The CP2112EK evaluation kit allows a complete evaluation and customization of the CP2112 HID USB to SMBus/I²C Bridge, including all GPIO functions, transmit LEDs, receive LEDs and clock output. A USB cable, Windows® and Mac® application examples and full documentation are included.

The Silicon Labs HID USB to SMBus interface library provides a simple API to configure and operate CP2112 devices. The library provides an interface abstraction so that users can develop their application at a higher level than the USB HID layer. This HID USB to SMBus library is a Windows DLL implementation of the CP2112 interface specification.
Refer to the following application notes for more details on the Windows and Mac HID libraries:
AN495: CP2112 Interface Specification
AN496: CP2112 HID-to-SMBus API Specification