SPI VS IIC SPI vs. I2C Both SPI and I2C provide good support for communication with slow peripheral devices that are accessed intermittently. EEPROMs and real-time clocks are examples of such devices. But SPI is better suited than I2C for applications that are naturally thought of as data streams (as opposed to reading and writing addressed locations in a slave device). An example of a "stream" application is data communication between microprocessors or digital signal processors. Another is data transfer from analog-to-digital converters. SPI can also achieve significantly higher data rates than I2C. SPI- compatible interfaces often range into the tens of megahertz. SPI really gains efficiency in applications that take advantage of its duplex capability, such as the communication between a "codec" ……