Texas Instruments TUSB3410UARTPDK Manuale utente

Application Report

SLLU043B – JANUARY 2006

TUSB3410UARTPDK User’s Guide

Connectivity Solutions

Contents

1Overview..........................................................................................................................................2

1.1 What’s Included.........................................................................................................................2

1.2 Hardware/Software Requirements for TUSB3410UARTPDK ...................................................2

1.3 TUSB3410UART EVM Board Overview....................................................................................3

2System Setup and Procedure ........................................................................................................3

2.1 A Note on PIDs for TUSB3410UART EVM...............................................................................6

3EVM Materials..................................................................................................................................9

3.1 BOM .......................................................................................................................................9

3.2 Layout .....................................................................................................................................10

3.3 Schematic................................................................................................................................10

Figures

Figure 1. TUSB3410UART Evaluation Module.................................................................................3

Figure 2. Typical System Setup........................................................................................................4

Figure 3. Enumeration on Windows 98............................................................................................5

Figure 4. Enumeration on Windows 2000/XP ..................................................................................6

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2TUSB3410UARTPDK User’s Guide

1Overview

The TUSB3410UARTPDK is a product design kit (PDK) intended to showcase the TUSB3410

as a compact USB to serial interface bridge. Together with TI’s Virtual COM Port (VCP)

software, it produces a turnkey, configurable USB/serial bridge solution.

TI provides all components necessary to complete the solution:

•the integrated circuit devices

•firmware to run on the device

•drivers (Windows, Mac OS, Linux)

•utilities and instructions necessary for the designer to implement the solution in the end

design.

The information in this kit is subject to change, and software updates are ongoing. For the latest

information pertaining to this kit, please visit http://www.ti.com/rd/tusb3410uart. For the latest

version of the software, please visit www.ti.com/rd/tusbwinvcp.

1.1 What’s Included

This kit contains the following:

•“Getting Started” document (SLLU048B)

•TUSB3410UART EVM

•USB cable (certified by the USB-IF)

•Serial cable

•An application note, “Application of TI’s VCP Software Solution” (SLLA170) which walks the

designer through the process of implementing the VCP solution.

The driver/firmware software package must be downloaded from TI’s website (www.ti.com). TI

distributes this software via the web so that you are sure to get the latest build. Please see the

“Getting Started” document for specific instructions in obtaining the software.

1.2 Hardware/Software Requirements for the TUSB3410UARTPDK

The TUSB3410UART EVM is designed for use with a personal computer running a USB–

enabled operating system. The PC should be compliant with the USB 1.1 or 2.0 specifications.

This implies that the BIOS, chipsets, and operating system are all USB specification compliant.

The TUSB3410UARTPDK is primarily intended for evaluation with the Windows version of the

VCP driver. All descriptions provided in this user’s guide assume that Windows is the software

environment. While the Linux and Mac OS versions could be used as well, they may require

additional configuration. Contact TI if you’re interested in these alternate versions of the driver.

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TUSB3410UARTPDK User’s Guide 3

1.3 TUSB3410UART EVM Board Overview

The TUSB3410UART evaluation module (EVM) provided in this kit is specifically designed to

showcase the TUSB3410 as a compact USB to serial interface bridge. TUSB3410 interfaces

full-speed (12Mbps) USB to a high-speed UART. The EVM adds an RS232 driver to interface to

standard serial port devices.

Included in the TUSB3410 EVM design are an I2C serial EEPROM, a 12MHz crystal, and a 5V-

to-.3V low-dropout voltage regulator. The EEPROM contains code to boot the TUSB3410’s

internal 8052 micro controller and other configuration parameters while the 12MHz crystal

provides the clock source for the device. The 5V-to-3.3V voltage regulator converts the 5V USB

bus power to 3.3V, which is required by the TUSB3410.

The EVM operates from 5V USB bus power. A TUSB3410 solution may be either self-powered

or bus powered.

The EVM is 3cm by 6cm. See Fig. 1.

Figure 1. TUSB3410UART Evaluation Module

2System Setup and Procedure

Download the software per the instructions in the “Getting Started” document accompanying this

kit. Install the driver according to the instructions.

Please run the installer included in the driver package rather than allowing Windows to conduct

the installation. While it is possible to do a proper install by first attaching the EVM and allowing

Windows to complete the installation, running the installer is more automated. The installer

seeks out and resolves any conflicts that could prevent the driver from working properly.

Be sure to run the appropriate version of the installer depending on your version of Windows

(Windows 98/ME or Windows 2000/XP). The installer places both the driver and a firmware file

that will be downloaded to the EVM when it is attached.

Fig. 2 shows the typical system setup.

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4TUSB3410UARTPDK User’s Guide

Figure 2. Typical System Setup

Attach a serial device to the TUSB3410UART EVM using the serial cable and attach the EVM to

the PC using the USB cable. The first time you attach the EVM to the host PC, Windows

displays “bubble” information in the lower right corner, showing text that originates in the

EEPROM device located on the board. This is information you can customize for your product.

Also located in the EEPROM is a device descriptor containing a Vendor ID (VID) and Product ID

(PID). For the TUSB3410UART EVM, these values are 0x0451 (the VID assigned to TI by the

USB Implementers Forum) and 0x341A (the PID TI has assigned to this EVM), respectively.

The operating system uses the VID/PID combination to identify the type of device that has been

attached, and therefore what driver it needs to load. The VCP driver is configured to respond to

the 0451/341A VID/PID pair.

Furthermore, the EEPROM includes a string descriptor containing a serial number for this EVM.

The operating system uses the combination of the VID, PID, and serial number to distinguish

this particular EVM from other instances off this EVM. For example, COM port settings will be

associated with that particular combination of VID, PID, and serial number. Windows presents

the “Found New Hardware” dialog whenever it sees a new combination of these three values.

If the VCP installer setup was run before attaching the EVM, the installation will occur

automatically. If the installer was not run first, guide Windows to the correct INF files within the

installer directory.

SLLU043B

TUSB3410UARTPDK User’s Guide 5

Note that Windows may state that the driver is not certified by Microsoft. TI has verified that the

driver passes Microsoft’s HCT test setup, but to date has not submitted the driver for

certification. Any certification TI acquires will have to be performed again by target companies

prior to their specific product release due to regulations by Microsoft and the USB IF.

Nevertheless, TI is pursuing certification in the first quarter of 2005.

Because the VCP driver architecture contains two modules, one for the USB functionality and

one for the COM port functionality, Windows will present the “Found New Hardware” dialog

twice. For the same reason, you should be able to see the solution enumerate in two places in

the Windows Device Manager when installation is complete. For the Windows 9x driver, it

enumerates as a “VCP device” and also as a new COM port, as shown in Fig. 3.

Figure 3. Enumeration on Windows 98

For the Windows 2000/XP driver, it enumerates as a “multiport serial adapter”, and also as a

new COM port, as shown in Fig. 4.

SLLU043B

6TUSB3410UARTPDK User’s Guide

Figure 4. Enumeration on Windows 2000/XP

The serial device should now be accessible.

2.1 A Note on PIDs for TUSB3410UART EVM

Prior to March 2005, the EVM shipped without an EEPROM device in socket U5. As a result,

the TUSB3410 reported its default VID, PID, and serial number to the host, and the INF files for

the VCP driver were configured to associate with these values. TI provides another driver

(AppLoader) that associates with this same VID/PID pair and has found that many users have

run into conflicts due to having both drivers installed on the same host machine. In addition, TI

is planning to release a new utility in 2Q05 that also uses the default VID/PID.

In order to resolve these common conflicts, as well as enable the use of both the VCP software

and the new utility on the same machine, TI has changed the PID reported by the EVM to

“341A”. An EEPROM is now included on each TUSB3410UART EVM to implement this change.

SLLU043B

TUSB3410UARTPDK User’s Guide 7

NOTE: Starting with v104 of the driver, TI is removing PID “3410” from the VCP driver INF files.

Prior versions of the VCP driver are able to recognize either “3410” or “341A”; v104 and later

versions only recognize “341A”. (See Sec. 2.2 for instructions on determining which version is

installed.)

2.2 Identifying Version of VCP Driver

The firmware and Windows driver are characterized by the same versioning nomenclature.

Although there are no known conflicts when the driver/firmware versions do not match, it is

recommended to use matching versions when possible. For example, the v103 driver should be

used with the v103 firmware. If firmware is not included in the EEPROM – as is the case with

the TUSB3410UART EVM – then firmware is downloaded from the host, and this ensures that

the driver and firmware are of the same version.

To determine the version of the Windows 2000/XP driver, locate the “Multi-port serial” device in

the Device Manager, double-click, and click on the “Driver” tab. Look at the last subfield in the

value of the “Driver Version” field (the number after the last decimal).

Figure 5. Windows Driver Properties

SLLU043B

8TUSB3410UARTPDK User’s Guide

In Fig. 5, this value is “3”. This indicates version v103 of the driver. A “4” would indicate v104,

and so forth.

Prior to v100, there were two digits in this subfield. For example, a “96” indicated v096 of the

driver. (Only two digits are allowed in the field, and the leading 0 is dropped. As a result, this

number rolled to 0 with v100 of the driver.)

Text files within the driver installer also document the version of the driver.

SLLU043B

TUSB3410UARTPDK User’s Guide 9

3EVM Materials

3.1 BOM

Item Reference Designator Part Part Number

1 CN1 Connector-DB9 DB9-HM

8 C1, C13, C14, C15,

C16, C17, C18, C21 1 µF C2012X7R1C105M SMT_0805

1 C2 4.7 µF C3216X7R1C475M SMT_0805

4 C3, C6, C8, C10 0.1 µF C1608X7R1H104K SMT_0603

2 C4, C5 0.01 µF C1608X7R1H103K SMT_0603

2 C9, C7 0.001 µF C1608X7R1H102K SMT_0603

2 C11, C12 22 pF C1608C0G1H220J SMT_0603

2 C20 ,C19 33 pF C1608C0G1H330J SMT_0603

1 D1 sot-23-Diode BAS21ZXCT-ND SOT23-DIODE

1 D2 LED 160-1421-1-ND SMT_0805

1 F2 TDK MPZ2012S331A MPZ2012S331A MPZ2012

2 JP1, JP2 Jumper HDR1X2

1 R1 90.9 kΩP100KCCT-ND SMT_0603

1 R2 100 kΩP100KCCT-ND SMT_0603

1 R3 1.5 kΩP1.50KCCT-ND SMT_0603

2 R4, R5 RES 33.2 OHM 1/10W 1% P33.2HTR-ND 0603 SMD

3 R9, R10, R15 1 kΩP1.00KCCT-ND SMT_0603

1 R11 RES 32.4K OHM 1/10W 1% P32.4KHTR-ND 0603 SMD

1 R12 10 kΩP10.0KCCT-ND SMT_0603

1 R13 15 kΩP15.0KCCT-ND SMT_0603

1 R20 10 kΩP1.50KCCT-ND SMT_0603

1 SW1 Switch 7914G-1-000E MOM-SW

7 TP1, TP2, TP3, TP4,

TP5, TP6, TP9 T point R HDR1X1 TP52

2 TP7, TP8 Test point small TP52

1 U1 TUSB3410 TUSB3410 LQFP-32

1 U2 TPS76933 TPS76933DBVT SOT-5P

1 U3 Type B USB–shield AE1085-ND 4P-B-RECEP

1 U4 SN75LV4737A SN75LV473A SN75LV4737ADB

1 U5 8–pin socket for 24LCxx A400-ND DIP8_SKT

SLLU043B

10 TUSB3410UARTPDK User’s Guide

1 Y1 12–MHz crystal HC49SMD P-16695 CRYSTEK

3.2 Layout

3.3 Schematic

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