USB-C to USB-C not working, USB-C to USB-A working, have pulldowns

[anees.ahmad.jaffer]

Hi. I have a custom board design that uses USB-C in USB 2.0 mode for data and 5V power. I am aware that in order for a USB-C host to recognise the USB-C peripheral, it requires a 5.1k ohm resistor on both CC1 and CC2. I have placed these resistors on my board. When using a USB-C to USB-A cable, I am able to use the board; it gives power and data. When I use a USB-C to USB-C cable, the board does not power up. I thought it may be the cable, so I tested connecting my phone to my laptop using the USB-C to USB-C cable, and it worked. So the cable does support data and power. For interest, it's the cable that came with a Samsung A24.

Here is my schematic for the USB-C connector:

Screenshot 2024-03-20 090740.png (92.25 KiB) Viewed 1367 times

Here is my PCB design:

Screenshot 2024-03-20 090851.jpg (602.06 KiB) Viewed 1367 times

[ESP_Sprite]

That is more or less a configuration I've used extensively and it works fine for me. Are you sure all the pins on the USB connector are properly soldered down? Does it work if you flip the cable connector?

Fwiw, this is my PCB layout:

works.png (43.3 KiB) Viewed 1247 times

[anees.ahmad.jaffer]

There was an oversight on my side. The PCB assembly used 1k ohm resistors instead of 5.1k ohm. I changed the resistors, and it works perfectly now.

While I have your attention, are there any suggestions you have for the layout of my tracks? Is there anything I could do better?

[ESP_Sprite]

Don't worry too much about it. You're only working with USB1.1, which will still work OK if you route it over two parallel pieces of wet string; your layout will work perfectly fine.