Texas Instruments TUSB3410UARTPDK User manual

Application Report
SLLU043B – JANUARY 2006
1
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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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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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.

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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.

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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.

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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

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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.

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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

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1 Y1 12–MHz crystal HC49SMD P-16695 CRYSTEK
3.2 Layout
3.3 Schematic