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Bidirectional Communications and Power

Hunter Long61
Prodigy 225 points
Other Parts Discussed in Thread: BQ501210, BQ51025

Hello,

I have an application where I need to transfer a small amount of power over a wireless link (1W or less) while at the same time allowing for bidirectional communication. Can someone please point me in the right direction? I know that many receivers allow for RX->TX communication through load modulation, and apparently the BQ501210 can send TX->RX data (http://www.ti.com/lit/ds/symlink/bq501210.pdf, 

  • 0
    Prodigy 225 points
    Sorry, the rest of my post got cut off somehow.

    So the BQ501210 can send TX->RX data through frequency modulation, but there are no details in the datasheet about how to use this feature. I would also like to know the maximum RX->TX and TX->RX data rates that could be expected.

    Thank you very much for your help,
    -Hunter
  • 0 in reply to Hunter Long61
    Prodigy 20 points
    I need exactly the same. I know that the maximum of RX->TX is 2kbit/s, but I don't no the rate of TX->RX.
  • 0 in reply to Christian Sagstetter
    TI__Guru 65706 points
    Hi Hunter,
    The bq501210 does support bi-directional communication, however in the protocol defined by the WPC, all communication is initiated by the receiver. So, if you had a receiver which could request data from the transmitter, it would be possible to transfer data in that direction, but without such a receiver, we are not able to support this functionality.

    The bq501210 does have I2C support for managing proprietary data in both directions. Unfortunately, TI does not presently have a receiver device to take advantage of this capability.

    The bq51025 can send proprietary data to the bq501210 which you can read out via I2C on the TX, but its demodulator is not able to decode any data the TX might send in response.
  • 0 in reply to Bill Johns
    Prodigy 20 points

    Hi Bill,

    do you know a producer of receiver for bi-directional communication?

    regards

    Christian

  • 0 in reply to Bill Johns
    Prodigy 225 points
    Thanks for your reply! Where can I find information about the I2C interface for the BQ501210? I dont' see anything about the register description or command structure in the datasheet.

    Thanks,
    -Hunter