Please clarify if the part SL354011FHK is able to power from the antenna (to which it is connected during UHF operation) or require a separate power supply for operation.
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UCODE products harvest power from the reader EM field. As mentioned in the product's General description, this passive smart tag requires no external power supply for contactless operation. In the case of the need of using the I2C interface, It will require to be powered on through the VDD and GND pins shown in section 7.