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bq50002 DMOD1/DMOD2

D House
Intellectual 275 points
Other Parts Discussed in Thread: BQ500511, BQ50002

What's the difference between DMOD1/DMOD2. What are the design criteria for the input conditioning for these inputs?

  • 0
    TI__Mastermind 20200 points
    The two chanel demodulation input DMOD1 and DMOD2 are the inputs to Peak and Phase Demodulator. Please refer to schematic in user guide for reference.
  • 0 in reply to Jing Zou
    Intellectual 275 points
    I don't fully understand what is meant by Peak and Phase Demodulation. Is this something specified by WPC?

    Are both demodulator outputs required to re-construct the signal? Is the 2nd DMOD a backup?

    Please note I am considering a proprietary wireless Tx not compliant with WPC (Qi).
  • 0 in reply to D House
    TI__Mastermind 20200 points

    bq50002 is just the analog front end IC. It should be pair with bq500511 for a complete wireless transmitter solution.

    This is how the communication between RX and TX works. As soon as the secondary side (RX) receives any power (that is, from a digital “ping”), it wakes up and applies load pulses as shown.  Extra load on the secondary will increase the primary side current.  This effectively shows up as a sort of “amplitude modulation” of the primary coil voltage and current.

    In bq50002/bq500511 system, bq50002 performs the demoduation function and outputs a digitized version of the message on each channel (DMOUT1 and DMOUT2). The bq500511 then decodes the message one at a time. bq500511 decodes and processes the message and controls the bq50002 through the CLK_OUT, UP_DOWN, and MODE pins to adjust the operating point and thus its output power.

    If there is any issue on the DMOUT1 message, bq500511 then decodes the DMOUT2 message in the next communication packet.

    This is not specified by WPC. This is just the architecture of this two-chip TX solution.