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Choosing Ethenrnet transformer for TIVA TM4C parts

Hideaki Nambu
Mastermind 9165 points

Hello, Could you advise guidelines to choose Ethernet transformer for TIVA TM4C parts?

Or, are there anything you don't recommend?
  TRX100BTH(JPC), J3011G21DNLT(PULSE), RJLUG-308TA1(TIMAG)

* The Launchpads have HX1198FNL and HX1188NL. They also should be good parts.


-n

  • 0
    TI__Guru**** 244400 points
    Hello Hideaki,

    Some of the transformers are listed in the System Design Guidelines. As long as the transformer is IEEE 802.3 compliant, care is taken during PCB Layout as per the system design guidelines document and sufficient ESD protection is built on the PCB, most of the transformers should be OK. Do note that testing the end system for IEEE compliancy is still a customer's responsibility. The On-chip PHY is IEEE Compliant.

    Regards
    Amit
  • 0 in reply to Amit Ashara
    Mastermind 9165 points
    Amit, I appreciate your response.

    > Some of the transformers are listed in the System Design Guidelines.
    Can I ask the PDF filename and page# ?

    -n
  • 0 in reply to Hideaki Nambu
    TI__Guru**** 244400 points
    Hello Hideaki

    Data sheet for the TM4C129x device, Section is "Interface Configuration"

    The Pulse HX1188 transformer has been tested and is known to successfully interface to the Ethernet PHY.

    Regards
    Amit
  • 0 in reply to Amit Ashara
    Mastermind 8695 points

    We should stop referring to single items in plural terms. There is no list of transformer options despite the System Design Guidelines for TM4C129x stating "The Tiva™ C Series data sheets list both the part number and manufacturer's name for approved Ethernet transformer (magnetics) options." (SPMA056 )

    There are no listed options. For that statement to be true in English, two or more options must be given. There is one single option. You imply you have some extensively vetted list, but in reality you have one single option used in a dev kit.

    The disappointing SPMA056 also says "Other parts can be approved by similarity, but it is highly recommended to check with the manufacturer for their assessment of suitability". There are no metrics to go along with this statement. I have no idea what I supposed to ask a manufacturer. A massive company like TE Connectivity doesn't care about my design and will not give a definitive answer on compatibility. I expect better.