The protection can also be configured to disable the device output and/or force the receiver to send an EPT
packet when triggered.
Figure 32. NTC Rx protection threshold setting
Figure 33. NTC Rx protection settings NTC ADC
5.9.7 Foreign object detection (FOD)
Foreign object is any object placed either on or near the transmitting coil, which is not considered a valid wireless
power receiver and is magnetically active. Presence of the magnetic field generated by the transmitting coil may
cause eddy currents to form in the foreign object (such as coins, keys etc.), which in turn would heat the object to
potentially dangerous temperatures. To avoid possible damage to the device or even injury of the user, the power
transmitter must be able to detect presence of a foreign object. This detection can be implemented in several
different ways.
UM3154
Protections overview
UM3154 - Rev 2
page 26/81
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