CP2105EK Silicon Laboratories Inc, CP2105EK Datasheet - Page 17

• Manufacturer Part Number: CP2105EK
• Description: KIT EVAL FOR CP2105
• Manufacturer: Silicon Laboratories Inc

Specifications of CP2105EK

• Main Purpose: Interface, Dual USB 2.0 to UART (RS485) Bridge
• Embedded: No
• Utilized Ic / Part: CP2105
• Primary Attributes: Full Speed (12Mbps)
• Secondary Attributes: LED Status Indicators
• Interface Type: RS-232, USB
• Operating Supply Voltage: 3.3 V
• Product: Interface Development Tools
• For Use With/related Products: CP2105
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 336-2005

9. One-Time Programmable ROM
The CP2105 includes an internal one-time programmable ROM that may be used to customize the USB Vendor ID
(VID), Product ID (PID), Product Description String, Power Descriptor, Device Release Number, Interface Strings,
and Device Serial Number as desired for OEM applications. If the programmable ROM has not been programmed,
the default configuration data shown in Table 13 and Table 14 is used.
While customization of the USB configuration data is optional, customizing the VID/PID combination is strongly
recommended. A unique VID/PID combination will prevent the driver from conflicting with any other USB driver
from a different manufacturer’s product. A vendor ID can be obtained from www.usb.org or Silicon Labs can
provide a free PID for the OEM product that can be used with the Silicon Labs VID. Customizing the serial string for
each individual device is also recommended if the OEM application is one in which it is possible for multiple
CP210x-based devices to be connected to the same PC.
The configuration data ROM can be programmed by Silicon Labs prior to shipment with the desired configuration
information. It can also be programmed in-system over the USB interface by adding a capacitor to the PCB. If the
configuration ROM is to be programmed in-system, a 4.7 µF capacitor must be added between the NC/DCD_ECI/
VPP pin and ground. No other circuitry should be connected to NC/DCD_ECI/VPP during a programming
operation, and V
Vendor ID
Product ID
Power Descriptor (Attributes)
Power Descriptor (Max. Power) 32h (100 mA)
Release Number
Serial String
Product Description String
ECI Interface String
ECI Operating Mode
SCI Interface String
SCI Operating Mode
DD
GPIO.0_ECI/DTR_ECI
GPIO.1_ECI/DSR_ECI
GPIO.0_SCI/DCD_SCI
GPIO.1_SCI/DTR_SCI
GPIO.2_SCI/DSR_SCI
Flush_Buffers
SUSPEND/RI_ECI
SUSPEND/RI_SCI
RS-485 Level
Name
Table 14. Default GPIO, UART, and Suspend Configuration Data
must remain at 3.3 V or higher to successfully write to the configuration ROM.
Name
Table 13. Default USB Configuration Data
10C4h
EA70h
80h (Bus-powered)
0100h (Release Version 01.00)
Unique 8 character ASCII string (16 characters maximum)
“CP2105 USB to UART Bridge Controller” (47 characters maximum)
“Enhanced COM Port” (32 characters maximum)
GPIO mode
“Standard COM Port” (32 characters maximum)
GPIO mode
GPIO Input
GPIO Input
GPIO Input
GPIO Input
GPIO Input
Flush ECI and SCI TX and RX FIFO on open
Push-pull, Active-Low
Push-pull, Active-Low
Active-High
Rev. 1.0
Value
Value
CP2105
17