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 |
| GPIO | 4 configurable GP pins |
| Operating voltage | 3.0 V to 5.5 V |
| Temperature range | -40°C to +85°C |
| Package | 16-lead 4 × 4 × 0.9 mm QFN |
| Packing | Standard / non-T order form |
Product Overview
The MCP2221A-I/ML is Microchip’s industrial-temperature QFN implementation of the MCP2221A USB-to-I2C/UART bridge. It lets a USB host communicate with UART and I2C/SMBus peripherals without requiring a separate microcontroller firmware layer for the basic bridge function.
The exact ML suffix identifies a 16-lead 4 × 4 mm QFN package. The device supports UART rates from 300 to 460800 baud, I2C host operation to 400 kHz and four multifunction GP pins. Because the part number is MCP2221A rather than MCP2221AT, this catalog form is the standard non-tape-and-reel ordering version.
Technical Specifications
| Parameter | Confirmed Information |
|---|---|
| USB role | USB device / bridge |
| UART | UTx and URx |
| UART baud range | 300 to 460800 |
| I2C role | Host |
| I2C clock | Up to 400 kHz |
| I2C addressing | 7-bit; 10-bit via host library support |
| Block transfer size | Up to 65,535 bytes |
| GPIO | GP0 to GP3 multifunction pins |
| Operating voltage | 3.0 V to 5.5 V |
| Temperature range | -40°C to +85°C |
| Package | 16-lead QFN, 4 × 4 × 0.9 mm |
| Product status | In Production |
Design Considerations
The QFN version saves board area but requires the correct thermal/ground pad and assembly process. Do not substitute the TSSOP package without checking pin mapping and footprint.
I2C performance is host-controlled through USB transactions, so application latency is not identical to a local MCU hardware I2C peripheral even though the bus itself can run at 400 kHz. Use the bridge architecture for host-connected control and configuration rather than hard real-time bus timing.
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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