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TMS320 LF2403a flash error with new revision

Loc Pham
Prodigy 200 points

Hello Everyone,

 

Our production boards have been working just fine until we get a new variant of TMS320 LF2403a, for which we are not able to program the flash. Every time we try to program (using CC v4.12 with XDS5510PP Plus) the error "unable to clear" message pops up and program status show ERROR.  Reading PWL at 0x40 returns same value but different after a reset (such as all 906E, or all 67FC, or all 23EC...) After I did some research, the error seems to indicate the flash may have been locked.  But, these are brand-new boards we got back from our turn-key assembly house, so the chip is new.

Current working version is: TMS320 LF2403APAG CA-35A9CRW

New version (not working): TMS320 LF2403APAGA CA-64A1K3W G4

Does anyone know if there is anything electrical differences between the current and new version that may have prevented the new version from being programmed?  The VccP is set at 5.21V which is still below the max 5.25V.  I am not sure what that G4 means? It is not mentioned in TMS320 Device Nomenclature, so I just post it up here hoping someone knows what it is.

The board will work just fine if we replace the DSP with current working version.


Thank you very much,

 

Loc

  • 0
    TI__Expert 8500 points

    Loc,

    The G4 symbolization means it is a "green" package (lead free). TI went to all lead free packages a few years ago. The Package Option Addendum in the datasheet defines the green package for the LF2403APAGA device as: Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material). I believe it requires a different soldering profile. Please make sure your assembly house is following that procedure.

    Regards,
    Dave Foley

     

  • 0 in reply to David Foley
    Prodigy 200 points

    Hi Dave,

    Thank you for the info. That's good to know. I will check with assembly house for that and keep everyone posted if that is the cause.  Other than that, do you think it would be just a drop-in replacement electrically?

    Regards,

    Loc

  • 0 in reply to Loc Pham
    TI__Expert 8500 points

    Correct. Other than that there should be no difference.

    Regards,
    Dave Foley

     

  • 0 in reply to David Foley
    TI__Expert 8500 points

    Note that there can be a difference in parametrics from one lot to another lot. This is totally independent of the packaging. Our parameters would still be within spec, but I have seen where some customer's designs are marginal and work for the first few lots of material received but then fail after being in production for a while due to a new and slightly different lot. I don't know that that is the problem here, but you were asking about differences so I wanted to point out that there will always be subtle manufacturing differences from one lot of material vs. another.

    Regards,
    Dave Foley

     

  • 0 in reply to David Foley
    Prodigy 200 points

    Hi Dave,


    Thank you very much for your help. With all information so far, I will check with our vendor to make sure the DSP is a good brand new part and proper soldering profile being used during assembly. Then, will check our board design for any possibility of being electrically marginal as you pointed out.

    Regards,

    Loc