KTS1622 Low Voltage 16-Bit I2C-bus I/O Expanders Kinetic Technologies KTS1622 Low Voltage 16-Bit I2C-bus I/O Expanders are designed for microcontrollers when additional I/Os are required with minimum interconnections. The KTS1622 features separate power rails (VDD_I2C and VDD_P) for I2C bus and I/O ports, both range from 1.65V to 5.5V. These rails allow a mixed power system where I2C bus power is incompatible with I/O port power.