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USB-C head-to-head teardown - Lumafield
(www.lumafield.com)
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this post was submitted on 21 Oct 2023
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Technology
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There are like 5 speed and 5 power levels. The only alternative is all cables are stupidly short and expensive.
As of USB-PD 3.1 there are now nine fixed voltages - 5, 9, 12, 15, 20, 28, 36, and 48V - and two variable-voltage modes; PPS with 3.3 - 21V in 0.02V increments, and AVS with 15 - 48V in 0.1V increments.
Combined with a few different current limits, some of these features being optional, and then doubling down with what your cable does or doesn't support, amazing anything gets charged at all.
Not to mention unhelpful names like "full speed", "hi-speed", and "super speed".