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The Isolated I2C port is implemented using the ADuM1250 I2C Isolator and ADuM5000 isoPower Isolated DC to DC converter. The ADuM1250 connects to TW1 of the ADSP-BF548 and is capable of functioning at a maximum frequency of 1MHz. Figure 1 below shows a circuit diagram of the implementation of the ADuM1250 and ADuM5000 on the ezLINX hardware.
A three pin screw terminal connector, J22, is used for easy access to the SDA (Pin 1), SCL (Pin 2) and I2C_ISO_GND (Pin 3) connections.