CP2109-A01-GM View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

CP2109-A01-GM

SINGLE-CHIP USB-TO-UART BRIDGE

Silicon Laboratories 

CP2102/9

8. Internal Programmable ROM

The CP2102 includes an internal electrically erasable programmable read-only memory (EEPROM), and the

CP2109 includes an internal one-time programmable (OTP) erasable programmable read-only memory (EPROM).

Either may be used to customize the USB Vendor ID (VID), Product ID (PID), Product Description String, Power

Descriptor, Device Release Number and Device Serial Number as desired for OEM applications. If the EEPROM/

EPROM is not programmed with OEM data, the default configuration data shown in Table 13 is used. The

EEPROM has a typical endurance of 100,000 write cycles with a data retention of 100 years. The EPROM can only

be written one time and cannot be erased.

While customization of the USB configuration data is optional, it is recommended to customize the VID/PID

combination. A unique VID/PID combination will prevent the driver from conflicting with any other USB driver. A

vendor ID can be obtained from http://www.usb.org/ or Silicon Laboratories can provide a free PID for the OEM

product that can be used with the Silicon Laboratories VID. It is also recommended to customize the serial number

if the OEM application is one in which it is possible for multiple CP2102/9-based devices to be connected to the

same PC.

The internal programmable ROM is programmed via the USB. This allows the OEM's USB configuration data and

serial number to be written to the CP2102/9 on-board ROM during the manufacturing and testing process. A stand-

alone utility for programming the internal programmable ROM is available from Silicon Laboratories. A library of

routines provided in the form of a Windows® DLL is also available. This library can be used to integrate the

programmable ROM programming step into custom software used by the OEM to streamline testing and serial

number management during manufacturing.

USB descriptors can be locked to prevent future modification on the CP2102. The CP2109 can be programmed in-

system over the USB interface by adding a capacitor to the PCB. If configuration ROM is to be programmed in-

system, a 4.7 μF capacitor must be added between the VPP pin and ground. No other circuitry should be

connected to VPP during a programming operation, and VDD must remain at 3.3 V or higher to successfully

write to the configuration ROM.

Table 13. Default USB Configuration Data

Name

Vendor ID

Product ID

Power Descriptor (Attributes)

Power Descriptor

(Max. Power)

Release Number

CP2102 Serial Number

CP2109 Serial Number

CP2102 Product Description String

CP2109 Product Description String

10C4h

EA60h

80h

32h

Value

0100h

0001 (63 characters maximum)

Unique 8 character ASCII string (63 characters maximum)

“CP2102 USB to UART Bridge Controller” (126 characters maximum)

“CP2109 USB to UART Bridge Controller” (126 characters maximum)

Rev. 1.8

17

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