 480W ATX
I can't imagine that this psu ain't enough, and if so.....I've been had by the dealer.

MBPro w/Mini DisplayPort to Cinema Display w/only USB and Firewire ports?

I've searched the threads for something that will explain what kind of cable I need to use my Cinema Display with my MacBook Pro, and I'm not finding anything. The MacBook Pro has the Mini DisplayPort for video out, and the Cinema Display's only ports are two USB and two FireWire.
All of the video cables I've seen in the online Apple store are either Mini DisplayPort to DVI or Mini DisplayPort to VGA, neither of which would work. Tech support told me that the computer and the display are compatible -- can anyone tell me which cable I need?

I have been using the display for several years, connected to my G4 PPC Mac Pro. Now that I have a new MacBook Pro, I was thinking of getting rid of the tower and simply using the laptop.
The cord coming out of the back of the display is connected to the tower with both the DVI plug and two USB plugs. It didn't occur to me to look on that cord because my understanding was that there was a port on the display itself, and I always think of that cord as simply a power cord.
I understand getting a DVI-to-Mini DisplayPort converter cable, but the Cinema Display is apparently powered by the Mac Pro tower. Would a laptop be able to power the Cinema Display? And would I have to connect both USB plugs to the laptop? That would take up both of the MacBook Pro's USB ports.

Can USB port be used for USB fan power?

I’m considering helping with the heat issue by getting a Targus 2 fan laptop chill pad. On sale at walmart.com for about $16 + shpg.
Problem is that it is powered by USB and I don’t know if the USB port on the ATV will supply the minimal power that it requires.
Anyone have a clue about this?
24” iMac Intel Core 2 Duo Mac OS X (10.4.9) 2.33/2GB RAM/256MBV/500/WIKM

Please forgive my impatience with this question.
I remembered that I have a Kensington light. Fly light I think it is called. Anyway, I hooked it to the ATV and it worked.
So the answer to my post, yes it does supply power. Sorry that I didn’t think to check it before posting.

Ongoing crashing and power issues (late 2011 MBP)

Hi everyone,
I'm having some really irritating ongoing issues with my 15" unibody MBP, which I purchased new from Apple in Dec 2011. All okay 'til now apart from a hard drive replacement in May when the other one suddenly died (no reason given).
What's happening is that I will be doing some low key activity - internet etc (not overheating nor fans on) - and it will suddenly switch off in a second, almost like it's short circuited. Nothing like the kind of delayed, slow shut down when running out of battery, just a ping without a 'ping'. It then won't respond to being turned on via power button, the battery lights on the side won't light up, and the magsafe light is also off and not charging. This has happened four times now.
1) First time (late June), I was watching a video on the net, mbp plugged in at wall, at least 80-100% charged. Went to connect my iphone via usb, got as far as plugging the usb (unattached to iphone) and it went off immediately. No response as above to anything. Took it to the Apple store the next day, no response to being plugged in there so they theorised that it was the logic board and took it in overnight. The next day I get a phone call from one of the techies backstage saying he'd gone to plug it in and after about 20 mins it began to charge up fine, albeit completely drained of battery. He said he'd done a hardware test etc and everything appeared fine. So I went to get pick it up, they replaced the magsafe saying that must have been the source.
2) Less than a week later, it happens again, this time nothing attached to the usb, and as far as I know before it shut off, charged/charging in wall. No response for at least a day at home of me trying it in various power outlets etc. Just dead to the world. I take it to the genius bar the next day, they plug it in with one of their chargers and it lights up immediately, once again saying it'd been fully drained of power. Again they do a hardware test in front of me, show me everything is fine. This time they replace the plug end of my charger and send me off.
3) Two weeks later (last Monday 9th), I go in to my room and find it on my desk dead to the world. Plugged in, this time in a different house (so no chance of faulty wiring in walls of first). I can see a dim flickering light in magsafe but not enough to charge it, it seems. Won't respond to my attempts to turn on nor plug in around the house. On Thursday its still unresponsive, so I travel 2 hours on the train to my nearest Apple store, only for it to light up soon as they plug it in at the bar, and once again 0% battery. Guy tells me that it'll be my SMC 'getting confused' because I don't shut it down enough (I mostly let it sleep). He says it starts working again after 2 days because the SMC must be resetting itself somehow in its hibernation (?????). I take it home, start making a conscious effort to shut it down once or twice a day when I know I won't be using it. I also installed the recent OS and firmware updates.
4) Saturday night (tonight 14th). On the internet in bed with phone plugged in via USB, I unplug phone on phone end and it happens again. I can't turn it on, dim green flickering in magsafe, no lights on side of mac.
I honestly can't afford the money nor the time to keep travelling to Exeter only for it to charge soon as I put it down (magic touch of the apple store circuitry/staff I guess).
I can't reset the SMC as it won't turn on either way - I've tried this every time its happened, under the direction of applecare phone support and it doesn't do anything for a dead machine. Along with all the other keyboard combos they suggest. The only thing that 'cures' it is 2 or 3 days of being completely unresponsive, and then spontaneously deciding to charge like nothings happened beyond a battery drain, usually in the store.
What can I do? Whenever I go to the Apple store it works fine and I look like an idiot, plus they checked the hardware (incl the logic board) the first time. Could they have missed something? I spent so much money on this thing, I almost feel like I've been given a dud and they don't believe me enough to replace it.
TIA,
Thomasyn

You've documented your symptoms pretty well - put it in a document and present it to the Apple Store 'genius'. I would insist on a logic board replacement and a battery replacement. I feel as if you have a dud as well (the hard drive dying so soon, the problems you're describing, etc.). Apple will have a log of your AppleCare calls so make them frequently.
Before going back to the store, call AppleCare again with your symptoms so that they can document them. Let them make your appointment at the Apple Store.
Good luck,
Clinton

Upgrade video card and power supply or upgrade my pc?

I have a :
HP
Series Pavilion Model M8530F(KT334AA) Type Media Center / HTPC Processor AMD Phenom X4 9550(2.2GHz) Processor Main Features 64 bit Quad-Core Processor Cache Per Processor 4 x 512KB L2 Cache Memory 5GB DDR2 800 Hard Drive 750GB 7200RPM SATA Optical Drive 1 SuperMulti DVD Burner with LightScribe Technology Graphics NVIDIA GeForce 9300GE with Hybrid SLI Technology with 256MB dedicated video memory, DVI and HDMI capabilities, and support for Microsoft DirectX 10. Up to 1919MB Total Available Graphics Memory as allocated by Windows Vista Audio High Definition audio Ethernet Integrated 10/100/1000Mbps network interface Keyboard HP multimedia keyboard Mouse HP optical mouse Operating System Windows Vista Home Premium 64-bit Software Included Photo and Video
muvee autoProducer Basic: Automatically create professional looking home videos and burn to DVD
Entertainment
Cyberlink DVD Suite Deluxe: Automatically fix and edit videos and create CDs and DVDs. Edit, burn and archive data to discs.
Productivity
Microsoft Works 9: Includes a word processor, spreadsheet, database and calendar
Microsoft Office Home and Student Edition 2007 Trial: 60-day trial version
Adobe Reader 8: Read and print PDF file
PC Security
Norton Internet Security 2008: Protect your PC out of the box (60 days of complimentary live updates)
Online Services
Easy sign-up to major dial-up and broadband Internet Service Providers:
- MSN dial-up (offer included)
- NetZero Dial-Up (offer included)
- NetZero Accelerated Dial-Up (offer included)
- Juno Turbo Dial-Up (offer included)
- High Speed Internet Services Comparison Shopping
Motherboard Chipset NVIDIA GeForce 8200 Chipset
CPU CPU Type Phenom X4 Installed Qty 1 CPU Speed 9550(2.2GHz) L2 Cache Per CPU 4 x 512KB CPU Socket Type AM2+ CPU Main Features 64 bit Quad-Core Processor
Graphics GPU/VPU Type NVIDIA GeForce 9300 GE Graphics Interface PCI Express x16
Memory Memory Capacity 5GB DDR2 Memory Speed DDR2 800 Form Factor DIMM 240-pin Memory Spec 2GB x 1 & 1GB x 3 Memory Slots (Available/Total) 0/4 Maximum Memory Supported 8GB
Hard Drive HDD Capacity 750GB HDD Interface SATA HDD RPM 7200rpm
Optical Drive Optical Drive Type DVD Super Multi Optical Drive Spec SuperMulti DVD Burner with LightScribe Technology
16x DVD±R, 8x DVD+RW, 6x DVD-RW, 8x DVD+R DL, 4x DVD-R DL, 5x DVD-RAM, 16x DVD-ROM, 40x CDR, 32x CDRW, 40x CD-ROM
Audio Audio Chipset Integrated
Communications Modem 56K LAN Chipset Integrated LAN Speed 10/100/1000Mbps
Front Panel Ports Front USB 2 Front IEEE 1394 1 Front Audio Ports 2 Card Reader Front panel 15-in-1 memory card reader: supports SmartMedia, xD, MultiMedia Card, Secure Digital (SD), Mini Secure Digital, Compact Flash I, Compact Flash II, IBM Microdrive, Memory Stick, Memory Stick Pro, Memory Stick Duo, Memory Stick Pro Duo, RSMMC, MMC Mobile, MMC+
Back Panel Ports PS/2 2 Video Ports 1 DVI, 1 HDMI Rear USB 4 Rear IEEE 1394 1 RJ45 1 port Rear Audio Ports 6 ports S/P DIF 1 port
Expansion PCI Slots (Available/Total) (2/3) PCI-E x1 slots
(0/1) PCI-E x16 slot
Mouse Mouse Type HP optical mouse
Keyboard Keyboard Type HP multimedia keyboard
Physical Spec Dimensions 16.54" x 15.16" x 7.60" Weight 32.00 lbs.
Manufacturer Warranty Parts 1 year limited Labor 1 year limited
Sorry for the long copy and paste. I read that I can upgrade the video card and power supply. But atm when I play world of warcraft at ultra settings, I tend to lag really bad in the new instances with the new cat expansion that came out. I wanted to know if I should upgrade the video card and power supply for better performance or just upgrade my whole pc tower. Fyi, I am running a Acer X243w lcd flat panel monitor if that helps too.

My brother has a high end laptop with a built in, high end gaming video card (I forget which one). He's able to run the game on full-on Ultra.
I have an integrated video card which games the game on.. 'cartoon'.. mode. It's lower then low. When someone shoots a powerful spell at me, I go into a DOS Prompt. (not really, but it's pretty bad).
Funny thing is, I can still kick my brother's butt in any PVP match he wants to set up.
But I guess his graphics are pretty....
As for which video card works best, I'd have to do some research. After that graphics update they did with CAT, it's kind of a toss up again.
I am a Bestbuy employee who volunteers on these boards on my own time. I am not paid for posting here, and you should understand that my opinions are exactly that - opinions. I do not represent Bestbuy in any way.
: Open Mailbox

My ipod will only charge on the docking station. says it has a full charge but when I take it off the docking station it says battery is low so I've plugged it into the usb and plugged it into my wall outlet but it is still not charging. Help?

my ipod will only charge on the docking station. says it has a full charge but when I take it off the docking station it says battery is low so I've plugged it into the usb and plugged it into my wall outlet but it is still not charging. I'm not sure what generation it is, its an 80GB. Help?

The battery is possibly unable to take as much power as a normal battery. It may need a replacement battery.

Battery icon dose not showing when i plug in to usb or power

battery icon dose not showing when i plug in to usb or power? and not charging when phone is on

I would try another cable or try the cable in another ios device
to verify if the cable was broken or your iphones connector is

Hp dv7 dies need to removed and power disconnected to re start but it stats up s a full crash in dos

hp dv7 with new Factory HP battery , when crashes it needs battery to be removed and power diconnected to re start but it stats up into a full crash in dos asking what type of starup is required
Please advise
clive

Hi @CliveBeattie ,
Thank you for visiting the HP Support Forums and Welcome. I have read about your HP Pavilion dv7 4115TX Notebook and having an issue with the new HP battery . Here is a link to test and calibrate the battery.
Please note remove any and all USB devices. Disconnect all non-essential devices, as these could cause some issues.
Plug the power adapter directly into a functioning wall outlet. Do not plug it into a power strip, surge protector, or secondary power source as this could cause and issue.
Hope this helps.
Thanks.
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping!

It is possible to charge an iPad3 over USB and transmit data over USB at the same time?

Hello,
it is possible to charge an iPad3 over USB and transmit data over USB at the same time?
If yes, how?
Thanks
Best regards

OK!?
That is right that the USB data oins are not connected to +5V pin.
But i found a description for a self built power supply for iPad.
http://timothyb.net/DIY_iPad_2_USB_Charger.html
and
https://www.mikrocontroller.net/topic/262610?goto=2726627#2726627
The description say: data pin D- need a voltage level of 2V and D+ 2,857V
when the data pins have this special voltage levels and VCC has +5V only then the iPad is charging.
The voltage "D+/D- coding" is the key for the iPad to charge.
OK now back to my problem.
The regular USB data pin voltage level is 0,3 - 3.,0 voltage. When the iPad is charging the data pins have this special voltage level. Now i try to transmit data over the usb data pins with the. Normaly the USB port transmit the data with a voltage level of max. 3V.
And here my problem. The higher voltage level at the data pins cares therefor that the iPad stop the charging.
Is that correct?

USB and power

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