What is the role of this resistor and this capacitor?

Hossein Forouzani

Hi,

I have asked the same question on the C5000 ultra low power DSPs forum. Since I don't know what is the appropriate forum to ask this question and because this matter is mainly related to the USB port, I've created this new thread.

Why this resistor and this capacitor is used in the image bellow?

This image is taken from Spectrum Digital DSK5509A schematics. J10 with 6 pins is a USB socket and the nets USB_D+ and USB_D- are connected to TMS320VC5507 usb pins.

Thanks,

Hossein

over 7 years ago

0 Aramis P. Alvarez over 7 years ago

TI__Genius 10370 points

Hi Hosseien,

Unfortunately, we do not know why the RC parallel network is between GND and Sheild. We have not seen such a configuration with type-a and/or micro-b ports with our USB parts. It might be some kind of filtering of noise, but again not sure.

I hope this helps and If this answers your question, PLEASE select This resolved my issue

0 Hossein Forouzani over 7 years ago in reply to Aramis P. Alvarez

Genius 3030 points

Hi Aramis,

I found my answer in another thread.
e2e.ti.com/.../677133

Thank you for your answer.

Regards,
Hossein

0 Aramis P. Alvarez over 7 years ago in reply to Hossein Forouzani

TI__Genius 10370 points

Hi Hossein,

I'm happy that you found the answer to your question. Since this thread is now closed, could you PLEASE select This resolved my issue

Thank you and enjoy the rest of your week!

0 Hossein Forouzani over 7 years ago in reply to Aramis P. Alvarez

Genius 3030 points

Hi Aramis,

Let me kid you that the extra points of "This resolved my issue" is achieved through the efforts of you to convince me to select that button while I found my answer some where else!

I was kidding!
Be happy and have more fun.
Hossein

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What is the role of this resistor and this capacitor?