AN220
USB DRIVER CUSTOMIZATION
Relevant Devices
This application note applies to the following devices:
CP2101/2/3/4/5, C8051F320/1/6/7, C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D, C8051F380/1/2/3/4/5/6/7,
C8051T320/1/2/3/6/7, C8051T620/1/2/3
When the device is connected to the PC for the first
1. Introduction
time, the drivers will be installed with little interaction
from the user.
The information in this document and the associated
software download is intended for use by developers
creating USB products based on the CP210x USB-to-
UART Bridge Controller device family or the
C8051F32x, C8051F34x, C8051F38x, C8051T32x, and
C8051T62x USB MCU device families A Virtual COM
Port Driver is available for the CP210x family and is
included with the purchase of a CP210x Evaluation Kit.
Additionally, drivers can be created using the
USBXpress™ development kit for the CP210x,
C8051F32x, C8051F34x, C8051F38x, C8051T32x, and
C8051T62x device families. This document describes
Note: A customized installation does not contain certified
drivers for Windows XP/2003/Vista/7. Certification
must be performed by Microsoft for the new driver
installation. An uncertified installation will not cause
any other problems other than the warning message
displayed by Windows XP/2003/Vista when installing
uncertified drivers. Uncertified drivers cannot be
installed in Windows 7 unless they are installed with a
testing certificate or the Ignore Serial Signing option is
enabled by pressing F8 on startup and selecting the
corresponding option.
To run the Custom USB Driver Installation Wizard, open
CustomUSBDriverWizard.exe, which is included in the
AN220SW.zip download. Figure 1 shows the first
screen of the Custom USB Driver Installation Wizard.
Choose the type of driver installation desired. For
detailed instructions on creating a custom driver
installation, see “4. Creating a Custom Driver”. This
description goes through the process of customizing a
®
the steps necessary to customize the Windows device
driver installation using the Custom USB Driver
Installation Wizard.
2. Customizing Driver Installations
The driver installation is customizable by modifying
certain sections of the hardware installation files (.inf).
The strings contained in the .inf files affect what is
displayed in the “Found New Hardware Wizard” dialogs,
Device Manager, and the Registry. The changes to the
VID and PID in the driver installation should match the
VID and PID contained in the EPROM/FLASH of your
product. See “AN144: CP21xx Device Customization
Guide” for more information on changing the VID and
PID for your product.
CP210x driver. The process for creating
a
USBXpress™ driver is the same as this description,
only select “USBXpress Driver” on the starting screen of
the wizard.
Note: Any changes to the Windows installation .inf files will
require new Windows Hardware Quality Labs (WHQL)
tests.
3. Using the Custom USB Driver
Installation Wizard
The Custom USB Driver Installation Wizard generates a
custom driver installation for distribution to end-users.
This customized installation consists of modified .inf
files, optional installation support files, and driver files
for Windows 2000/XP/Server 2003/Vista/Windows 7.
The optional installation executable provided can be
used to copy driver files and register a device on a PC
before or after the device has been connected. It will
also add an entry in the add/remove programs listing.
Figure 1. Driver Installation Selection
Copyright © 2011 by Silicon Laboratories AN220
Rev. 0.6 3/11
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