This issue came up recently for a high profile new gadget that has made the transition from Micro-USB to USB-C in its latest version, the Raspberry Pi 4. See the excellent blog post by Tyler (aka scorpia): https://www.scorpia.co.uk/2019/06/28/pi4-not-working-with-some-chargers-or-why-you-need-two-cc-resistors/

The short summary is that bad things (no charging) happens if the CC1 and CC2 pins are shorted together anywhere in a USB-C system that is not an audio accessory. When combined with more capable cables (handling SuperSpeed data, or 5A power) this configuration will cause compliant chargers to provide 0V instead of 5V to the Pi.

The Raspberry Pi folks made a very common USB-C hardware design mistake that I have personally encountered dozens of times in prototype hardware and in real gear that was sold to consumers. …

Benson Leung

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