DP83869HM: routing for RJ45 ethernet connector is flipped between EVM and Datasheet

Jan Bock

Part Number: DP83869HM
Other Parts Discussed in Thread: DP83869

Hi Team,

can you advise on the customer question below. It seems that datasheet design and EVM design differ, what is the correct routing for the RJ45 connector:

During the circuit design review of the Fibre Optic development (media converter from 100Base-TX to FX) with the DP83869HM device, I noticed another discrepancy in the data sheet for the evaluation board.

Since we only need 100Mbps, I did the following wiring as described in the datasheet. TD_P_A,TD_M_A wired to PIN1,2 via Magnetics, TD_P_B, TD_M_P wired to PIN3,6 to RJ45. Since only 100Mbps is used TD_P_C and TD_M_C

and the D signals are not wired.

But in the schematic of the evaluation board and in the layout TD_A_P etc. is wired to PIN 8 and 7 to RJ45. So all signals are completely reversed which also makes routing easier.

over 2 years ago

0 Gerome Cacho over 2 years ago

TI__Mastermind 39785 points

Hello,

Thank you for your post. Please allow us 2 business days to review this.

Sincerely,

Gerome

+1 Avtar Dhaliwal over 2 years ago in reply to Gerome Cacho

TI__Expert 4740 points

Hello Jan,

I hope this message finds you well. Please follow the DP83869 datasheet recommendation for wiring as seen in section 10.2.1.2.2.1 Magnetics Connection.

Thanks,

Avtar Dhaliwal

0 Jan Bock over 2 years ago in reply to Avtar Dhaliwal

TI__Expert 3025 points

Avtar Dhaliwal said:
for wiring as seen in section 9.2.1.1 Cable Line Driver.

Hi Avtar,

this section does not exist.

Can you please correct it?

Thanks

Jan

0 Avtar Dhaliwal over 2 years ago in reply to Jan Bock

TI__Expert 4740 points

Hello Jan,

I have corrected it, sorry for the confusion.

Thanks,
Avtar Dhaliwal

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DP83869HM: routing for RJ45 ethernet connector is flipped between EVM and Datasheet