this post was submitted on 14 Sep 2023
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How do I interpret USB PD2.0 vs PD3.0 PPS (max wattage)? (lemmy.nowsci.com)
submitted 1 year ago* (last edited 1 year ago) by fmstrat@lemmy.nowsci.com to c/askelectronics@discuss.tchncs.de
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So I'm doing some testing of USB-C cables using a tester and a constant load (I'll have another post soon with some questions on this). But before running each test, I'm checking the E-mark chip and then enumerating the charge capabilities of each to see what they report being capable of.

I'll use 3 different brands of cables as samples of my question. Power Supply (PS) 1 is an Anker 100W with PPS support. PS2 is a MacBook Pro 94W brick with no PPS support.

  • Cable A
    • Emark: 20V@5A USB3.2 Gen 2
    • Max PD using PS1: PD3.0 PPS 29W
    • Max PD using PS2: PD2.0 94W
  • Cable B
    • Emark: 20V@5A USB3.2 Gen 2
    • Max PD using PS1: PD3.0 PPS 100W
    • Max PD using PS2: Not tested
  • Cable C
    • Emark: 50V@5A USB2.0
    • Max PD using PS1: PD3.0 PPS 29W
    • Max PD using PS2: PD2.0 94W

So the question: What would be limiting Cables A and C to PPS 29W?

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