The MCP2221A is a USB-to-UART/I2C serial converter which enables USB connectivity in applications that have a UART and I2C interfaces.  The device reduces external components by integrating the USB termination resistors and the oscillator needed for USB operation. The MCP2221A also has four GP pins providing miscellaneous functionalities (GPIO, USBCFG, SSPND, Clock Output, ADC, DAC, interrupt detector).

The MCP2221A is identical to the MCP2221 in all aspects except for the maximum supported baud rate of the UART, which has been increased from 115200 (MCP2221) to 460800 (MCP2221A).  All MCP2221 USB Drivers and Software can be used for the MCP2221A.

Universal Serial Bus (USB)

• Supports full-speed USB (12 Mb/s)
• Implements USB protocol composite device:
  • Communication Device Class (CDC) for communications and configuration
  • Human Interface Device (HID) for I2C™, chip control and configuration
• 128-byte Buffer to handle data throughput at any UART baud rate:
  • 64-byte Transmit
  • 64-byte Receive
• Human Interface Device (HID) for both I2C™ communication and control.
  • 64 byte buffer to handle data throughput at any I2C™ baud rate
• Fully configurable VID and PID assignments, and string descriptors
• Bus-powered or self-powered
• USB 2.0 Compliant

USB Driver and Software Support

CDC and Universal Asynchronous Receiver/Transmitter (UART) Options

I2C™/SMBus

SMBus Master

General Purpose Input/Output (GPIO) Pins

Highly Configurable 

Operating voltage: 3.0 – 5.5V

Electrostatic Discharge (ESD) protection:

• 4 kV Human Body Model (HBM)

Industrial (I) Operating Temperature: -40°C to +85°C