• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 34 subscribers
  • Views 107 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.

PCA9306: PCA9306

Shane Kirkpatrick
Prodigy 10 points
Part Number: PCA9306
Other Parts Discussed in Thread: LSF0102

Tool/software:

A couple of questions relative to the IBIS model

 - The IBIS model uses the term "VCC" but the part uses VREF1 and VREF2 - Which does VCC relate to?

 - The IBIS model has 5 voltage "settings" for PCA9306_IO, which also uses the term VCC - Which does VCC relate to - VREF1 or VREF2?

 - The IBIS model has 5 voltage "settings" for PCA9306_IO_S, which also uses the term VCC - If I have 1.8V on VREF1 and 2.5V on VREF2, which VCC do I choose for my simulation?

I have BCCed a co-worker (Randy) on this thread so he might have some follow up quesitons, too.

Shane 

  • 0
    TI__Mastermind 47328 points

    Hi Shane,

    I believe the PCA9306 IBIS model is setup in the voltage translation mode when using the series switch model. VCC looks to be mapped to the EN pin of the device which would affect the gate voltage of each passFET connecting side 1 to side 2 of the device. See the LSF0102 structure which is very similar to PCA9306 internal structure. 

    By selecting PCA9306_IN_50A, this selects a VCC = 5V, which means that EN = 5V, and RDS_ON will be smaller, allowing more current to pass through the device. 

    PCA9306_IN_12A, would be worse case since VCC = 1.2V, EN = 1.2V, gate voltage is much less which means Ron will be higher reduce current through the device. 

    Shane Kirkpatrick said:
     - The IBIS model has 5 voltage "settings" for PCA9306_IO_S, which also uses the term VCC - If I have 1.8V on VREF1 and 2.5V on VREF2, which VCC do I choose for my simulation?

    For most accurate sim results, I would choose PCA9306_IN_25 in this case (2.5 volt VCC) model. 

    Regards,

    Tyler

  • 0 in reply to Tyler Townsend
    Prodigy 10 points

    Tyler

    Thank you for the quick response -  can you please provide more detail on the PCA9306_IO_S, setup. If my VREF1 is 1.8V and my VREF2 is 2.5V, which setting do I choose for PCA9306_IO_S,?

    Thanks

    Shane

  • 0 in reply to Shane Kirkpatrick
    TI__Mastermind 22400 points

    Hello Shane,

    We'll provide feedback by EOD. Thank you!

    Regards,

    Josh

  • 0 in reply to Shane Kirkpatrick
    TI__Mastermind 47328 points

    Hi Shane,

    VREF1 = 1.8V,

    VREF2 = 2.5V, 

    PCA9306_IN25

    This would be closest model match to your scenario. 

    Regards,

    Tyler