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RF430CL330H: Analog Front End Issues

Luke
Expert 4080 points
Part Number: RF430CL330H
Other Parts Discussed in Thread: DLP-RF430BP

Tool/software:

Hi,

Customer has recently encountered some issues with the RF430 on their NFC tag. It seems like an intermittent issue where NFC communication is not being established during expected distances from the reader, but will establish communication outside of this range. Everything else seems to function as usual.

It would be very useful to have a better understanding of the analog front end section of the RF430. I took a look at the datasheet and there's not a lot of info. Is there a detailed block diagram or any drawings we would be able to provide? 

Thanks,

Luke

  • 0
    TI__Expert 4080 points

    Additionally, they’re also interested if we have any detail regarding how magnetization could effect the RF430, or if there is any internal section of the RF430 that could become magnetized. They are beginning to believe that their PCBA can become magnetized in a way that effects NFC communication. They have found some PCBAs that do not function as expected, where they only establish the NFC communication outside of the typical range. When they pass these PCBAs over a demagnetizer, they begin to function within the expected range. They’ve even been able to re-create the problem, by magnetizing the PCBAs again to experience the original issue.

    Do we have any insight into this issue?

    Best,

    Luke

  • +1 in reply to Luke
    TI__Guru**** 191906 points
    Luke said:
    They are beginning to believe that their PCBA can become magnetized in a way that effects NFC communication. They have found some PCBAs that do not function as expected, where they only establish the NFC communication outside of the typical range. When they pass these PCBAs over a demagnetizer, they begin to function within the expected range.

    I'm not an expert on how magnetization affects RF signals. As you know RF waves are basically electromagnetic, I'm not surprised that a nearby magnet or the PCB that is somehow magnetized to have some effect on the RF transmission. Searching the e2e archive, I'm unable to find relevant posts with similar problem. 

    Can they reproduce the problem on the TI DLP-RF430BP BoosterPack?

    Please ask to also review RF430CL330H Practical Antenna Design Guide and ensure all recommendation are taken.