• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 82 subscribers
  • Views 123 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.

TMS320F28P550SJ: Is XRSn required to connected with VDDIO 3.3V?

Julia Li
Expert 4755 points

Part Number: TMS320F28P550SJ

Hi Champs,

 

Now customer's 3.3V design is according to our Launchpad. There is a external 3V3 and a VDDIO 3V3.

image.png

Many pin design requirements in the datasheet, such as XRSN, require pull-up resistors and connection to VDDIO. Now we want to know if it can be connected to 3.3V instead of VDDIO 3.3V. 

Could you help to check this? Thanks!

Best regards,

Julia

 

  • 0
    TI__Expert 4755 points

    Hi Champs,

    Is there any update?

    Thanks!

    Julia

  • 0 in reply to Julia Li
    TI__Mastermind 23721 points

    Hi Julia,

    VDDIO is the filtered 3.3V rail. This rail passes through some filter component which helps reduce noise and voltage spikes on the 3.3V input to the device. Especially for XRSn, it is highly recommended to use a filtered voltage rail as that will prevent spurious device resets caused by noise on the power rail. 

    Whether it is possible to ignore the recommendation is highly dependent on customer board design and what components are on the 3.3V power rail, and whether power is properly isolated

    Regards,

    Peter