UCD9222: No connection via PMBus

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Posted by Marcus Bednara

on Aug 03 2012 05:39 AM

Hi all,

we have a problem with UCD9222. We designed a DSP board with nearly identical
UCD9222/7242 architecture as on the EVM6678, and now we want to program
the UCD9222 via TI's USB adapter. This works fine on five of our boards, so I think
our circuitry should be ok.
On one board, however, the Fusion software fails to connect the UCD9222.
Maybe the UCD is damaged, but before replacing I want to ensure there is
no other bug.
So my question: what is minimally required to access the UCD registers via
PMBus? We have checked that V33DIO=V33A=3.3V available, AGND2=AGND3=DGND=0V,
/reset=1 and en1=en2=1. Are there more requirements to access the registers
via PMBus? Do you have any further suggestions where to start searching?

We have only a small number of prototype boards, so it would be fine to get
them all working.

Thanks in advance for your help.

Regards,
Marcus

All Replies

Posted by Marcus Bednara

on Aug 03 2012 08:15 AM

Intellectual350 points

Hi again,

problem is identified. We have a massive soldering defect of the UCD on this board.

The PMBus pins along with many others are not connected.

Regards

Marcus

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