Figure 32. Plot logged data
The logged data are processed before being plotted, as the tool also takes into consideration a few physical
properties of the circuit. Those properties are set in the top part of the parameter list on the right side of the
window and include:
• TxSwitchLossCoef selects if the switch loss should be included in the calculation.
• CoilResistance refers to the STWBC86TX coil resistance.
• Cser and CserResistance refer to the STWBC86TX series resonant capacitor capacitance and resistance
values.
Values listed below are the tuneable parameters of the FOD algorithm.
VcpPeakDrop is a ring node voltage value modifier. CoilCoef is a scaling factor, which incorporates frequency
dependent losses into the calculation. Adjust the VcpPeakDrop and CoilCoef values until the foreign object and
non-foreign object curves are as separate as possible. VcpPeakDrop can be set in steps of 50 mV, CoilCoef can
be set in steps of 1
.
PlossThreshold sets a threshold for foreign object detection. If the calculated power loss is higher than the set
threshold, FOD protection is triggered. PlossThreshold can be set in steps of 32 mW.
UM3161
Foreign object detection (FOD)
UM3161 - Rev 1
page 26/78
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