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TMS320F28334: ESD protections

Antonio Faggio
Expert 8210 points

Part Number: TMS320F28334

Hello,

 

I am evaluating to use TMS320F28334ZJZS or TMS320F28334ZJZQ and I need to increase the performance of the whole system in terms of ESD.

Apart from the analysis of external and internal lines of the board that need to be protected with TVS specific protections I would like to receive additional information and documentation on the most critical pins of the C2000 (Or if you can share a TLP profile of the pins) since the problem lies in the indirect discharges in terms of the electric field hitting capacitively the board and the C2000.

 

In this link http://www.ti.com/lit/an/spraas1c/spraas1c.pdf page 29 it is described ESD reduction guidelines but I still need more information if that is possible.

 

 

Could you please share with me additional information regarding ESD?

 

Thank you,

Fax

  • 0
    TI__Intellectual 1495 points
    In order to assess how best to assign this request to someone, can you clarify what you mean about "the most critical pins of the C2000"? Are you meaning in terms of device functionality or in terms of ESD performance? We don't typically provide detailed information on our product qualification results beyond what is in the Datasheet.
  • 0
    TI__Guru* 95315 points
    It is important to make the differentiation between component-level ESD and system-level ESD. The ESD information you see in the datasheet pertains to the former. Historically, we have seen the -TRST, -XRS, X1/X2 pins needing additional protection. That being said, any pin could act as a conduit for noise. What test standard did the ESD test conform to? I am unable to discern what we are after here. IOW, what ESD problem are we trying to solve?
  • 0 in reply to Hareesh Janakiraman
    TI__Expert 8210 points

    Hello Hareesh,

    Thank you.

    As for most critical pins I mean in terms of ESD performance and in particular could you please help me understand whether there are pins most sensitive than others so that they need more attention for ESD protections? I see that you mentioned TRST, XRS and X1/X2. Are there any additional pins requiring more protections?

    For example in the HW guide line SPRAAS1C I read: “The similar ESD protection diodes can be utilized for JTAG pins as well. Keep the loop area of critical traces (in this case, it would be JTAG, XRS, X1,X2) as small as possible”.

    In my board the JTAG connector JTAG is located 3 cm far away from DSP and only inserting the TVS diodes I was able to raise the immunity levels against ESD indirect discharges since without TVS diodes the protection level was not enough. This means that JTAG lines behaves as antennas...

    So the second question is: Are there any other sensitive lines behaving as antennas and do you suggest any guidelines to follow to protect these lines?

    Many Thanks,

    FAX