STWBC86 and STWLC38 FOD

[JAKE2]

Hello, I am on the RX FOD Tunning (BPP) phase, and I have a question.

 

In the document, it is written - Reading Ptx and Prx is done automatically when using STEVAL- WBC86TX .

But I am using just custom board, so I recorded the power from the  "Charts" Tab and save it to .csv file.

While looking .csv file, there's TX TX PWR(mW), TX RX PWR(mW)  at the very right side.

Do they mean TX or RX power seen from TX's side?

And sometimes the RX power is slightly bigger than TX power.

Could you tell me why is that ?

And can I replace it with the .csv file data instead of automatically recorded value?

Thank You.

-Jake-

[willzhou]

Hi Jake
Can you share some log and test data, so i can get more information.

[willzhou]

Hi Jake

Have you follow this pdf Page 62 ?

https://www.st.com/resource/en/user_manual/um3154-getting-started-with-the-stevalwlc38rx-wireless-power-receiver-evaluation-board-for-5-w-qi-bpp-and-15-w-qi-epp-applications-stmicroelectronics.pdf

 

[JAKE2]

Dear willzhou, sorry for the late reply.

 

Yes, the recording was done by following the datasheet.

 

When load attatched on the RX's side, TX Power is higher than RX Power.

↓But, when no load on the RX's side, TX Power is lower than RX Power.

 

So, the graph shape is little different than the user manual(datasheet).

The initial value of the graph is above 0.

I tried many times but (when x axis [ADC Isns] is 0mA) no graph was similar.

Could you tell me why?

Best Regards,
Jake.

 

 

 

 

[willzhou]

Hi Jake
I have received your request, let me discuss internal to solved fod tuning issues