MCP2200 datasheet(4/34 Pages) MICROCHIP

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MCP2200

DS22228A-page 4

 2010 Microchip Technology Inc.

1.1

Supported Operating Systems

Microsoft

Windows

XP(SP2

and

later)/Vista/7

operating systems are supported.

1.1.1

ENUMERATION

The MCP2200 will enumerate as a USB device after

POR. The device enumerates as both a Human

Interface Device (HID) for I/O control, and a VCP.

1.1.1.1

HID

The MCP2200 enumerates as a HID so the device can

be configured and the I/O can be controlled. A DLL is

supplied by Microchip that allows I/O control using a

custom interface.

1.1.1.2

VCP

The VCP enumeration implements the USB-to-UART

data translation.

1.2

Control Module

The control module is the heart of the MCP2200. All

other modules are tied together and controlled via the

control module. The control module manages the data

transfers between the USB and the UART, as well as

command requests generated by the USB host

controller, and commands for controlling the function of

the UART and I/O.

1.2.1

SERIAL INTERFACE

The control module interfaces to the UART and USB

modules.

1.2.2

INTERFACING TO THE DEVICE

The MCP2200 can be accessed for reading and writing

via USB host commands. The device cannot be

accessed and controlled via the UART interface.

1.3

UART Interface

The MCP2200 UART interface consists of the TX and

RX data signals and the RTS/CTS flow control pins.

The UART is configurable for several baud rates. The

available data formats and baud rates are listed in

Table 1-3.

1.3.1

INITIAL CONFIGURATION

The default UART configuration is 19200, 8, N, 1. The

default start up baud rate can be changed using the

Microchip supplied configuration PC tool. The primary

baud rates are shown in Table 1-3.

Alternatively, a custom configuration tool can be

created using the Microchip supplied DLL to set the

baud rate, as well as other parameters. See

Section 2.0 “Configuration”

for details.

1.3.2

GET/SET LINE CODING

The GET_LINE_CODING and SET_LINE_CODING

commands are used to read and set the UART

parameters

while

operation.

For

example,

Hyperterminal sends the SET_LINE_COMMAND when

connecting to the port. The MCP2200 responds by

setting the baud rate only. The other parameters (Data

Bits, Parity, Stop Bits) remain unchanged.

1.3.2.1

Rounding Errors

The primary baud rate setting (with the rounding errors)

are shown in Table 1-3. If baud rates other than the

ones shown in the table are used, the error percentage

can be calculated using Equation 1-1 to find the actual

baud rate.

1.3.3

CUSTOM BAUD RATES

Custom baud rates are configured by sending the

SET_LINE_CODING

USB

command, or by using the

DLL. See Section 2.0 “Configuration” for more

information.

TABLE 1-2:

UART CONFIGURATIONS

Parameter

Configuration

Primary Baud Rates

See Table 1-3

Data Bits

Parity

Stop Bits

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