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 Posted: Mon, 15th Oct 2012 12:44 Post subject: [iOS] Charge an iPad over PC USB? |
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I have a lenovo T410 and I would like to charge the iPad 3 over the USB. Wat do?
I have the necessary cable but nothing happens because Apple has some weird mA limit which is 10% over the PC USB standard?
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Werelds
Special Little Man
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| Posted: Mon, 15th Oct 2012 14:03 Post subject: |
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You could also try this; http://event.asus.com/mb/2010/ai_charger/ You don't have USB3.0 but you DO have a powered USB2.0 port which is meant for high-drain devices. So try AI Charger (works like a charm for me on my Pad2/Pod3) but, like Paul said; even without it you'll still charge.. just very, very slowly. Trickle charging is a pain in the ass.
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LeoNatan
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| Posted: Mon, 15th Oct 2012 14:55 Post subject: |
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Yep, I use that Asus thing, and it works great.
I still find it funny that a Mac Mini charges iPads no problem, but the beast at home "cannot". 
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Werelds
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| Posted: Mon, 15th Oct 2012 15:14 Post subject: |
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What's funny about it? PC's with USB 2.0 just stick to the USB 2.0 spec (whereas Macs don't, they use battery spec 1.1 (sort of, they don't fully stick to that either) which is not part of USB 2.0) and until 2 years ago there was no need for more. A PC with USB 3.0 should be able to deal with it just fine, the 3.0 spec allows up to 1.5A at 5V (or more at lower voltages) whilst maintaining data connectivity (battery spec 1.2).
I applaud Apple for including that spec, but it's just not part of the USB 2.0 spec (it was ratified in 2007, 7 years after USB 2.0 itself), so there's nothing weird about it.
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LeoNatan
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| Posted: Mon, 15th Oct 2012 17:35 Post subject: |
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I have little regard for standards, so your explanation there made me roll my eyes a little.
Also, I wonder how Android tablets charge just fine under the old spec, while iPads QQ some more about out of spec.
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| Posted: Mon, 15th Oct 2012 17:37 Post subject: |
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| LeoNatan wrote: | | Also, I wonder how Android tablets charge just fine under the old spec |
In my experience; they don't. Android phones *and* tablets, that I've seen and used (including the ones my wife has right this moment) don't charge properly, not even on USB3. They trickle charge.
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LeoNatan
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| Posted: Mon, 15th Oct 2012 17:47 Post subject: |
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I have not had problems with Android devices, whereas Apple devices are even picky about the cables. I have two cables here, one charges on the Mac Mini, the other doesn't. Both transfer data correctly.
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| Posted: Mon, 15th Oct 2012 17:52 Post subject: |
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I've got two iOS cables (one came with my Pad and the other with the Pod) and they both seem to work just fine .. BUT! I can't get the iPad 2 to charge properly on my PC, even via USB3, unless I'm running AI Charger. Data transfers are fine, no issues whatsoever, but he Pad will only trickle charge -- and it even says "Not Charging" on the power level. Same goes for my wife's Galaxy phone and Archos tablet, both only trickle charge on her laptop and the AI Charger is coded to only work with Apple devices (thanks Asus >_>)
In the end we just gave up trying to charge her Android stuff on the PC and she just uses a standard wall-mounted AC USB charger, which works fine.
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Werelds
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| Posted: Mon, 15th Oct 2012 18:22 Post subject: |
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| LeoNatan wrote: | I have little regard for standards, so your explanation there made me roll my eyes a little.
Also, I wonder how Android tablets charge just fine under the old spec, while iPads QQ some more about out of spec. |
Like Sabin says, most tablets only trickle charge (although it's odd Sabin, I didn't realise you actually had USB3 - it should be charging properly!). In the following days I believe Brian Klug from Anandtech will have an item going up about all the charging specs and details (quite looking forward to it, me r geek  ), but IIRC Apple actually shorts a couple of wires to get their chargers to do what they want - perhaps the 30-pin depends on exactly that, detecting the voltage/amperage?
And you can have little regard for standards, things would be horrible without them. We'd have an Androidian world on our hands with 27 different connections to deal with, most likely with Apple's style of monetizing it (sup 17 different cables for every little thing, all priced at 30-40 EUR a piece) 
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| Posted: Mon, 15th Oct 2012 18:31 Post subject: |
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Naw, iPad 2 (and I presume, by extension, iPad/4s/5) don't fully charge even on USB3.0. I've tried it on my own machine, my wife's USB3 laptop as well as mother in-law's PC .. still same; "Not Charging" - which isn't entirely accurate, it IS charging, just very slowly. As far as I can tell it seems to be a Windows issue mainly - keeping the output on USB3 set to USB2 spec, ie; 500mAh. AI Charger seemed to have fixed that -- even on USB2.0, as my Pad2 charges at full speed with no "Not Charging" error/statement even when hooked up on USB2.0 port as long as AI Charger is running.
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LeoNatan
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| Posted: Mon, 15th Oct 2012 18:43 Post subject: |
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I want products to work to my satisfaction. If that falls within the spec, great. If not, I don't care.
We all know how well the OpenGL, C++, Java HTML5 and CSS3 standards and drafts are doing, with all their committees.
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| Posted: Mon, 15th Oct 2012 20:19 Post subject: |
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How can windows lower the current on a port?
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Werelds
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| Posted: Mon, 15th Oct 2012 20:33 Post subject: |
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It doesn't 
The software overrides basically turn the USB ports into what's known as a dedicated charger port; USB ports usually work as a so-called charging downstream port, which does allow *some* charging, but nowhere near what the circuits in smartphones and tablets expect (up to 100 mA if memory serves)
@ Leo: Java isn't by committee, it's just like that by design
And I do get what you're saying, but when USB 2.0 was described there was nothing like what we use it for today. Keep in mind that it's 12 years old now, that's kind of like expecting PS/2 to be hot-plug-and-play just because you want it to 
USB 3.0 took far too long to become a reality (both in spec as well as implementation), Intel's speed with Lightp..err Thunderbolt is what it should've been like.
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| Posted: Tue, 16th Oct 2012 00:10 Post subject: |
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Ai Charger works like a charm, thanks!
BTW without AI charger I put it into the USB of my notebook for 8 hours. Didn't charge a single percent
Maybe the iPad 3 spend as much battery as it was charged with?
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