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# 108503 30-Aug-2012 13:12
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From the output specifications (5V @ 2.1A) the two adapters appear the same, however, the Tab knows when it's not connnected to it's own charger and does not behave when connected to an iPad charger, how does it know? Is there a signal in the USB that advises the Tab that it's connected to a Tab charger?

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  # 679337 30-Aug-2012 16:23
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You can charge a Tab from any USB port, as you can an iPad (although it may charge very slowly).

My Tab frequently gets charged from either a USB hub, a HP Touchpad charger and sometimes even the proper Samsung charger.

Maybe the iPad charger doesn't have the data pins connected and that's confusing it somehow?

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  # 679378 30-Aug-2012 17:05
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The data pins are supplied with various voltages to notify devices what rate to charge at. The standard factory charger will provide the correct voltage to charge at maximum current for a given device. Some 'compatible' chargers will also provide the correct voltages to the data pins, but it would seem this hasn't become an industry standard by the looks.


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  # 679456 30-Aug-2012 20:33
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The industry standard is that both data pins are connected and the charger has a current limit on the power supply at the max it can supply.

Apple did their own thing and have voltages on the pins to signal the adapter wattage and the adapter stays outputting 5v rather than a current limit that will allow that to sag to whatever the device being charged needs.

The current limiting means that funky stuff happens if you try plugging a hub or Y cable into a charger and charge 2 devices off it.


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  # 679712 31-Aug-2012 13:07
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thanks for the insight.

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