Maxim USBTO232 User Manual

General Description

The USBTO232 is an adapter board that converts a
PC’s USB port into a standard COM port. A COM port is
also known as the standard serial port that uses
Recommended Standard 232 (RS-232).

The USBTO232 is included with selected Maxim EV kits
and EV systems that were originally designed for the
PC COM port and later updated to also support the
USB port. Data sheets for EV kits and EV systems that
can use the USBTO232 have been updated to reflect
compatibility and also provide ordering information.
Use of the USBTO232 in applications other than those
EV kits specified by Maxim is not supported.

Important: Before using the USBTO232, see the

Quick

Start

section of this data sheet to correctly install the
USB driver for the appropriate Windows®operating
system.

Features

 USB Powered

 USB Driver for Windows 98SE/2000/XP Operating

Systems

 USB and I/O Power LED Indicators

 Two GPIO LED Indicators

 USB Cable Included

 8-Pin Signal Header

 Proven PCB Layout

 Fully Assembled and Tested

USBTO232

USB-to-COM Port Adapter Board User Guide

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

19-0677; Rev 0; 11/06

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

+

Denotes lead-free and RoHS compliance.

Component List

Windows is a registered trademark of Microsoft Corp.

Note: Indicate the Maxim EV kit that you are using when con­tacting this component supplier.

Component Supplier

DESIGNATION QTY DESCRIPTION

0.01µF ±10%, 50V X7R ceramic

C1 1

C2, C3 2

capacitor (0603)
TDK C1608X7R1H103K

47pF ±5%, 50V COG ceramic
capacitors (0603)
TDK C1608C0G1H470J

PART

PC

INTERFACE

USBTO232+ USB Windows 98SE/2000/XP

OPERATING SYSTEMS

SUPPORTED

DESIGNATION QTY DESCRIPTION

USB type B right-angle female

P1 1

P2 1

receptacle connector
Assmann AU-Y1007-R

Short DB9 right-angle male
receptacle connector (without
cable-locking screws)

C4–C8, C11,

C12

C9 1

C10 1

D1 1

D2 1

FB1 1

H1 1 8-pin header

JU1, JU2, JU3 3 3-pin headers

0.1µF ±10%, 16V X7R ceramic
capacitors (0603)

7

TDK C1608X7R1C104K

4.7µF ±10%, 6.3V X5R ceramic
capacitor (0603)
TDK C1608X5R0J475K

1µF ±10%, 6.3V X5R ceramic
capacitor (0603)
TDK C1608X5R0J105K

Red LED (0603)
Panasonic LNJ208R8ARA

Green LED (0603)
Stanley Electric BG1111C-TR
Panasonic LNJ314G8TRA

40Ω @ 100MHz, 1.5A ferrite bead
(0805)
Steward MI0805K400R-10

R1, R2 2

U1 1

U2 1 MAX213EEAI+ (28-pin SSOP)

— 3 Shunts

— 1 USBTO232+ PCB

— 1 USB high-speed A-to-B 6ft cable

SUPPLIER PHONE WEBSITE

TDK 847-803-6100 www.component.tdk.com

270Ω ±5% resistors (0603)
(use lead-free parts only)

USB-to-UART converter
FTDI FT232RL (28-pin SSOP)

USBTO232

2 _______________________________________________________________________________________

Quick Start

The following instructions are for installing USB drivers
and the EV kit software. Once the USB drivers and EV
kit software have been installed, refer to the

Quick Start

section of the appropriate EV kit data sheet for EV kit­specific instructions.

Recommended Equipment

• USBTO232 board (USB cable included)

• Maxim EV kit (or EV system) with a COM port PC

connection

• Corresponding EV kit data sheet

• User-supplied PC with a USB port

Note: In the following sections, software-related items
are identified by bolding. Text in bold refers to items
directly from the EV kit software. Text in bold

and

underlined refers to items from the Windows

98SE/2000/XP operating system.

Procedure

1) Visit the Maxim website (www.maxim-ic.com/evkit-

software) to download the latest version of the EV
kit software that supports USB. Save the EV kit soft­ware to a temporary folder and uncompress the file,
if it is a .zip file.

2) Install the EV kit software on your computer by run-

ning the INSTALL.EXE program inside the tempo­rary folder. The program files are copied to
C:\Program Files\MAXxxxxx and icons are creat­ed in the Windows Start | Programs

menu.

3) Uncompress the USB driver file copied into

C:\Program Files\MAXxxxxx after the software is
installed. If you are using Windows 98SE, uncom­press the USB_Driver_98_ME_V1.09.zip file. If you
are using Windows 2000/XP, uncompress the
USB_Driver_XP_2K_V2.00.zip file. Uncompress
the contents of the .zip file into C:\Program
Files\MAXxxxxx.

4) Verify that the following USBTO232 jumpers are in

the default positions:

JU1: (1-2)

JU2: (2-3)

JU3: (2-3)

5) Connect the included USB cable from the PC’s USB

port (Type A) to the Type B USB connector on the
USBTO232 board.

6) Verify that the red VCC power LED (D1) lights up.

Also verify that the green VCCIO power LED (D2)
lights up.

7) Go to the appropriate USB

Driver Installation

sec­tion in this data sheet for the version of Windows
you are using and return to step 8 when finished.
For example, if you are using Windows XP, go to
the

Windows XP USB Driver Installation

section.

Windows XP: Page 3

Windows 2000: Page 11

Windows 98SE: Page 25

8) Connect the USBTO232 board to the EV kit (or EV
system) by connecting the male DB9 connector on
the USBTO232 board to the female DB9 connector
on the EV kit.

9) Refer to the

Quick Start

section of the appropriate EV

kit data sheet for further EV kit-specific instructions.

Detailed Description of Hardware

The USBTO232 is an adapter board that converts a
PC’s USB port into a standard COM port. The
USBTO232 board has three configurable jumpers: JU1,
JU2, and JU3. Jumper JU1 is the I/O supply selection
(see Table 1), jumper JU2 is the USB power-supply
indicator (see Table 2), and jumper JU3 is the 3.3V
power-supply indicator (see Table 3).

Table 1. I/O Supply Selection (VCCIO)

*

Default position.

Table 2. USB Power-Supply Indicator
(VCC–D1)

*

Default position.

Table 3. 3.3V Power-Supply Indicator
(VCC30–D2)

*

Default position.

USB-to-COM Port Adapter Board User Guide

JUMPER SHUNT POSITION DESCRIPTION

JU1

JUMPER SHUNT POSITION DESCRIPTION

JU2

JUMPER SHUNT POSITION DESCRIPTION

JU3

1-2* VCCIO = VCC = 5V

2-3 VCCIO = VCC30 = 3.3V

1-2

2-3*

1-2

2-3*

General-purpose LED
connected to CBUS0

Indicates USB power present
when red LED (D1) is lit

General-purpose LED
connected to CBUS1

Indicates regulated 3.3V
power present when green
LED (D2) is lit

USBTO232

USB-to-COM Port Adapter Board User Guide

_______________________________________________________________________________________ 3

Windows XP USB Driver Installation

1) Once the USBTO232 board is connected to the PC
for the first time in Windows XP, a Found New
Hardware Wizard | Welcome window appears, as
shown in Figure 1. Choose the No, not this time
selection and press the Next button to get started. If
you do not see a window that is similar to the one

described above after 30 seconds, remove the USB
cable from the USBTO232 board and reconnect it.
Administrator privileges are required to install the USB
device driver on Windows 2000/XP.

Figure 1. Windows XP: Found New Hardware Wizard |Welcome Window

USBTO232

2) A Found New Hardware Wizard | FTDI FT8U2XX
Device window (Figure 2) appears next. This win-

dow asks What do you want the wizard to do?.
Choose the Install from a list or specific location
(Advanced) option and press the Next button.

Figure 2. Windows XP: Found New Hardware Wizard | FTDI FT8U2XX Device Window

USB-to-COM Port Adapter Board User Guide

4 _______________________________________________________________________________________

_______________________________________________________________________________________ 5

3) At the Found New Hardware Wizard | Search
Options window (Figure 3), choose the Search for
the best driver in these locations option and

check the Include this location in the search
checkbox. Press the Browse button and navigate
to the path: C:\Program Files\MAXxxxxx (where
xxxxx represents the Maxim IC part number on the

EV kit being evaluated). Press the Next button
when finished.

USBTO232

USB-to-COM Port Adapter Board User Guide

Figure 3. Windows XP: Found New Hardware Wizard | Search Options Window

USBTO232

USB-to-COM Port Adapter Board User Guide

6 _______________________________________________________________________________________

4) The Found New Hardware Wizard | Complete win­dow appears (Figure 4). Press the Finish button.

Figure 4. Windows XP: Found New Hardware Wizard | Complete Window

USBTO232

USB-to-COM Port Adapter Board User Guide

_______________________________________________________________________________________ 7

5) A Found New Hardware Wizard | Welcome win­dow appears again (Figure 5). Choose the No, not
this time selection and press the Next button.

Figure 5. Windows XP: Found New Hardware Wizard | Welcome Window

USBTO232

6) The next window is the Found New Hardware
Wizard | USB Serial Port window (Figure 6). This
window asks What do you want the wizard to
do?. Choose the Install from a list or specific
location (Advanced) option and press the Next

button.

USB-to-COM Port Adapter Board User Guide

8 _______________________________________________________________________________________

Figure 6. Windows XP: Found New Hardware Wizard | USB Serial Port Window

7) At the Found New Hardware Wizard | Search

Options window (Figure 7), choose the Search for
the best driver in these locations option and

check the Include this location in the search
checkbox. Press the Browse button and navigate
to the path: C:\Program Files\MAXxxxxx. Press
the Next button when finished.

USBTO232

USB-to-COM Port Adapter Board User Guide

_______________________________________________________________________________________ 9

Figure 7. Windows XP: Found New Hardware Wizard | Search Options Window

USBTO232

8) The next window is the Found New Hardware
Wizard | Complete window (Figure 8). Press the
Finish button.

9) When finished, return to step 8 of the USBTO232

Quick Start

section.

USB-to-COM Port Adapter Board User Guide

10 ______________________________________________________________________________________

Figure 8. Windows XP: Found New Hardware Wizard | Complete Window

Windows 2000 USB Driver Installation

1) Once the USBTO232 board is connected to the PC
for the first time in Windows 2000, a Found New
Hardware window appears, as shown in Figure 9.

USBTO232

USB-to-COM Port Adapter Board User Guide

______________________________________________________________________________________ 11

Figure 9. Windows 2000: Found New Hardware Window

USBTO232

2) A Found New Hardware Wizard | Welcome window
then appears (Figure 10). Press the Next button.

USB-to-COM Port Adapter Board User Guide

12 ______________________________________________________________________________________

Figure 10. Windows 2000: Found New Hardware Wizard | Welcome Window

3) At the Found New Hardware Wizard | Install
Hardware Device Drivers window (Figure 11),
choose Search for a suitable driver for my device
(recommended) and press the Next button when
finished.

USBTO232

USB-to-COM Port Adapter Board User Guide

______________________________________________________________________________________ 13

Figure 11. Windows 2000: Found New Hardware Wizard | Install Hardware Device Drivers Window

USBTO232

4) The Found New Hardware Wizard | Locate Driver
Files window appears next (Figure 12). Check the
Specify a location checkbox and press the Next

button when finished.

USB-to-COM Port Adapter Board User Guide

14 ______________________________________________________________________________________

Figure 12. Windows 2000: Found New Hardware Wizard | Locate Driver Files Window

5) The next window is the Found New Hardware

Wizard | Path window (Figure 13). Press the
Browse button and choose the path C:\Program
Files\MAXxxxxx. Press the OK button when finished.

USBTO232

USB-to-COM Port Adapter Board User Guide

______________________________________________________________________________________ 15

Figure 13. Windows 2000: Found New Hardware Wizard | Path Window

USBTO232

6) The Found New Hardware Wizard | Driver Files
Search Results window is shown in Figure 14. Press
the Next button after the wizard finds the driver.

USB-to-COM Port Adapter Board User Guide

16 ______________________________________________________________________________________

Figure 14. Windows 2000: Found New Hardware Wizard | Driver Files Search Results Window

7) At the Found New Hardware Wizard | Complete
window (Figure 15), press the Finish button.

USBTO232

USB-to-COM Port Adapter Board User Guide

______________________________________________________________________________________ 17

Figure 15. Windows 2000: Found New Hardware Wizard | Complete Window

USBTO232

8) A Found New Hardware window appears for the
USB Serial Port, as shown in Figure 16.

USB-to-COM Port Adapter Board User Guide

18 ______________________________________________________________________________________

Figure 16. Windows 2000: Found New Hardware Window

9) When the Found New Hardware Wizard |

Welcome window appears (Figure 17), press the
Next button.

USBTO232

USB-to-COM Port Adapter Board User Guide

______________________________________________________________________________________ 19

Figure 17. Windows 2000: Found New Hardware Wizard | Welcome Window

USBTO232

10) At the Found New Hardware Wizard | Install
Hardware Device Drivers window (Figure 18),
choose Search for a suitable driver for my device
(recommended) and press the Next button when

finished.

USB-to-COM Port Adapter Board User Guide

20 ______________________________________________________________________________________

Figure 18. Windows 2000: Found New Hardware Wizard | Install Hardware Device Drivers Window

11) The Found New Hardware Wizard | Locate Driver

Files window (Figure 19) appears. Check the
Specify a location checkbox and press the Next

button when finished.

USBTO232

USB-to-COM Port Adapter Board User Guide

______________________________________________________________________________________ 21

Figure 19. Windows 2000: Found New Hardware Wizard | Locate Driver Files Window

USBTO232

12) At the Found New Hardware Wizard | Path win­dow (Figure 20), press the Browse button and
choose the path C:\Program Files\MAXxxxxx.
Press the OK button when finished.

USB-to-COM Port Adapter Board User Guide

22 ______________________________________________________________________________________

Figure 20. Windows 2000: Found New Hardware Wizard | Path Window

13) The Found New Hardware Wizard | Driver Files
Search Results window ( Figure 21) appears. Press
the Next button after the wizard finds the driver.

USBTO232

USB-to-COM Port Adapter Board User Guide

______________________________________________________________________________________ 23

Figure 21. Windows 2000: Found New Hardware Wizard | Driver Files Search Results Window

USBTO232

14) The next window is the Found New Hardware
Wizard | Complete window (Figure 22). Press the
Finish button.

15) When finished, return to step 8 of the USBTO232

Quick Start

section.

USB-to-COM Port Adapter Board User Guide

24 ______________________________________________________________________________________

Figure 22. Windows 2000: Found New Hardware Wizard | Complete Window

Windows 98SE USB Driver Installation

1) Once the USBTO232 board is connected to the PC
for the first time in Windows 98SE, an Add New
Hardware Wizard | Start window appears, as
shown in Figure 23. Press the Next button to get
started.

USBTO232

USB-to-COM Port Adapter Board User Guide

______________________________________________________________________________________ 25

Figure 23. Windows 98SE: Add New Hardware Wizard | Start Window

USBTO232

2) An Add New Hardware Wizard | Options window
appears next (Figure 24). Choose the Search for

the best driver for your device (Recommended)
option and press the Next button when finished.

USB-to-COM Port Adapter Board User Guide

26 ______________________________________________________________________________________

Figure 24. Windows 98SE: Add New Hardware Wizard | Options Window

3) At the Add New Hardware Wizard | Specify

Location window (Figure 25), check the Specify a
location checkbox and press the Browse button.
Choose the path C:\Program Files\MAXxxxxx\
R10906 (where xxxxx represents the Maxim IC part

number on the EV kit being evaluated). Press the
Next button when finished.

USBTO232

USB-to-COM Port Adapter Board User Guide

______________________________________________________________________________________ 27

Figure 25. Windows 98SE: Add New Hardware Wizard | Specify Location Window

USBTO232

4) The Add New Hardware Wizard | Search window
appears (Figure 26). Press the Next button once
the driver has been located.

USB-to-COM Port Adapter Board User Guide

28 ______________________________________________________________________________________

Figure 26. Windows 98SE: Add New Hardware Wizard | Search Window

5) The next window is the Add New Hardware Wizard
| Complete window (Figure 27). Press the Finish
button to complete the driver installation.

6) When finished, return to step 8 of the USBTO232

Quick Start

section.

USBTO232

USB-to-COM Port Adapter Board User Guide

______________________________________________________________________________________ 29

Figure 27. Windows 98SE: Add New Hardware Wizard | Complete Window

USBTO232

USB-to-COM Port Adapter Board User Guide

30 ______________________________________________________________________________________

Figure 28. USBTO232 Schematic

P2

P2-1

P2-2

P2-3

P2-4

P2-5

P2-6

P2-7

P2-8

DB9 TYPE DTE

P2-9

23

6

3

RI

IN

R4

MAX213

IN

T2

RTS#

DSR

22

7

1

15

RI#

OUT

R4

IN

T1

TXD

USBDP

RTS

21

IN

T4

OUT

R1

8

9

DSR#

U1

DCD

RXDATA

CTS

27

28

IN

OUT

R3

T4

OUT

OUTT2OUT

T3

T1

1

2

DTR

TXDATA

VCC

DTR

TXDATA

CTS#

SLEEP#

VCC

26

24

25

EN

OUT

SHDN

R3

U2

IN

OUT

R2

R2

5

3

4

RTS

RXDATA

VCC30

5

RXD

3

JU1

2

4

VCCI0

1

USBDM

16

20

9

H1

FT232RL

N.C.

8

CTS

DTR#

19

IN

T3

IN

R1

VCC

DSR

H1-1

HEADER 8 PIN

VCC

20

VCC

24

DCD#

OUT

R5

11

N.C.

RI

C6

0.1µF

GND GND TEST

AGND GND

CBUS1

1

JU3

2
3

D2

3
2

JU2

1

D1

CBUS0

H1-8

25 7182126

DCD

18

IN

R5

CC

V

C10

1µF

C4

0.1µF

CBUS0

C12

0.1µF

OSCI

27

17V-16

13

H1-2

23

CBUS0

V+

12

CBUS1

28

C1+

22

OSCO

C7

C2-

C5

H1-3

CBUS1

0.1µF

14

0.1µF

CBUS2

12

15

C2+

H1-4

13

CBUS2

CBUS4

GND10C1-

CBUS3

10

14

DCD#

H1-5

CBUS3

VCC30

VCC

VCC30

6

17

RI#

H1-6

C11

3V3OUT

R2

270Ω

R1

270Ω

H1-7

RESET#

0.1µF

19

RESET#

CTS#

DTR#

2

11

VCC

P1

FB1

USB TYPE B

P1-1

C1

0.01µF

P1-2

C3

C2

47pF

P1-3

47pF

P1-4

SLEEP#

DCD#

RI#

CTS#

DTR#

VCC

C9

4.7µF

C8

0.1µF

USBTO232

USB-to-COM Port Adapter Board User Guide

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________

31

© 2006 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

CARDENAS

Figure 29. USBTO232 Component Placement Guide—Component Side

Figure 30. USBTO232 PCB Layout—Component Side Figure 31. USBTO232 PCB Layout—Solder Side