EK-TM4C1294XL: Replacing Ethernet Components

Hi Wing,

Please refer to the below post that asks the similar question. I thinkt it is ok to use RJ45 with built in transformer if the UNH compliance is met.

e2e.ti.com/.../1825752

Please also refer to the system design guideline for additional information.
www.ti.com/.../spma056.pdf

Hi Charles,

I Have read the Ethernet portion thoroughly on the document, thank you. The TI "EK-TM4C129XL" schematic give a more detail answer on this, the schematic provides 2 match transformers, "HX1198FNL" and "HX1188FNL", and recommend "HX1198FNL" preferred best Ethernet performance". So I understand this transformer is critical for Ethernet performance.
If possible, I am looking for a RJ45 with build in magnetic, and the performance is not too much detreated and experimental prove. I will wait if any one else may have input on this.

Regards,

Wing Wong

The document you linked states "The Tiva™ C Series data sheets list both the part number and manufacturer's name for approved Ethernet transformer (magnetics) options. Other parts can be approved by similarity, but it is highly recommended to check with the manufacturer for their assessment of suitability."

The datasheet has no such list. The datasheet only cites the HX1188. The "similarity" is never defined. Specifications should use units of measurement.

I posed this concern to a Pulse sales rep and he didn't understand what the document was trying to say either.

Hi Peter,
I wasn't involved with the creation of the app note and neither the datasheet. Agreed that some improvements in the datasheet and the app note will clarify doubts. I think the datasheet meant to say that if the user finds any parts other than HX1188 they may do so if these parts are approved either by similarity or other means. The responsibility will lie on the users. TI cannot exhaustively lists all possible parts. As indicated in the datasheet the HX1188 proves to work the best with the built-in PHY. This is not to say others will not work.