BQ51013B: Detection of the frequency from coil

Hello

I have see into the BQ51013B (and BQ51050B) that a pin call "RECT" exist and is use to have an voltage input from the coil.

But I search a component which do the power charging AND the detection of the frequency.

I search a component where the coil signal can be measured.

I see into the "RECT" signal that in beggining of the Wireless power transmitted, the RECT signal have oscillation. But I don't see if this oscillation is the frequency of the power signal for the coil or if it's a simple osccillator.

--> With this component, is it possible to measure the coil signal frequency ??

(I want measure the 125 kHz, which send by the Wireless power transmitter)

Thank you for your helps.

Best regards,

Damien