USB HHSDPx/HHSDMx impedance matching

Discussion around products based on ARM Cortex-A5 core.

Moderator: nferre

mikepro
Posts: 27
Joined: Thu Jan 23, 2014 9:31 pm

USB HHSDPx/HHSDMx impedance matching

Wed Dec 03, 2014 12:15 am

Hi

I do have PCB trace impedance matched to USB cable differential impedance (~90R).
As far as I know, I should also match the USB driver/transceiver impedance to the same differential impedance.

The problem is that I'm not able to find specifications for the driver pins:
HHSDPC
HHSDMC
HHSDPB
HHSDMB
HHSDPA(DHSDP)
HHSDMA(DHSDM)

Please can anyone advice, have you found the impedance specs for the usb driver pins?
Or am I missing something obvious about USB impedance matcing?


Thanks for any advice!

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