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BQ50002A: Burst waveform

Rafael Queiroz
Prodigy 40 points
Part Number: BQ50002A
Other Parts Discussed in Thread: BQ500511A, , TIDA-00623

I assembled a wireless power TX using the BQ50002A/BQ500511A as recommended on the BQ50002A datasheet (even though it recommends a 4-layer PCB I designed it with 2 layers) and got an unexpected output from my TX coil:

 

I expected a flat burst corresponding to the 'ping', but instead I got this decaying behavior on it. When I zoomed out the scope looked like a pulse train like this:

I would like to know why this is happening. If anyone could help me with it I'd really appreciate it.

I can provide any further information relevant to my design if needed.

  • 0
    TI__Guru 67866 points
    Take a look at the test report for TIDA-00623, it has some wave forms that can be used as a reference.
    I suspect this is the ping used to detect an RX that is sent every 400ms to 500ms. The TX will detect a change in the ping pulse and transition to Digital Ping to power the RX for ID and Configuration. If this is successful TX will keep power on the RX. If not the Digital Ping will only be applied for 80ms.