Charging from a usb 3 port
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Yeah. I thought USB3 was all about power, no ?
(it'll charge just fine on a 10W usb charger)
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Um, no, USB3 has no different spec in that regard than any earlier standard. Besides, it's probably your device thinking "hm, I seem to be charged from an USB socket in a PC, better engage the current limiters so that the poor schmuck doesn't end up with a fried motherboard". It charges better from a charger because there's no handshake on the data pins (they'll generally be
shorted, groundedactually per spec linked with a resistor, or I think in case of Apple chargers broadcast some code), so it knows it can pull more (and there are current limiters on both sides anyway).
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I was extremely confused until I realized you cropped out the top of your screen for that screenshot...
Filed Under: 8 hour car trip, brain kinda fried. I no thinking so good
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Maybe it'd be better if it's a Type-C port.
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Everything's better if it's a type C port. Eh, assuming everything's type C of course. If not it's just adapter-hell all over again.
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Devices get 100mA unless they ask nicely for more, and the host can refuse.
IIRC, Apple chargers used to have proprietary resistor nets that their devices measured, in order to make sure you only buy Apple chargers
and create more landfill.They now have a data handshake between the device, charger and cable as well, because
they weren't creating enough toxic landfill wastethe resistor nets were easy to copy.
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IIRC, Apple chargers used to have proprietary resistor nets that their devices measured, in order to make sure you only buy Apple chargers
Apple chargers is simple: just few resistors. If you don’t put these secret resistors on the data lines too, you get the dreaded Charging is not supported with this accessory.
They now have a data handshake between the device, charger and cable as well
Not sure it's a handshake, but it does involve the data lines: http://apcmag.com/android-usb-charging-secrets.htm/
[Apple] decided that if an iPhone or iPad came up against a USB port with 2.0VDC on the D+ line and 2.7VDC on the D- line, that port would be an Apple iPhone (DCP) charger that could supply 1000mA of current. If the voltages were reverse (2.7V/2.0V on the D+/D- lines), it’d be an iPad charger with 2000mA maximum supply.
