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What if the Wireless Receiver is dead?

Seth Berggren41
Prodigy 85 points
Other Parts Discussed in Thread: BQ500412, BQ51013A

If a Wireless Receiver device that uses the BQ51013A is completely out of power and it gets placed onto a Wireless Transmitter, such as the BQ500412, will the receiver be able to communicate to the transmitter in order to request a power transfer?

I am reading the BQ500412 datasheet and it says:

Communication within the WPC is from the receiver to the transmitter, where the receiver tells the transmitter to
send power and how much. In order to regulate, the receiver must communicate with the transmitter whether to
increase or decrease frequency.

What happens if the receiver is completely drained?

Thanks,

Seth Berggren

  • 0
    TI__Intellectual 1122 points

    Hello Seth,

    The Wireless Receiver device is able to communicate with the Transmitter even though the battery is drained. When placing the RX on the TX, the TX induces a voltage in the RX coil which supplies the RX and allows the device to communicate.

    The BQ500412 and BQ51013A will work together but since BQ51013A is WPC v. 1.0, the FOD function can not be used.


    Best Regards,

    Markus Fleck

  • 0 in reply to Markus_Fleck
    Prodigy 85 points
    Markus,

    Thanks for the response, very helpful.

    You said:
    The BQ500412 and BQ51013A will work together but since BQ51013A is WPC v. 1.0, the FOD function can not be used.

    Does this mean that, if I include the FOD function for the BQ500412, Power Transfer will still work with a v1.0 Receiver but the FOD feature will not work. Or, does it mean that including the FOD feature will cause the Power Transfer to not work? I assume it is the first one but I just wanted to clarify.

    Thanks,
    Seth Berggren
  • 0 in reply to Seth Berggren41
    TI__Intellectual 1122 points

    Seth,


    You´re assumption is right.

    The power transfer will work for a WPC v. 1.1 TX and WPC v.1.0 RX but the FOD feature won´t work.

    The key change from WPC v.1.0 to WPC v. 1.1 was adding the FOD feature which means Foreign Object Detection.
    This feature was added to recognize foreign metal objects (e.g. coins) between the TX and RX. If you want to know more about this feature, we just released a GUI which helps to find the right FOD resistor values. In this GUI is a User Guide included which also explains the details of FOD and what is needed for the process.

    The GUI is available under the following link:


    Best Regards,

    Markus