• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 12 subscribers
  • Views 428 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.

ISO1640: ISO1640BDR max ratings

Kalhana Colombage
Prodigy 65 points
Part Number: ISO1640
Other Parts Discussed in Thread: ISO1540,

Hi,

In the ISO1640BDR data sheet's absolute maximum table, it mentions that the SDA and SCL lines for either side should not exceed VCCX + 0.5V

So does that mean that the part may get damaged if the VDD is not powered and I2C activity is present on the same side?

  • 0
    TI__Genius 17100 points

    Hi Kalhana,

    Thank you for posting to E2E!

    Damage is not expected to ISO1540/ISO1640 devices when I2C activity is present on the SDAx and SCLx pins and a power supply is not present on Vccx pins. Through the pull-up resistor connection to the local Vccx supply, I2C does not drive data pins HIGH: it either pulls them low or fully releases them.

    This is especially important for hot-swap compliance in ISO164x devices. If the SDAx and SCLx lines are strongly driven HIGH, instead of connected to pull-up resistors, damage could occur in the absence of a power supply.


    Please let us know if you have additional questions.


    Thank you,
    Manuel Chavez