Sì, ma solo con l'iPad in modalità di sospensione.
Il iPad richiede almeno 500mA da una porta USB:
Apple peripheral devices may request more than 500 mA (Milliamps) at 5 V (Volts) from a port to function or to allow for faster charging. Such Apple peripheral devices include:
- iPad
- iPhone
- Alluminum Wired Keyboard*
Sulla tastiera cablata otteniamo le informazioni:
*When connected to a computer that supports a connection of 1100 mA at 5 V, the first port on the keyboard to have a device or peripheral connected to it that requests standard 500mA power will receive that power. At that point, 100 mA at 5 V is available through the remaining port on this keyboard. This keyboard does not support extra power out of its two ports simultaneously; it requests extra power from the host computer to provide power out of either one of its two ports, then the second keyboard port receives the standard 500mA.
Note: Apple computers and displays that were introduced before 2007 support only 500 mA at 5 V from their ports and do not offer additional power.
[ fonte 1 da support.apple.com ]
Poiché le tastiere cablate sono in grado di fornire minimo 500mA richiesto dall'iPad (proprio come i vecchi Mac possono), dovrebbe essere possibile per alimentare l'iPad. Tuttavia, non può fornire una corrente aggiuntiva che consenta una ricarica più rapida.
Tuttavia, il nuovo iPad può caricare solo in modalità di sospensione quando connesso a un hub USB a bassa potenza:
The fastest way to charge your iPad is with the included 10W USB Power Adapter. iPad will also charge, although more slowly, when attached to a computer with a high-power USB port (many recent Mac computers) or with an iPhone Power Adapter. When attached to a computer via a standard USB port (most PCs or older Mac computers) iPad will charge, but only when it's in sleep mode. Make sure your computer is on while charging iPad via USB. If iPad is connected to a computer that’s turned off or is in sleep or standby mode, the iPad battery will continue to drain.
[ fonte 2 da support.apple.com ]