MCP2221A-I/ST

Controllers Overview

The MCP2221A-I/ST is a USB-to-UART/I2C bridge controller in a TSSOP-14 package. It supports Full-Speed USB 2.0 at 12 Mb/s with integrated transceiver and oscillator. The device operates on a supply voltage of 3.0V to 5.5V, drawing 13 mA during operation. It functions within an industrial temperature range of -40°C to +85°C. Key interfaces include UART (up to 460800 baud), I2C/SMBus master (up to 400 kHz), and four configurable GPIO pins.

Controllers Feature Summary

• Integrates USB 2.0 full-speed transceiver and internal oscillator to minimize external components.
• Enumerates as a composite USB device supporting standard drivers for Virtual Com Port (CDC) and HID-based configuration.
• Provides flexible pin multiplexing for General Purpose Input/Output, ADC inputs, DAC output, and clock reference signals.

Controllers Applications

• USB-to-UART serial communication bridges
• I2C/SMBus master controllers for peripheral management
• GPIO expansion and control interfaces

Controllers Procurement Notes

Verify the specific suffix 'I/ST' corresponds to the Industrial temperature grade (-40°C to +85°C) and TSSOP-14 surface-mount package. Confirm that the ordering part number matches the required voltage and interface specifications for the target application design.

Controllers Selection Notes

Select this component when a single-chip solution is needed to convert USB connectivity to UART or I2C protocols without external PHY components. Ensure the host system supports Windows, Linux, or Mac OS enumeration requirements. Verify power supply constraints align with the 3.0V to 5.5V operating range.

Controllers Part Context

This device belongs to the MCP2221A series, which serves as a protocol converter between USB and legacy serial interfaces. It is functionally similar to the MCP2221 but offers an increased maximum UART baud rate of 460800 compared to the predecessor's 115200 limit.

Controllers Replacement Considerations

MCP2221: Identical functionality except for a lower maximum UART baud rate of 115200.

Controllers FAQ

How does the MCP2221A enumerate on the host system?

It enumerates as a composite USB device, utilizing the Communication Device Class (CDC) for UART data transfer and the Human Interface Device (HID) class for I2C transactions, GPIO control, and device configuration.

What are the default configurations for the GP pins?

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

Can the VID and PID be customized?

Yes, the Vendor ID (VID) and Product ID (PID) assignments, along with string descriptors, are fully configurable and stored in the device's Flash memory via the configuration utility.