usb-com资料.rar_USBCOM_usbtocom资源-CSDN文库

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USB到COM接口是一种技术，它允许通过USB（通用串行总线）连接设备与计算机进行通信，模拟传统的串行端口（COM）。这种技术在许多领域都有应用，比如嵌入式系统、工业控制、物联网设备等，因为USB接口比老式的串口提供了更高的数据传输速度和更方便的即插即用功能。 USB2comforXP.exe 和 usb2comfor98_2K.exe 是两个安装程序，分别用于Windows XP和Windows 98/2000操作系统。它们可能包含了驱动程序和软件，使得计算机能够识别并配置USB转COM口的设备。安装这些程序后，用户可以通过USB端口将设备连接到电脑，然后在操作系统中找到一个新的虚拟COM端口，从而实现数据传输。 03112701_1_P1.gif 可能是一个图像文件，它可能是介绍USB到COM转换过程的示意图或者产品图片，帮助用户理解如何设置或使用相关的硬件设备。 FT232AM.pdf 是一份技术文档，通常由芯片制造商提供，FT232AM是一款常见的USB到UART（通用异步收发传输器）桥接芯片。这个PDF可能包含了芯片的技术规格、引脚定义、电路设计指导、驱动程序信息以及API接口说明等内容，对开发者来说非常重要，他们需要这些信息来正确地设计和编程基于FT232AM的USB到COM转换器。 www.pudn.com.txt 很可能是一个链接或者引用，指向一个网站pudn.com，这是一个知名的工程技术交流平台，用户可以在上面找到各种技术资源和讨论。这个文件可能是提醒用户在遇到问题时可以去该网站搜索更多相关信息或者寻求帮助。总结起来，这个"usb-com资料.rar"包含了一系列与USB到COM接口相关的资源，包括驱动程序、用户手册和可能的设计参考。这些资料对于需要开发、配置或维修USB转COM设备的工程师和技术人员非常有用。通过USB转COM，用户能够利用USB接口的便利性，同时保持与旧有串行设备的兼容性，从而实现更高效的数据传输和设备管理。

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usb-com资料.rar （5个子文件）

usb2comfor98_2K.exe 363KB

usb2comforXP.exe 374KB

www.pudn.com.txt 218B

03112701_1_P1.gif 37KB

FT232AM.pdf 40KB

FT8U232AM

Future Technology Devices Intl. FT8U232AM Preliminary Information Rev 0.8 – Subject to Change

U-UART - USB UltraBaud Data Transfer IC with RS232 / RS422 and CPU I/F Options

FEATURES

•

Single Chip Multi-Function Data Transfer

Solution

•

RS232 link from 300 baud to 920K baud

•

RS422/RS485 Link to 2000K baud

•

384 byte receive buffer / 128 byte transmit

buffer for high data throughput

•

Full hardware assisted or X-On/X-Off

handshaking

•

Support for Event Characters and Line Break

condition

•

Auto Transmit Buffer control for RS485

•

Compact 32 pin ( 7mm x 7mm ) MQFP package

•

Integrated 6MHz - 48MHz Clock Multiplier aids

FCC and CE compliance

•

Integrated 3.3v Regulator – No External

Regulator Required

•

4.4v .. 5.25v Single Supply Operation

•

UHCI / OHCI Compliant

•

USB 1.1 Specification Compliant

•

USB VID, PID, Serial Number and Product

Description Strings in external E2PROM.

Note ** = Currently in development

Virtual COM Port Drivers for –

Windows 98 and Windows 98 SE

Windows 2000

Windows Millennium **

Apple iMAC **

Linux **

•

Application Areas

USB ISDN and ADSL Modems

USB 56k / V90 Modems

USB

PDA Interface Cables

USB

RS232 Converters / Cables

USB

RS422 / RS485 High Speed Industrial

Links

USB Digital Cameras

USB I/F for MP3 players

Ultra-high performance Serial Port for legacy -

free PC system boards / Easy PC’s

USB Instrumentation

USB

USB data transfer cables

USB

USB null-modem cables

USB

Serial Bar Code Readers

GENERAL DESCRIPTION

The FT8U232AM is a cost-effective single chip USB UART ( U-UART ) solution for transferring serial data

over USB. With data transfer rates of up to 920k baud ( RS232 ) and 2,000 k baud ( RS422 / RS485 ) , the

FT8U232AM significantly raises the performance level above that above that of traditional ISA and PCI based

UART solutions whilst offering true plug and play and easy interfacing through it’s USB interface.

Its flexible architecture allows this IC to be used in many different application areas - USB modems,

Legacy RS232

USB Converter cables, USB interface cables for PDA’s , Bar Code Scanners , RS422 data links

and instrumentation – in fact almost any equipment that previously used a slow RS232 link for communication.

Virtual COM port drivers are available for the FT8U232AM for Windows ’98, Windows 98 SE and Windows

2000. Drivers for other operating systems are currently under development.

Future Technology Devices Intl. FT8U232AM Preliminary Information Rev 0.8 – Subject to Change

Figure 1 – FT8U232AM Block Diagram ( Simplified )

Figure 2 – FT8U232AM I.C. Pinout

x8 Clock

Multiplier

UART

FIFO Controller

Serial Interface

Engine

( SIE )

USB

Protocol Engine

Baud Rate

Generator

UART

Dual Port RX

Buffer

384 Bytes

Dual Port TX

Buffer

128 bytes

3.3 Volt

LDO

Regulator

USB

Transceiver

USB DPLL

6MHZ

Oscillator

48MHz

12MHzXTIN

XTOUT

USBDP

USBDM

3V3OUT

VCC

TXD

RXD

RTS#

CTS#

DTR#

DSR#

DCD#

RI#

EEPROM

Interface

TXDEN

USBEN

PWRCTL

TXLED#

RXLED#

EECS

EESK

EEDATA

RCCLK

SLEEP#

RESET#

TEST

GND

EESK

EEDATA

VCC

RESET#

TEST

3V3OUT

USBDP

USBDM

GND

SLEEP#

RXLED#

TXLED#

PWRCTL

USBEN

TXDEN

VCC

GND

RI#

DCD#

DSR#

DTR#

CTS#

RTS#

RXD

TXD

VCC

XTOUT

XTIN

AGND

AVCC

RCCLK

EECS

FTDI

FT232AM

XXYY

Future Technology Devices Intl. FT8U232AM Preliminary Information Rev 0.8 – Subject to Change

FT8U232AM - FUNCTIONAL BLOCK DESCRIPTION

•

3.3V LDO Regulator

The 3.3V LDO Regulator generates the 3.3 volt reference voltage for driving the USB transceiver cell

output buffers. It requires an external decoupling capacitor to be attached to the 3V3OUT regulator

output pin.

•

USB Transceiver

The USB Transceiver Cell provides the USB 1.1 full-speed physical interface to the USB cable. The

output drivers provide 3.3 volt level slew rate control signalling, whilst a differential receiver and two single

ended receivers provide USB data in, SEO and USB Reset condition detection.

•

USB DPLL

The USB DPLL cell locks on to the incoming NRZI USB data and provides separate recovered clock and

data signals to the SIE block.

•

6MHz Oscillator

The 6MHz Oscillator cell generates a 6MHz reference clock input to the X8 Clock multiplier from an

external 6MHz crystal or ceramic resonator.

•

X8 Clock Multiplier

The X8 Clock Multiplier takes the 6MHz input from the Oscillator cell and generates a 12MHz reference

clock for the SIE, USB Protocol Engine and UART FIFO controller blocks. It also generates a 48MHz

reference clock for the USB DPPL and the Baud Rate Generator blocks.

•

Serial Interface Engine ( SIE )

The Serial Interface Engine ( SIE ) block performs the Parallel to Serial and Serial to Parallel conversion

of the USB data. In accordance to the USB 1.1 specification, it performs bit stuffing / un-stuffing and

CRC5 / CRC16 generation / checking on the USB data stream.

•

USB Protocol Engine

The USB Protocol Engine manages the data stream from the device USB control endpoint. It handles the

low level USB protocol ( Chapter 9 ) requests generated by the USB host controller and the commands

for controlling the functional parameters of the UART.

•

Dual Port TX Buffer ( 128 bytes )

Data from the USB data out endpoint is stored in the Dual Port TX buffer and removed from the buffer to

the UART transmit register under control of the UART FIFO controller.

Future Technology Devices Intl. FT8U232AM Preliminary Information Rev 0.8 – Subject to Change

• Dual Port RX Buffer ( 384 bytes )

Data from the UART receive register is stored in the Dual Port RX buffer prior to being removed by the

SIE on a USB request for data from the device data in endpoint.

• UART FIFO Controller

The UART FIFO controller handles the transfer of data between the Dual Port RX and TX buffers and the

UART transmit and receive registers.

• UART

The UART performs asynchronous 7 / 8 bit Parallel to Serial and Serial to Parallel conversion of the data

on the RS232 ( RS422 and RS485 ) interface. Control signals supported by the UART include RTS, CTS,

DSR , DTR, DCD and RI. The UART provides a transmitter enable control signal ( TXDEN ) to assist

with interfacing to RS485 transceivers.

• Baud Rate Generator

The Baud Rate Generator provides a x16 clock input to the UART from the 48MHz reference clock and

consists of a 14 bit prescaler and 2 register bits which provide fine tuning of the baud rate ( e.g. to divide

by 2.5 ). This determines the Baud Rate of the UART which is programmable from 300 baud to 2 million

baud. For more details please contact FTDI.

• EEPROM Interface

Though the FT8U232AM will work without the optional EEPROM, an external 93C46 EEPROM can be

used to customise the USB VID, PID, Serial Number and Strings of the FT8U232AM for OEM

applications. The EEPROM is also required for applications where multiple FT8U232AM’s are connected

to a single PC as the drivers rely on a unique serial number for each device to bind a unique virtual COM

port to each individual device.

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