MCP2221-I/SL

Controllers Overview

The MCP2221-I/SL is a USB-to-UART/I2C bridge device manufactured by Microchip Technology, housed in a 14-pin SOIC package. It supports Full-Speed USB (12 Mb/s) and implements a composite device using Communication Device Class (CDC) for UART conversion and Human Interface Device (HID) for I2C control. The operating voltage ranges from 3.0 V to 5.5 V with an industrial temperature range of -40°C to +85°C. It features four general-purpose I/O pins, three ADC inputs, one DAC output, and a configurable clock reference output.

Controllers Feature Summary

• Implements USB Protocol Composite Device supporting CDC for UART and HID for I2C/GPIO
• Integrates internal oscillator and USB termination resistors to reduce external components
• Includes fully-configurable VID/PID assignments and persistent Flash memory settings
• Provides four multi-functional GP pins assignable to GPIO, ADC, DAC, or interrupt detection

Controllers Applications

• USB-to-UART serial converter applications requiring standard driver support
• I2C master controller interfaces for connecting host systems to peripheral devices
• Embedded systems requiring integrated GPIO expansion and analog signal acquisition

Controllers Procurement Notes

Verify the specific suffix 'SL' corresponds to the SOIC-14 package and Industrial temperature grade (-40°C to +85°C). Confirm that the ordering information matches the datasheet revision DS20005292C. Ensure compatibility with Windows XP through 8.1 and Linux distributions supporting CDC/HID classes before finalizing procurement.

Controllers Selection Notes

Select this component when a single-chip solution is required for both UART and I2C connectivity via USB. Consider the 14-pin SOIC package constraints and the need for a local ceramic bypass capacitor on the VUSB pin. Verify that the application requires Full-Speed USB operation and does not demand High-Speed capabilities.

Controllers Part Context

This part belongs to the MCP2221 series of USB interface ICs designed to simplify connectivity for embedded designs. It serves as a protocol converter between USB hosts and legacy serial or I2C peripherals. The series includes variants with different packages such as PDIP and QFN, offering flexibility for various board layout requirements.

Controllers Replacement Considerations

MCP2221A-I/ST

Controllers FAQ

How does the MCP2221 handle enumeration?

It enumerates as a composite USB device, utilizing the Communication Device Class (CDC) for UART functions and the Human Interface Device (HID) class for I2C communication and configuration.

What are the default configurations for the General Purpose pins?

By default, GP0 acts as an LED indicator for UART RX activity, GP1 indicates UART TX activity, GP2 signals USB configuration status, and GP3 indicates USB-I2C traffic.

Can the VID and PID be customized?

Yes, the Vendor ID (VID) and Product ID (PID) are fully configurable and stored in the device's Flash memory, allowing for custom identification during USB enumeration.