MCP2200 Converter: Features, Pinout, and Datasheet

The MCP2200 is a USB-to-UART serial converter that enables USB communication in UART-equipped applications. The USB termination resistors are integrated within the device, which decreases the number of external components. The MCP2200 additionally includes a 256-byte user EEPROM.

Eight general-purpose input/output pins are available on the MCP2200. Four pins serve as alternate indicators of USB and communication status.

Pinout

Symbol

Footprint

3D Model

(1) Universal Serial Bus (USB)

• Supports full-speed USB (12 Mb/s)

• Implements USB protocol composite device CDC device for communications, configuration and I/O control

• 128-byte buffer to handle data throughput at any UART baud rate:

- 64 byte transmit

- 64-byte receive

• Fully configurable VID and PID assignments, and string descriptors

• Bus-powered or self-powered

• USB 2.0 Compliant (certification #: TBD)

(2) USB Driver and Software Support

• Uses standard Microsoft® Windows® drivers for Virtual Com Port (VCP):

- Windows XP(SP2 and later)/Vista/7

• Configuration utility for initial configuration

(3) Universal Asynchronous Receiver/Transmitter (UART)

• Responds to SET LINE CODING commands to dynamically change baud rates

• Supports baud rates: 300-1000k

• Hardware flow control

• UART signal polarity option

(4) General Purpose Input/Output (GPIO) Pins

• Eight (8) general-purpose I/O pins

(5) EEPROM

• 256 bytes of user EEPROM

(6) Other

• USB activity LED outputs (TxLED and RxLED)

• SSPND output pin

• USBCFG output pin (indicates if requested current is allowed)

• Operating voltage: 3.0-5.5V

• Oscillator input: 12 MHz

• ESD protection > 4 kV HBM

• Industrial (I) Operating Temperature: -40°C to +85°C

Functional Block Diagram

There is a PCB that has an LM1117 (3.3V), Micro USB connector, MCP2200 USB-to-UART bridge, 12 MHz SMD crystal, and a few passive components.

We've been watching the PCB for a few weeks and have noticed that it doesn't always work. When I connect to a machine, it occasionally displays an error message such as "USB Device not recognized" (in Windows) or "Device read/write descriptor failed" (in Linux), and then it stops working for hours before restarting. I looked through my circuit and couldn't come up with a solution to this problem. We ruled out a soldering/component issue after resoldering the board and replacing old components many times. I believe the crystal is unable to start, or that there is a race condition between the voltage at Vcc and the voltage at the RST pin, but I'm not sure how to identify the real issue and address it with MCP.

The MCP2200 schematic is provided below:

The layout of the PCB: MCP2200's Pad is in green and left side of the picture with USB connector at top left corner.

The input clock must be 12 MHz to provide the proper frequency for the USB module. USB full-speed is nominally 12 Mb/s. The clock input accuracy is ±0.25% (2,500 ppm maximum).

Quartz Crystal Operation

Ceramic Resonator Operation

The input clock must be 12 MHz to provide the proper frequency for the USB module. USB full-speed is nominally 12 Mb/s. The clock input accuracy is ±0.25% (2,500 ppm maximum).

Quartz Crystal Operation

Ceramic Resonator Operation

• Desktop/Notebook PCs

• Multi-function Printers

• Digital TVs

• Monitors

• Consumer Audio/Video Devices

• Stand-alone Flash Media Reader/Writers

• Digital Picture Frames

• Media Players

• Set-top Boxes

• Gaming Consoles

• Automobile/Home Audio Systems

• Industrial Applications

Package

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