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TPS53685 and TPS536C5 supports two methods to set PMBus address.
When using PD method, first we have to know the "PD_PMBUS_ADDRESS". PD PMBUS_ADDRESS is the initial base setting of the PMBus address when appling PD method.
The default PD_PMBus_ADDRESS :
TPS53685: 3Fh
TPS536C5: 5Fh
The RADDR will provide the offset.
PMBUS_ADDRESS = PD_PMBUS_ADDRESS + offset
Place RADDR >15k Ohms will be consider as an OPEN, and you can directly change the PDBUS_ADDRESS inside the config file.
Example: Using TPS536C5, PMBus address is 60h