DS90UB984-Q1: eDP differential impedance

liujian zhang

Hello,

our application as below show, for the differential impedance control, how much should we followed? 85Ω or 100Ω ? or both of them are acceptable? thanks! eDP used for our project.

1 month ago

0 Hamzeh Jaradat 1 month ago

TI__Guru** 120150 points

Hello Liujian,

If you are using DP mode, it is recommended to have the traces matched to 100Ohm differential impedance.

If you are using eDP mode, it is recommended to have the traces matched to 85Ohm differential impedance.

0 liujian zhang 1 month ago

Prodigy 20 points

Hello,

here we are using eDP mode, and i want to know if we can use 100Ohm differential impedance instead of 85Ohm, and what's the affect?

could you pls give some explanation regarding below information(which highlight by red box), thanks!

0 Hamzeh Jaradat 1 month ago in reply to liujian zhang

TI__Guru** 120150 points

Hi,

the Note in red box says, you must use 85ohm +/-15%, but if you are not using an eDP connector then you must use 100ohm instead of 85.

Are you using eDP connectors? If yes, then 85 +/-15%. If no then 100ohm

0 liujian zhang 1 month ago in reply to Hamzeh Jaradat

Prodigy 20 points

Hello,

does the eDP connectors means specific connectors? any specific requirement for the connector? we do have zif connector between two board(main board and LCD board), but i'm not sure this zif connector same as the eDP connector? thanks!

0 Hamzeh Jaradat 1 month ago in reply to liujian zhang

TI__Guru** 120150 points

Hi,

We do not specify an eDP connector. If you are using any eDP connector you should switch to85ohm trace impedance. But if your devices are connected directly using PCB traces, then you should use 100ohm trace impedance.

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DS90UB984-Q1: eDP differential impedance