The CP2120 compact SPI-to-I2C bridge and general purpose port expander device can be easily added to a system to solve interface compatibility problems and add more GPIO when required. CP2120 includes a four-wire slave SPI bus, bridge control logic, a bidirectional I2C bus interface, and eight general-purpose input/output (I/O) pins. A SPI master communicates with other I2C devices by instructing the CP2120 to send and receive I2C data traffic using the simple command set. CP2120 can act as a master-transmitter and a master-receiver on the I2C bus and handle all I2C timing, addressing, and arbitration.
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