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TRF7962A: Does this part could be drop in replacement for TRF7970A?

Tess Chen
Intellectual 2675 points
Part Number: TRF7962A
Other Parts Discussed in Thread: TRF7970A, TRF7964A

Hi Team,

I have a board built up with TRF7970A. For my next project, TRF7962A is preferred and need to do evaluation. 

Does TRF7962A could be drop in replacement for TRF7970A? If yes, I can short my design cycle. 

Could you share the HW or SW changes or risk for the replacement?

Best Regards,

Tess Chen 

  • 0
    TI__Intellectual 2675 points

    Hi Team,

    I am really looking forward to your reply. Thanks.

    Best Regards,
    Tess Chen

  • 0
    TI__Genius 15890 points

    Hello Tess,

    sorry for the delayed response. I was out of office last week.

    The TRF7962A is pin compatible to the TRF7970A, but it is not a equivalent replacement.

    The TRF7962A does not support P2P, Tag type 1, 2, 3 and 4. Its specified temperature range is -20 to 85°C, whereas the TRF79770A is specified for -40 to 110 °C.

    The TRF7962A also has only 12 byte FIFO size and its SPI handling is different (see FAQ chapter 4.1 sloa248 and sloa140).

    Actually the TRF796x devices are quite mature and should not be considered for new designs. The TRF7970A and TRF7964A are recommended for new designs.

    Best regards,

    Andreas.

  • 0 in reply to Andreas Mueller
    TI__Intellectual 2675 points

    Hi Andreas,

    Thanks for your reply. I understand that there are difference for temperature and SW tags. I want to confirm that whether I can  share the same antenna design and communication connection for these two parts.

  • 0
    TI__Genius 15890 points

    Hello Tess,

    yes the antenna interface and the communication interface are the same. But as said before, the SPI protocol is a little different.

    Best regards,

    Andreas.

  • 0 in reply to Andreas Mueller
    TI__Intellectual 2675 points

    Hi Mueller,

    Thanks for your prompt reply. 

    When debug the TRF7970A, we found that the chip can only read and write I CODE SLIX series tags. The other tags (I CODE2, and other brands of unknown high-frequency chips) could only be read data and not written data properly. These tags are confirmed to be ISO 15693. These tags for testing can be read and written on other readers. Do you have any insight for the troubleshooting? Or meet some similar phenomena before.

    Big thanks for the help.

    Tess

  • 0 in reply to Tess Chen
    TI__Intellectual 2675 points

    Hi Mueller,

    May I have your update for the issue above ? Thanks.

    Best Regards, 

    Tess Chen

  • 0
    TI__Genius 15890 points

    Hello Tess,

    I'm not familiar with these types of tags.

    I'm also not aware on any ISO15693 write limitation of the TRF7970A. The only scenario I could think of is that the memory blocks on the tags were locked. But since you wrote that they are writable with other readers, then this can be ruled out, I guess.

    Are there any custom commands or proprietary commands used for writing with the other working reader? These commands might not be implemented in the TRF7970A controller firmware.

    Best regards,

    Andreas.

  • 0 in reply to Andreas Mueller
    TI__Intellectual 2675 points

    Hi Mueller,

    My customer don't find any custom commands difference for now. 

    The tag which could be write by other reader is shown below and datasheet attached here for your reference.

     edb_100005246_gbr_en.pdf

    I wonder whether you have the possibility to verify this tag could work with TRF7970A in the lab？ If needed, they could ship this tag to you. 

    Any other suggestion is welcomed. Thanks a lot for you help.

    Best Regards,

    Tess 

  • 0
    TI__Genius 15890 points

    Hello Tess,

    in the attached datasheet there is a note on password protected memory access and therefore a special firmware requirement. Could this causing the issue?

    If password protection is not an requirement you could also suggest the TI's Tag-it HF-I Standard or Tag-it HF-I Plus device.

    Best regards,

    Andreas.

  • 0
    TI__Genius 15890 points

    Hi,

    I haven’t heard back from you for a while, so I will close this tread. If you wish to continue the discussion, please post a reply with an update below (or create a new thread).

    Best Regards,
    Andreas.