The Fusion GUI can read the data flash from the device, parse the content, package the content with particular PMBus command sets to meet the device requirement, and store it into a "script" file (.csv) that can be used by a microcontroller or other I 2C master to download data flash content to the device. The .csv file is a very good reference for those who want to implement their own I 2C download tool to download the configuration (.hex).
For more FAQ please check the following document.
UCD90xxx Family Frequently Asked Questions and Answers
UCD9090 UCD9090A UCD90120 UCD90120A UCD90124 UCD90124A UCD90160 UCD90160A UCD90240 UCD90320 UCD90320U