开云体育

Hello!
I have a laptop with both types of USB sockets - the USB type-A and USB type-C.
When I connect ATU-10 (original N7DDC version) using the USB type-A to USB type-C cable - the connection works, the charging begins. If I try the USB type-C to USB type-C cable - there is neither the charging nor the disc mount.
The cables are OK, tested with every other device I have here.

Why is that? Is it possible to fix?
I'd like to use the USB type-C cable with ATU-10.

Regards,
Tony

Tony,

I noticed and reported this a while back. I think it is a limitation of the design. I am not a USB expert, but I looked at the schematic by VK3PE and it appears that only the USB 2.0 data lines are connected.

73,
Scott
AK5SD

Dear Scott,

Thanks for the reply. I've contacted David privately, hope he'll give an authoritative explanation.

Regards,
Tony

Hi Tony!

Devices equipped with a USB-C connector, which are power consumers, shall have the CC pins pulled down by pull-down resistors of 5.1kΩ. This informs the power supply that the device is a "sink".
I looked de the ATU-10 schematic and those pull-down resistors are omitted there. This seems to be the reason why the tuner does not receive power when using a USB-C/USB-C cable. It doesn't ask the power supply for power.
See Chapter 5 in

I'm afraid it's a design flaw in ATU-10. It seems to be a fairly common, as I own several devices with a USB-C socket with the exact same problem.

Dear Matěj!

I wish I knew that earlier, - when I modified the PCB (to accommodate TQFP chip and AD8361 detectors)!
So, as Chapter 5 tells, there should be two 5,1 kOhm resistors - from each CC pin to the ground.

Huge thanks for the information. I'll update my PCB (alas, I have it already fabricated and delivered), for the future.

Warm regards,
Tony

Tony,
Likewise wish i knew!??? I simply followed Davids original PCB.

I have updated my Sch to include the two 5k1 resistors if a PC with USC-C socket is used.?? PCB will be changed asap also.?? But for most people, I think won't be an issue.

This is how I have added the resistors, ie the pins used.?? If anybody believes this pin connection to be incorrect, please let me know.

Glenn
vk3pe

Hello!
The problem solved. Two 5k1 resistors at the fourth and tenth pads (per the picture above) did the job.

Thanks, Matěj, for the lesson!

Warm regards,
Tony

You're welcome Tony, I'm glad my input was helpful. :)

73 de Matěj OK2MTB