EZ-USB™ Serial Bridge Controllers Infineon Technologies EZ-USB™ Serial Bridge Controllers offer configurable and fixed-function options. The controllers are configurable serial channels for UART/I2C/SPI interfaces. The devices have low power consumption in standby mode (5uA). With fixed-function controllers, it can be configured to work as USB to UART, USB to I2C, or USB to SPI bridges without requiring any firmware development by the user.