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How to identify the wireless transmitter ID through the receiver.

Anthony McDonald
Prodigy 50 points
Other Parts Discussed in Thread: BQ51021, BQ51221, BQ501210, BQ500212A

I'm working on a project that will require the wireless receiver to identify the charging station it's interfacing for power.  The Qi wireless power transfer specification states that power transmitters are to report an identification packet (using packet header 0x71) in the communications logical layer.  The contents of this packet are to be "sufficiently unique", and so I assume that a wireless receiver might be able to identify a transmitter based on this packet.  Can a host interfacing to the I2C port of the BQ51021 or BQ51221 read the contents of this packet through the registers, and if so, which registers?  If not, is there any other information available in the I2C register map that can provide information about the charging station so that it can be identified?

  • 0
    TI__Genius 14890 points

    Anthony,

    The 0x71 header is sent from the RX to the TX.  

    With WPC v1.1, there is no way for the communication to go from TX to RX.  The WPC v1.2 will allow that communication.  See the bq501210 folder for information.  It will release later this month.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Prodigy 50 points

    Hi Dick,

    I see you are right: Header 0x71 is for sending the Rx ID to the Tx, not the other way around. In that case, can any of TI's transmitters read and report the Rx ID from header 0x71 to a host? I see the bq501210 Tx device includes an I2C port. But the datasheet doesn't indicate the port's use. Likewise, can the BQ51021 or BQ51221 receivers report their own ID to an I2C host?  I don't see registers for this in the register map, but I do see "mailbox" registers.  Would they contain the ID?

  • 0 in reply to Anthony McDonald
    TI__Genius 14890 points

    Anthony,

    See the bq500212A web folder under the "Technical documents" tab.  There you will find an application note "bq500212A Wireless Power Transmitter I2C Interface".  This document shows what is available. The bq501210 version of this application note will be available later in Q3.  The command structure is the same as are the registers.  You can find the identification in the RX_STATS command (0x71 as you noted in the original post).

    In the bq51221 datasheet, table 18 shows the RXID.

    Regards,

    Dick