Thread: Amazon FireTV Stick announced
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Old 12-24-2014, 08:26 AM   #545
gweeks
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Quote:
Originally Posted by twowheels View Post
USB standard is 0.5A and the fire stick probably draws closer to 1A. Not that your USB port is underpowered, but that the stick (and many other devices) draws more than the standard allows.
USB 2.0 is 1A at 5V. Not all hosts/hubs can provide this and the spec allows for negotiation on the power draw. If a device needs more power than the host can provide it's supposed to shut down. The power extensions allow higher than that.

I'm buried in the middle of getting USB up on a new board that's using a brand new processor, so I just looked at this. We're a self powered device, but we have to get the settings right for self powered or the host and device won't talk to each other.

Greg
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