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NUC 11 Thunderbolt port power not up to spec

comsci
New Contributor I
889 Views

As I'm not really happy with the response to my previous query: 

https://community.intel.com/t5/Intel-NUCs/Powering-Depth-Cameras-from-Thunderbolt-ports/m-p/1338195/...

 

So I thought I would investigate the issue further.

I've configured a USB-C breakout board with a 3.3ohm load (1.5A at 5v) and two ~5Kohm configuration channel pull down resistors.

comsci_2-1638789787553.png

On connecting this to either NUC thunderbolt port (either directly or via my cable) all I see is a 10ms attempt to raise the voltage to 4v every second or so. It looks like the NUC is preventing the power delivery.

 

comsci_1-1638789457700.png

 

On connecting same 'device' to my ASUS PN-1 thunderbolt ports I get a steady 4.8v

According to the Specifications the thunderbolt ports should be able to provide 3amps. They are failing with my modest requirement of 1.5A.

 

SSU output log attached.

8 Replies
DeividA_Intel
Moderator
866 Views

Hello comsci,  

  


Thank you for posting on the Intel® communities.   

  


In order to better assist you, please provide the following:  



1. Can you explain what is the device shown in your 1st picture? Is it from the NUC?

2. Did work with a different NUC?

3. Are you using the Intel® NUC 11 Pro Kit NUC11TNKi5?

4. What is the exact model of the ASUS device that worked with your camera?



Regards,  


Deivid A. 

Intel Customer Support Technician 


comsci
New Contributor I
853 Views

Hi DeividA,

 

Re 1:

The pseudo device in picture 1 is simply a USB-C breakoutboard. That is a PCB with each USB-C track exposed and a male and a female USB-C connector.

I have soldered a 3.3ohm resistor between Vcc and Gnd to emulate a device with a draw of 1.5A at 5v.

I have connected two 5.8KOhm pull down resistors between the cable config channels and ground to emulate a standard downstream USB-C device connection.

According to the Thunderbolt specs, the port should be able to provide 3 amps at 5v. It looks like the port is being shutdown even at 1.5amps which is what my cameras are stated to require.

 

Re 2:

Both thunderbolt ports show the same behaviour. I don't have another NUC with a thunderbolt port to experiment with.

 

Re 3:

NUC is NUC11TNKi5 and using the supplied power brick.

The cameras I am trying to connect are Microsoft Azure Kinect dpeth cameras with power requirements are 1.5A at 5V:
https://docs.microsoft.com/en-gb/azure/Kinect-dk/hardware-specification#power-device

 

Re 4:

The ASUS is a model PN50-E1

DeividA_Intel
Moderator
839 Views

Hello comsci, 


  

Thank you for the information provided 


  

I will proceed to check the issue internally and post back soon with more details. 


  

Best regards, 


Deivid A.  

Intel Customer Support Technician 


Ronny_G_Intel
Community Manager
799 Views

Hello comsci, 

 

If you refer to our documentation, see TPS, page #15 the Thunderbolt ports should provide 15W and 7.5W

https://www.intel.com/content/dam/support/us/en/documents/intel-nuc/NUC11TN_TechProdSpec.pdf

 

tbpower.png

From your previous report, are you connecting this camera: https://docs.microsoft.com/en-gb/azure/Kinect-dk/hardware-specification#power-device ,and are you using the following cables: https://www.ebuyer.com/822466-startech-com-usb-c-to-usb-c-cable-m-m-1-m-usb315cc1m?

What happens when the camera is connected? 

 

Regards,

Ronny G 

comsci
New Contributor I
777 Views

Hi Ronny,

 

Yes so 7.5W at 5v equates to 1.5amps which is what teh cameras claim to draw at what my pseudo device attempts to draw.

 

Upping the resistor to 6ohms (0.833A draw) and it works OK (I get 5V accross the resistor), so I think whatever protection circuitry is employed is shutting the output off prematurely when the load is 3.3ohms.

 

When I plug a camera in, I get a flashing amber LED on the camera that indicates insufficient power. On hooking my scope up to the Vcc line at the NUC end of the cable I get:

comsci_0-1639234849291.png

 

 

It looks like 5V is supplied, but 20ms after plugging in the camera the voltage drops to about 4v so presumably the camera disables itself and signals insufficient power.

Best regards,
David

David_G_Intel
Moderator
744 Views

Thanks for the update comsci, let us investigate further and we will post the updates on the thread.


Regards, 

David G 

Intel Customer Support Technician 


Ronny_G_Intel
Community Manager
727 Views

Hello comsci, 


I am running this issue by the Product Team and I will get back to you as soon as possible.


Regards,

Ronny G


comsci
New Contributor I
553 Views

For anyone else following this thread, a recommended firmware upgrade has fixed the problem

1. Please upgrade to the latest BIOS version TN0062

https://www.intel.com/content/www/us/en/download/19698/bios-update-tntgl357.html?cache=1640625648

 

Thanks for the help

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