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UCD3138: UCD3138 full-bridge hard switch development board PMbus firmware

Part Number: UCD3138

Hello 
I recently learned the firmware of the UCD3138 full-bridge hard switch development board
I see a lot of code for PMbus in the firmware, such as pmbus_command.h, pmbus_constants.h, pmbus_topology.c, pmbus_topology.h, scale.c.

I didn't understand PMBus communication before.
Is there any application report to introduce these program designs, and what other information about PMbus needs to be learned?
Thank you