19-0677; Rev 0; 11/06
USB-to-COM Port Adapter Board User Guide
USBTO32
General Description
Features
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).
o USB Powered
o USB Driver for Windows 98SE/2000/XP Operating
Systems
o USB and I/O Power LED Indicators
o Two GPIO LED Indicators
o USB Cable Included
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.
o 8-Pin Signal Header
o Proven PCB Layout
o Fully Assembled and Tested
Ordering Information
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.
PC
OPERATING SYSTEMS
SUPPORTED
PART
INTERFACE
USBTO232+
USB
Windows 98SE/2000/XP
Windows is a registered trademark of Microsoft Corp.
+ Denotes lead-free and RoHS compliance.
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
0.01µF 10%, 50V X7R ceramic
capacitor (0603)
TDK C1608X7R1H103K
USB type B right-angle female
receptacle connector
Assmann AU-Y1007-R
C1
1
2
7
1
P1
P2
1
1
47pF 5%, 50V COG ceramic
capacitors (0603)
TDK C1608C0G1H470J
Short DB9 right-angle male
receptacle connector (without
cable-locking screws)
C2, C3
270Ω 5% resistors (0603)
(use lead-free parts only)
0.1µF 10%, 16V X7R ceramic
capacitors (0603)
TDK C1608X7R1C104K
R1, R2
U1
2
1
C4–C8, C11,
C12
USB-to-UART converter
FTDI FT232RL (28-pin SSOP)
4.7µF 10%, 6.3V X5R ceramic
capacitor (0603)
TDK C1608X5R0J475K
U2
—
—
—
1
3
1
1
MAX213EEAI+ (28-pin SSOP)
Shunts
C9
USBTO232+ PCB
1µF 10%, 6.3V X5R ceramic
capacitor (0603)
TDK C1608X5R0J105K
USB high-speed A-to-B 6ft cable
C10
D1
1
1
1
Red LED (0603)
Panasonic LNJ208R8ARA
Component Supplier
Green LED (0603)
Stanley Electric BG1111C-TR
Panasonic LNJ314G8TRA
SUPPLIER
PHONE
WEBSITE
D2
TDK
Note: Indicate the Maxim EV kit that you are using when con-
tacting this component supplier.
40Ω @ 100MHz, 1.5A ferrite bead
(0805)
FB1
1
Steward MI0805K400R-10
H1
1
3
8-pin header
3-pin headers
JU1, JU2, JU3
________________________________________________________________ Maxim Integrated Products
1
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USB-to-COM Port Adapter Board User Guide
USBTO32
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.
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
Figure 1. Windows XP: Found New Hardware Wizard |Welcome Window
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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.
USBTO32
Figure 2. Windows XP: Found New Hardware Wizard | FTDI FT8U2XX Device Window
4
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USBTO32
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.
Figure 3. Windows XP: Found New Hardware Wizard | Search Options Window
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4) The Found New Hardware Wizard | Complete win-
dow appears (Figure 4). Press the Finish button.
USBTO32
Figure 4. Windows XP: Found New Hardware Wizard | Complete Window
6
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USBTO32
5) A Found New Hardware Wizard | Welcome win-
dow 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
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7
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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.
USBTO32
Figure 6. Windows XP: Found New Hardware Wizard | USB Serial Port Window
8
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USBTO32
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.
Figure 7. Windows XP: Found New Hardware Wizard | Search Options Window
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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.
USBTO32
Figure 8. Windows XP: Found New Hardware Wizard | Complete Window
10 ______________________________________________________________________________________
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USBTO32
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.
Figure 9. Windows 2000: Found New Hardware Window
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2) A Found New Hardware Wizard | Welcome window
then appears (Figure 10). Press the Next button.
USBTO32
Figure 10. Windows 2000: Found New Hardware Wizard | Welcome Window
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USBTO32
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.
Figure 11. Windows 2000: Found New Hardware Wizard | Install Hardware Device Drivers Window
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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.
USBTO32
Figure 12. Windows 2000: Found New Hardware Wizard | Locate Driver Files Window
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USBTO32
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.
Figure 13. Windows 2000: Found New Hardware Wizard | Path Window
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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.
USBTO32
Figure 14. Windows 2000: Found New Hardware Wizard | Driver Files Search Results Window
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USBTO32
7) At the Found New Hardware Wizard | Complete
window (Figure 15), press the Finish button.
Figure 15. Windows 2000: Found New Hardware Wizard | Complete Window
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8) A Found New Hardware window appears for the
USB Serial Port, as shown in Figure 16.
USBTO32
Figure 16. Windows 2000: Found New Hardware Window
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USBTO32
9) When the Found New Hardware Wizard |
Welcome window appears (Figure 17), press the
Next button.
Figure 17. Windows 2000: Found New Hardware Wizard | Welcome Window
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USB-to-COM Port Adapter Board User Guide
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.
USBTO32
Figure 18. Windows 2000: Found New Hardware Wizard | Install Hardware Device Drivers Window
20 ______________________________________________________________________________________
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USBTO32
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.
Figure 19. Windows 2000: Found New Hardware Wizard | Locate Driver Files Window
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12) At the Found New Hardware Wizard | Path win-
dow (Figure 20), press the Browse button and
choose the path C:\Program Files\MAXxxxxx.
Press the OK button when finished.
USBTO32
Figure 20. Windows 2000: Found New Hardware Wizard | Path Window
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13) The Found New Hardware Wizard | Driver Files
Search Results window ( Figure 21) appears. Press
the Next button after the wizard finds the driver.
Figure 21. Windows 2000: Found New Hardware Wizard | Driver Files Search Results Window
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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.
USBTO32
Figure 22. Windows 2000: Found New Hardware Wizard | Complete Window
24 ______________________________________________________________________________________
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USBTO32
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.
Figure 23. Windows 98SE: Add New Hardware Wizard | Start Window
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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.
USBTO32
Figure 24. Windows 98SE: Add New Hardware Wizard | Options Window
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USBTO32
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.
Figure 25. Windows 98SE: Add New Hardware Wizard | Specify Location Window
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4) The Add New Hardware Wizard | Search window
appears (Figure 26). Press the Next button once
the driver has been located.
USBTO32
Figure 26. Windows 98SE: Add New Hardware Wizard | Search Window
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USBTO32
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.
Figure 27. Windows 98SE: Add New Hardware Wizard | Complete Window
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USBTO32
Figure 28. USBTO232 Schematic
30 ______________________________________________________________________________________
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USBTO32
Figure 29. USBTO232 Component Placement Guide—Component Side
Figure 30. USBTO232 PCB Layout—Component Side
Figure 31. USBTO232 PCB Layout—Solder Side
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
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