• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 99 subscribers
  • Views 715 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

AM3352: Vpp pin connection

DJ-NG
Genius 9355 points
Part Number: AM3352


Hi,

customer need to know, how to handle VPP pin M5 in ZCZ package (open, GND or dedicated voltage rail) ?

  • 0
    Mastermind 8040 points

    VPP is used for eFuse programming and should be open, at least for GP parts. (To quote the am335x datasheet, "During functional operation, this pin is a no connect.")

  • 0
    TI__Guru**** 170625 points
    Hi DJ-NG,

    Matthijs comment is correct. Please refer also to the below e2e threads for more details:

    e2e.ti.com/.../273822
    e2e.ti.com/.../265417
    e2e.ti.com/.../224333

    Regards,
    Pavel
  • 0 in reply to Pavel Botev
    TI__Genius 9355 points
    Pavel,

    thanks for that.
    Customer stated, that in older designs they connected VPP with 1.8V domain and wonder,
    if this might cause problems and they need to change design.
    Until today they did not have any problems with that.
    Can you pls give a statement ?
  • 0 in reply to DJ-NG
    TI__Guru**** 170625 points

    DJ-NG said:
    Customer stated, that in older designs they connected VPP with 1.8V domain and wonder,
    if this might cause problems and they need to change design.
    Until today they did not have any problems with that.
    Can you pls give a statement ?

    This mode of operation has not been evaluated since it is not recommended. You can use it only on your own risk.

    I can't say what the impact of this error can be, as this isn't documented anywhere. However this is the voltage supply for programming the processor e-fuses, so results can be unpredictable.

    The issue with connecting VPP to VDD is that there is a possibility of some current path between the supplies based on how this is shorted and during power up/down.

    This issue may cause FUSE ROM damage or data corruption.

    Regards,
    Pavel