USB I2C click carries an MCP2221 USB-to-UART/I2C converter. The chip supports full-speed USB (12 Mb/s), I2C with up to 400 kHz clock rates and UART baud rates between 300 and 115200. The board communicates with the target MCU through mikroBUS UART (RX, TX) or I2C (SCL, SDA) interfaces. In addition to mikroBUS, the edges of the board are lined with additional GPIO and I2C pins. It can operate on 3.3V or 5V logic levels.