ISOUSB211DPEVM: PCB design parameters

Anwar Ali Vali Mohamed

Hi TI,

Is it possible to get PCB design details like USB2 traces width, clearance, and thickness based on DPEVM? I also notice the DPEVM uses 3-layer PCB which is uncommon.

Thanks,

Anwar

over 4 years ago

0 Koteshwar Rao over 4 years ago

TI__Guru 57145 points

Hi Anwar,

Thanks for reaching out.

Please note that the EVM ISOUSB211DPEVM is a 4-layer PCB where layer 2 mostly consists of GND planes while layer 3 doesn't have any traces or planes and hence is not listed out in the EVM user guide.

Regarding the other details you requested, I will check and share you trace width and thickness. Regarding clearance, could you please confirm if you meant to refer to the spacing between D+ and D- pins? Thanks.

Regards,
Koteshwar Rao

0 Anwar Ali Vali Mohamed over 4 years ago in reply to Koteshwar Rao

Prodigy 100 points

Hi Koteshwar,

Yes please, the spacing between the differential D+ and D- on the PCB.

Thanks,

Anwar

+1 Koteshwar Rao over 4 years ago in reply to Anwar Ali Vali Mohamed

TI__Guru 57145 points

Hi Anward,

Thanks for confirming, please find the request information below.

Trace Width: 20 mil
Trace Thickness: 1 Oz Copper (~1.4 mil)
Trace Spacing: 10 mil

The internal GND planes are used to create a differential impedance of ~90Ω on the USB lines. I hope that these answer your questions, thanks.

Regards,
Koteshwar Rao

0 Anwar Ali Vali Mohamed over 4 years ago in reply to Koteshwar Rao

Prodigy 100 points

Hi Koteshwar,

Thank you.

I tried the given parameters, but it seems the D- and D+ traces are too close to the pins next to D-/D+, like in the picture below (page 7 of DPEVM PDF document).

Thanks,

Anwar

0 Anwar Ali Vali Mohamed over 4 years ago

Prodigy 100 points

No worries, I used slightly different parameters specific for my PCB.

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ISOUSB211DPEVM: PCB design parameters