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AM3358: are ZCZ ZCE wafers identical?

Andrew Marsh
Intellectual 765 points
Part Number: AM3358

We have a known good design that uses the OSD3358-SM (System in package built around the AM3358). We recently built some boards that used a variant of the OSD3358-SM with more RAM and are now seeing complete failure of the VDDSHV2 voltage domain. I know you can't provide direct support as this is an Octavo Systems part, but I have a question I think is in scope.

Are the dies physically different between the AM3358 ZCZ and ZCE devices or are the differences solely a result of packaging? Per the datasheet VDDSHV2 is VDDSHV1 on ZCE devices which would definitely cause problems for us. The EFUSE_SMA register is not programmed on the Octavo parts.

  • 0
    TI__Expert 4440 points

    To the best of my knowledge, the dies on the two devices should be identical. The difference should only be in the ball pitch and pinout. The datasheet does seem to indicate that VDDSHV2 on ZCZ is the same as VDDSHV1 on ZCE. Note that VDDSHV3 on ZCZ could also be the same as VDDSHV1 on ZCE. 

    I will reassign this for confirmation and providing any further insight.

    regards,

    -Shriram

  • 0
    TI__Mastermind 28015 points

    I can confirm what Shriram has stated, the die is the same for the ZCE and ZCZ packages for devices of the same silicon revision.  

    With the reduction of available pins on the ZCE package, some voltage rails were combined.  This does not impact the operation of the device, but simply reduces the granularity of possible IO voltage assignments.  As long as the ZCZ VDDSHV1 and VDDSHV2 voltage domains  are the same, then the combining of them on the ZCE will not be an issue as long as the IO signals on the ZCE VDDSVH1 domain are at the correct potential!

    The EFUSE_SMA  register will not impact the operation of the Octavo parts.

     --Paul