And finally the stupid pin assignment. You have up to 20V right next to a data line that goes to either an SBU pin or a CC pin, and a tin whisker or a grain of conductive dust can send 20V right into a 3.3V logic chip.
OT: I've also inserted a type A plug into an Ethernet port (apparently without being able to see it under the desk), and I wonder why it's not enumerating...
type C is just a physical connector for usb 3.0 and up
type C is just a physical connector for usb 3.0 and up
You also gets USB type-c in USB 2.0 flavor and that also includes cables.
I don't mind it. I've had zero problems despite the total mess. This is the thing that annoys me:
Oh and the USB type A neatly fits in the ethernet hole on some laptops, if you're a fucking retard and you ram it in there hard enough. I've seen that at least 8 times this year already.
type C is just a physical connector for usb 3.0 and up
You also gets USB type-c in USB 2.0 flavor and that also includes cables.
Its easy to imagine lay people will starting to shout out loud at the net ..... fake usb cable !
Its so slow to charge !
Oh yes the 100W over USB idea. Whatever engineer pitched that one in the meeting must have been high on something.
While I agree that the implementation may not be ideal, the idea is certainly reasonable. (Though frankly, the proliferation of crappy no-name cables isn’t the designers’ fault. USB has always required certification, after all.)
I mean, FireWire provided what, 45W of power? And it worked, and worked well. USB’s meager power availability was a huge downside for a long time, and the proliferation of proprietary high-power USB “standards” was the result. Or hacks like the dual-headed USB cables for external drives, that draw power from two USB ports.
While I agree that the implementation may not be ideal, the idea is certainly reasonable. (Though frankly, the proliferation of crappy no-name cables isn’t the designers’ fault. USB has always required certification, after all.)
I mean, FireWire provided what, 45W of power? And it worked, and worked well. USB’s meager power availability was a huge downside for a long time, and the proliferation of proprietary high-power USB “standards” was the result. Or hacks like the dual-headed USB cables for external drives, that draw power from two USB ports.Proper design takes human behaviour into account. It's not as if cheap Chinese knockoffs weren't a thing when they came up with this. That should have given them pause and motivated them to come up with a very robust design that can deal with most of that.
It's not like devices blindly pull high current. They first negotiate with charger or computer and roll back if there is high voltage drop. About crap cables, it's not problem existing solely for USB. For example, in local electronics shop I purchased fake C13 mains power cord with super thin wires, maybe good for 1-2A current.
I know power is being negotiated, but I don't think it takes the actual physical wire into account. It would be good to have the system monitor a sudden rise in resistance or something, indicating a wire running hot.
As for >500mA devices like phones they simply try to take as much current as possible until they can see the voltage drop too much(usually around 4.5V) at that point they back off the current.
Phones usual looks for special coding on the data pins, most other devices just draws the current.
Phones usual looks for special coding on the data pins, most other devices just draws the current.
True some phones check for certain things before attempting to pull >500mA. This is usualy the data pins shorted together or the apple approach of having a voltage divider on the data pins. But even when signaled to go in to this high power mode it will still reduce the current if the voltage sags so cheap high resistance cables still slow it down.
Then there is also Qualcomm QuickCharge standard. That instead uses digital communication over the data pins to allow the phone to tell the charger what it wants. Allows for up to 20V 60W to be output from the charger provided the charger is capable. This is separate from the USB 3.0 20V charging thing.