Define the two sides of the bridge
The MCP2200 is Microchip’s USB-to-UART converter. The USB interface and logic-level UART serve different electrical roles. It is not, by itself, an RS-232 voltage-level transceiver or an isolation barrier.
Identify the host connection, target processor, required UART settings and any flow-control signals. Confirm the exact package and current data-sheet revision before creating the symbol and footprint.
Review power, clock and logic compatibility
Check the documented supply arrangement, clock requirements, reset and local capacitors for the chosen device configuration. Verify UART input and output levels against the target circuit. Do not assume that the USB supply voltage establishes compatibility with every MCU pin.
Consider how the board behaves when the USB host or target is powered off independently. Review possible back-powering paths and connector exposure. Select any required protection or level translation from the actual interface conditions.
Inspect the USB and connector layout
Route the USB pair with the appropriate geometry and reference continuity for the design. Keep connector mapping, protection placement and return paths consistent with the device guidance. A USB-C connector additionally requires the correct connector-role implementation; changing the connector shape alone is insufficient.
Check pin one, footprint dimensions and connector mechanical loads. Provide strain relief or enclosure support where cable forces could stress solder joints. Include accessible points for power and communication diagnosis.
Validate hardware and software together
Use official software and documentation for the supported host environment. Test enumeration, UART communication and any flow control with the intended target. Record configuration settings and firmware dependencies with the board revision.
Supply the exact BOM, placement file and test procedure for assembly. A loopback check can be useful, but end-to-end communication with the actual target verifies more of the product interface.