You have to write the firmware in the keil compiler and while compiling it you can create a hex file as well as iic file. Please refer the attached document Chapter 8.
You can call the command provided in the figure 8.3 from the command prompt also to create a iic file from the hex file.
I got bitten by an old version of hex2bix. Also, the readme in [Install dir]\USB\CY3684_EZ-USB_FX2LP_DVK\1.1\Utilities\Hex2Bix lacks the options needed here.
The appropriate invocation should be something like this:
hex2bix -F 0xC0 -V 0x7918 -P 0x0110 -M 16384 -I -O outputFile.iic sourceFile.hex
There is no option to set the product version number. The first three flags are First byte, VID and PID. -M sets the size of the target eeprom and defaults to 8K. -I sets the output format as iic.