TMS320C6678: After power on, the CVDD is 1.13V, is it correct?

Gary Lu

Part Number: TMS320C6678
Other Parts Discussed in Thread: UCD9222

Hello，

Question 1: We have referenced EVM6678L to sample a new circuit board and downloaded the XML configuration of UCD9222 provided by EVM
After going to PMBus, I found that the CVDD is 1.13V and no software is running, which seems to be different from the configured 0.9V. Is it correct or does it need to be adjusted?

Question 2: Is there an update to the configuration or firmware of UCD9222 for C6678? Because TMDXEVM6678L_ UCD9222_ 16May11_ Ver5.xml cannot be used on the new Fusion Design Online, thank you!

Regards，

Gary

over 2 years ago

0 kcastille over 2 years ago

TI__Guru 54352 points

Gary,

Where does 0.9V come from? The SoC datasheet says the boot voltage should be either 1.1V or 1.15V depending on speed grade:

Regards,

Kyle

0 Gary Lu over 2 years ago in reply to kcastille

TI__Intellectual 1660 points

Hello，

May I ask if C6678 will adjust CVDD on its own after startup? Do you still need intervention?

Regards，

Gary

0 kcastille over 2 years ago in reply to Gary Lu

TI__Guru 54352 points

Gary,

Software is responsible for reading the AVS value that is unique per die, and programming the external supply accordingly. I.e., software must set AVS.

Regards,

Kyle

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TMS320C6678: After power on, the CVDD is 1.13V, is it correct?