CP2112EK Silicon Laboratories Inc, CP2112EK Datasheet - Page 15

• Manufacturer Part Number: CP2112EK
• Description: KIT EVAL FOR CP2112
• Manufacturer: Silicon Laboratories Inc

Specifications of CP2112EK

• Main Purpose: Interface, USB 2.0 to SMBus Bridge
• Embedded: No
• Utilized Ic / Part: CP2112
• Primary Attributes: Full Speed (12Mbps)
• Secondary Attributes: LED Status Indicators
• Interface Type: USB
• Operating Supply Voltage: 3.3 V
• Product: Interface Development Tools
• For Use With/related Products: CP2112
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 336-2010

8. One-Time Programmable ROM
The CP2112 includes an internal, one-time programmable ROM that may be used to customize the USB vendor ID
(VID), product ID (PID), manufacturer string, product description string, power descriptor, device release number,
and device serial number as desired for OEM applications. If the programmable ROM has not been customized,
the default configuration data shown in Table 11 is used.
While customization of the USB configuration data is optional, customizing the VID/PID combination is strongly
recommended. A unique VID/PID will prevent the device from being recognized by any other manufacturer’s
software application. 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 CP2112-based devices to be
connected to the same PC.
“AN495: CP2112 Interface Specification” includes more information about the programmable values and their valid
options. Note that certain items in the PROM are programmed as a group, and programming one of these items in
a group prevents further programming of any of the other items in the group.
The configuration data ROM is programmable 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
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 V
3.3 V or higher to successfully write to the configuration ROM.
Vendor ID
Product ID
Power Descriptor (Attributes)
Power Descriptor (Max. Power)
Release Number
Manufacturer String
Product Description String
Serial String
Name
Table 11. Default USB Configuration Data
10C4h
EA90h
80h (Bus-powered)
32h (100 mA)
0100h (Release Version 01.00)
“Silicon Laboratories” (30 ASCII characters maximum)
“CP2112 HID USB-to-SMBus Bridge” (30 ASCII characters maximum)
Unique 8-character ASCII string (30 ASCII characters maximum)
Rev. 1.0
Value
DD
must remain at
CP2112
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