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A "dumb" device that doesn't negotiate will get the minimum 5V@100mA that the USB spec allows, dedicated chargers often decide to not drop the power after the n
by snuxoll 10y ago
A "dumb" device that doesn't negotiate will get the minimum 5V@100mA that the USB spec allows, dedicated chargers often decide to not drop the power after the negotiation window is over but a proper host device (laptop, etc.) will drop all power if a device fails to negotiate.
So yeah, if you plug something into the Macbook charger it will either not charge (dunno if it supports traditional USB power specs since it's a type-C only charger) or charge as any other charger already does.
- deleted 10y ago[deleted]
- kalleboo 10y agoRe: "dumb" devices, this is how it's supposed to work, yes, but I don't think I've ever seen a charger that won't happily dump 1A into a resistor wired over the power pins - including brand name (Apple) chargers and yes, the USB ports on a MacBook Pro. I've never seen a modern device supply only 100 mA. For devices that DO attempt to negotiate, yes in those cases usually you'll see it work according to spec. I haven't tried USB-C yet, it would be interesting to see if devices have gotten stricter.