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Why some USB C cables work, or not, J-Link

https://alvarop.com/2025/09/j-link-compact-usb-c-issues/
31•worik•1h ago

Comments

pcdoodle•42m ago
Did I get this right? some cables have an MCU that gets power through a 1K series resistor on CC2? That MCU also sources ground through the cables GND?
fhars•29m ago
USB3 cables are black magic, anyway.
bloggie•29m ago
Yes and this is a requirement for many different connection modes. https://en.wikipedia.org/wiki/USB-C#E-Mark
alvarop•13m ago
The 1k resistor just lets the device know there’s an MCU on that line. The device would then provide power on that pin before talking to it
jrockway•29m ago
Honestly no excuse for this to be done wrong on a $400 device. They should replace all deployed units for free. (Because you know these cost $20 to make.)
userbinator•14m ago
Because no one really understands USB-C...

The price is not too surprising --- the margins are insane on many embedded development tools, although the stuff coming out of China is slowly trying to change that. The most expensive part of this device is the MCU which is around $15, but comparable ones from other manufacturers are <$5.

userbinator•22m ago
This means there’s a small microcontroller inside the cable with information on the cable’s capabilities.

More evidence that USB-C is an insanely overengineered spec. Cables should be dumb pipes, not devices with their own active circuitry. IMHO Ethernet, while not perfect, got this part right.

The only reason the signals don’t exactly match the one above is just the orientation of the cable.

This is one of the more perplexing design decisions. Was simply mirroring the contacts too simple for them? Did someone imagine a use-case where they wanted to detect the orientation of the cable? WTF.

paholg•10m ago
Ethernet doesn't support 240 W.

I am very happy that I can charge my phone and laptop from the same charger, and don't ever have to worry about whether the cable I'm using will be a fire hazard.

userbinator•5m ago
PoE has been around for longer, and while it doesn't go that high (90W --- but at much longer distances), it uses passive cables just fine.
chongli•5m ago
The cable can still be a fire hazard if it’s a cheap cable that lies about its rated wattage, no?

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