TMS570LC4357: TMS570LC4357: how to treat pin "V19" and "W18" for AD2IN[24]

Hi Matusan,

The PCB trace should be routed to both of these balls.

The reason for this duplication is that the very corner balls on the BGA are the most likely to become open due to stresses.
For this reason normally we only put GND on the corner three balls.

But in this case there is a signal there. So we used two adjacent balls that way if one does open the other is there to keep the
connection to the PCB active. I hope that makes sense.

In a nutshell: The duplication is there for redundant connections as these particular physical balls are most likely to 'open' due to stress.

-Anthony

Hi Anthony,
 
Thank you for your detailed explanation.
We really appreciate your help.
We understand the reason of the duplication.
 
Our understanding is as follows;
  - AD2IN[24] is connected to both "V19" and "W18" in the BGA package.
( You used the word "duplication".)
  - Both "V19" and "W18" should be connected to PCB.
(You said "The PCB trace should be routed to both of these balls".)
Is this understanding correct?
 
Best regards,

Yes exactly.