CCS/TMS320F28379D: USB cable connection - EMI

Renato Amorim Torres

Tool/software: Code Composer Studio

Hello everyone,

Today I was conducting some experiments with an inverter that generates EMI noise.

I was using the conventional USB cable that comes with the TI control card to connect with the DSP. Everything works fine until a certain current level above which I lost the connection with the DSP. I highly believe the problem is caused by EMI of the inverter.

The TMS320F28379D already have an isolation for the USB so I dont need another one, right?

Have anyone faced simmilar issues? Does anyone know if is there any special type of USB cable that can reduce the problem? Are the USB cables that comes with the control card shielded? Does it make any difference? Should I try to shield them?

I will try to find the answers and if I figure it out I will post here the solution. Meanwhile, I appreciate any help.

Thank you,

Renato

over 7 years ago

0 Renato Amorim Torres over 7 years ago

Intellectual 260 points

After changing the USB cable position (more distant from the EMI source), putting an CM choke in the USB cable and disconnecting an FPGA device that was also being connected to the computer I stopped having connection problems. The solution maybe a combination of all them or just one subset of them. I did not test all posibilities.

0 Cody Watkins over 7 years ago in reply to Renato Amorim Torres

TI__Mastermind 42195 points

Great, good to hear! Thanks for posting back.

Cody

0 Brett Larimore over 7 years ago in reply to Cody Watkins

TI__Guru 57255 points

Hi Renato,

If the issue comes up again at some point, doing some experimentation with the capacitor that crosses the isolation gap may be another option:
https://e2e.ti.com/support/microcontrollers/c2000/f/171/p/758166/2802865#2802865

Thank you,
Brett

C2000™︎ microcontrollers

C2000 microcontrollers forum

CCS/TMS320F28379D: USB cable connection - EMI