t4.1 usb-c breakout not always recognised

M

marinabolognese

Member
hi, ive got a t4.1 d+ and d- lines being sent to a usb c breakout i made with a STF202-22T1G and usb c receptacle with 2x 5.1k res to gnd on cc pins..
on one laptop its fine and functions normally but on another it doesnt even get read but does get vbus power, any ideas on why this is?
thanks
 
Did you wire the D+ and D- to both pins on the USB-C so that the cable can be inserted in either orientation? If not, perhaps you just oriented the cable differently during your testing which broke the connections. D+/D- should look something like this.
1721178609769.png
 
Looking at the part spec, it looks like it is designed for USB 1.0, so only supports up to 12Mb/s which would be too slow for the Teensy USB 2.0 port that can run at up to 480Mb/s so that is no doubt affecting signal quality.

Teensy doesn't use anything like this between the micro-B USB and the processor, so I don't use anything between the USB-C and the Teensy4.1 USB pads. In my setup, I am basically just replacing the micro-B mechanical connector for the USB-C connector. I have seen no issues with moderate use.
 
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