Application Note
17 of 36
002-34970 Rev. **
2022-05-03
Foreign object detection tuning guide for wireless power transmitters
Applicable for WLC ICs
FOD parameter tuning
Figure 11
UART connections with PC
4.
Open the serial communication terminal (such as Minicom/Tera Term/Putty) and set the baud rate
to 1000000.
5.
Leave the rest of the UART settings as default.
6.
Power on the transmitter board to see UART logs (human-readable ASCII characters) on the serial
communication tool (UART interface).
Default Tera Term screen
UART log on Tera Term
Figure 12
Tera Term debug screen and log UI for reference
3.4
Q factor scaling factor tuning process
Use the
“
QF Scaling Factor Calc
” page in
FOD_TuningGuide_Calculator.xlsx
as the supporting document for this
section. Update the “User Inputs” section with the measured
and reported Q-Factor values. The measured and
reported Q-Factor values can be taken from the UART logs of WLC power transmitter.
The “Calculations”
section in the
“
QF Scaling Factor Calc
” page
, generates the scaled Q
–
factor values. Q Factor method is based on
TPRs with least friendly metals, for instance, standard Qi compliance TPRs like TPR#MP3, TPR#7 and TPR with
high friendly metals like TPR#MP4.