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Using two RF430s to communicate

Other Parts Discussed in Thread: RF430FRL152H, RF430CL330H, TRF7970A, TRF7964A, TRF7960A

Hi there,

I am looking to use two RF430s in order to send data from one chip to the other. Is this possible? Right now I have a single RF430 that I am able to read and write to from my smartphone, but my understanding is that this is because the smartphone is able to switch between reading and writing mode. 

Is this possible to do with the RF430? Can I set one into read-only mode and the other into write only (or send-only, I suppose is the better description)? It looks as though this card can only respond to commands, not send it's own.

Any advice would be greatly appreciated.

Thank you!

- Mike

  • Hi Mike,
     
    I was not sure what device you are using, but since you mentioned a phone and tag, it sounds like you are using something like the RF430CL330H or RF430FRL152H? Because the question is about these NFC devices, I've moved this out of the MSP forum and into the NFC forum - you should get a better answer there.

    I'm not an expert on these devices but I think that they can both send and receive, but that the problem is that they are passive (whatever is on the other side of the communication needs to provide the RF field, and then the tag just modulates that field is my understanding). This would mean you couldn't use just two of these devices to talk - you need something like the phone, or like the TRF7970A device, to generate the RF field. I think that the TRF7970A family of devices can be passive or active and can send or receive and support all different protocols - that might be more what you are looking for. Anyway, I mostly just support MSP devices, so I'll try to get one of the NFC/RFID team to confirm what I said.

    Regards,
    Katie

  • Mike -
    the RF430CL330H and the RF430FRL152H are both dynamic, but passive tags.
    Therefore, they cannot "talk" to each other over the air.

    you would need transceiver (like the TRF7970A, TRF7964A, TRF7960A, etc.) or an NFC enabled handset or tablet in the application, as you have already been doing. The handset you are using is switching between being a reader, a peer and a tag. The TRF7970A is also capable of doing this too.

    but - if you just want reader and tag relationship, you can use a subset of the TRF79xxA family - or use two TRF7970A in peer to peer mode.