CP2101 Datasheet, PDF (12/14 Pages) List of Unclassifed Manufacturers – Single-Chip USB to UART Bridge

CP2101
Preliminary
7. INTERNAL EEPROM
The CP2101 includes an internal EEPROM which may be used to customize the USB Vendor ID, Product ID, Product
Description String, Power Descriptor, Device Release Number and Device Serial Number as desired for OEM applica-
tions. Customization of the USB configuration data is optional. If the EEPROM is not programmed with OEM data,
the default configuration data shown in Table 6.1 is used. Note, however, a unique serial number is required for OEM
applications in which it is possible for multiple CP2101-based devices to be connected to the same PC.
The internal EEPROM is programmed via the USB. This allows the OEM's USB configuration data and serial num-
ber to be written to the CP2101 on-board during the manufacturing and testing process. A stand-alone utility for pro-
gramming the internal EEPROM is available from Cygnal. A library of routines provided in the form of a Windows
DLL is also available. This library can be used to integrate the EEPROM programming step into custom software
used by the OEM to streamline testing and serial number management during manufacturing. The EEPROM has a
typical endurance of 100,000 write cycles with a data retention of 100 years.
Table 7.1. Default USB Configuration Data
NAME
VALUE
Vendor ID
10C4h
Product ID
EA60h
Power Descriptor (Attributes) 80h
Power Descriptor (Max. Power) 0Fh
Release Number
0100h
Serial Number
0001 (63 characters maximum)
Product Description String
“Cygnal CP2101 USB to UART Bridge Controller” (126 characters maximum)
8. VIRTUAL COM PORT DEVICE DRIVERS
The CP2101 Virtual COM Port (VCP) device drivers allow a CP2101-based device to appear to the PC's application
software as an additional COM port (in addition to any existing hardware COM ports). Application software running
on the PC accesses the CP2101-based device as it would access a standard hardware COM port. However, actual data
transfer between the PC and the CP2101 device is performed over the USB. Therefore, existing COM port applica-
tions may be used to transfer data via the USB to the CP2101-based device without modifying the application. Con-
tact Cygnal Integrated Products for the latest list of supported operating systems.
Note: the Cygnal VCP device drivers are required for device operation and are only distributed as part of the CP2101
Evaluation Kit (Part Number: CP2101EK). Contact any of Cygnal's sales representatives or go to www.cygnal.com
to order the CP2101 Evaluation Kit.
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DS014-1.0 AUG03 © 2003 Cygnal Integrated Products, Inc.