Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Function | USB to I2C/UART protocol converter with GPIO |
| UART baud rate | 300 to 460800 baud |
| I2C host clock | Up to 400 kHz |
| Operating voltage | 3.0 V to 5.5 V |
| Temperature range | -40°C to +85°C |
| Package | 16-lead 4 × 4 mm QFN |
| Packing | Tape and reel |
| Exact device code | MCP2221AT |
Product Overview
The MCP2221AT-I/ML is the tape-and-reel QFN ordering version of Microchip’s MCP2221A USB-to-I2C/UART bridge. Electrically it belongs to the MCP2221A family, but the T in MCP2221AT is the catalog identifier for tape-and-reel supply.
The ML package is the 16-lead 4 × 4 mm QFN and the I grade covers -40°C to +85°C. The converter supports UART to 460800 baud, I2C/SMBus host operation to 400 kHz and configurable GP pins for host-controlled GPIO or alternate functions.
Technical Specifications
| Parameter | Confirmed Information |
|---|---|
| USB function | USB serial/protocol bridge |
| UART baud range | 300 to 460800 |
| I2C role | Host |
| I2C clock | Up to 400 kHz |
| SMBus host | Supported |
| GPIO | Four multifunction GP pins |
| Operating voltage | 3.0 V to 5.5 V |
| Temperature range | -40°C to +85°C |
| Package | 16-lead 4 × 4 mm QFN |
| Packing | Tape and reel |
| Product status | In Production |
Design Considerations
The T suffix does not indicate a different protocol engine or higher electrical rating; it identifies the tape-and-reel catalog order form. This distinction matters in procurement and automated assembly but should not be turned into a false functional difference.
Use the QFN land pattern and exposed-pad guidance for the ML package. A design based on the 14-lead TSSOP version needs a PCB change even though the USB/I2C/UART feature set is shared.
Related Engineering Resources
- MCP2221A USB 2.0 to I2C/UART Protocol Converter Data Sheet
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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