Electronics > Projects, Designs, and Technical Stuff
USB Type C connector and cable
GromBeestje:
Looking at the Wikipedia article,
https://en.wikipedia.org/wiki/USB-C#Alternate_Mode_partner_specifications
I'd say "Debug Accessory Mode" seems suitable. it gives 14 pins.
senso:
How cheap does it need to be?
I would go for Harting Push-Pull family, with the 20 pins cables, more than enough pins, robust enough, wont be mis-connected, can use bulkhead connectors on the device side, and then make custom length or buy pre-made cables:
https://b2b.harting.com/ebusiness/en/Interface-connectors-PushPull-Device-connectivity-PushPull-Signal/34750?detail=false&sewConfig=false
Inquire their rep, and they can show you some more solutions, this would be my approach, given that the end user will surprise you in how dumb they can be, and there will be fried electronics after a while..
If you want cheaper, 19 pins DB connectors, not the typical VGA, or it will be mis-used as well..
thm_w:
--- Quote from: wraper on January 19, 2020, 10:23:48 pm ---There is no electronics in the cable. Be aware that in USB 3.x cables number of actual wires is only half of the total pin count. USB 2.0 cables have only 4. GND wire usually is connected to a shield. Also if you use it, be ready that people will certainly plug something non compatible on the other end like charger, laptop, whatever. So circuit should tolerate such conditions, not blow up.
--- End quote ---
Most cables do not have electronics, maybe one resistor, however, USB-PD emarked will have some ICs. So you might want to watch out what pins those are connected to. I believe if you stick with 5V or less Vcc it will be fine.
Cables were discussed a lot in the RPL1116 thread.
Finding fully wired passive cables was hard before, but now its getting a lot easier: https://www.primecables.ca/p-356977-cab-usbcm-cm-1ma-usb-c-31-to-usb-c-gen-2-mm-cable-with-aluminum-alloy-connector-primecables#sku365277
These are a bit stiffer than typical cables.
tooki:
--- Quote from: GeorgeOfTheJungle on January 22, 2020, 12:22:43 pm ---
--- Quote from: tooki on January 22, 2020, 11:39:39 am ---Oh, I totally agree that USB-C is a clusterfuck. But using the connector for something that isn’t USB or any sanctioned extension to it is asking for trouble.
--- End quote ---
No, it isn't, nothing bad can happen if you only use PWR and D+/-. For example, you can use D+/- as TxD and RxD for a serial port, no problem whatsoever.
--- End quote ---
Will it really handle the ±25V allowed in RS-232 without damage? I kinda doubt it.
Regardless, USB-C and USB 3.x are a huge clusterfuck. This has been discussed at length on the forum and elsewhere.
GeorgeOfTheJungle:
--- Quote from: tooki on January 23, 2020, 06:15:57 am ---Will it really handle the ±25V allowed in RS-232 without damage? I kinda doubt it.
--- End quote ---
RS-232? Hello? Tooki? It's 2020 already! :)
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