• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 32 subscribers
  • Views 755 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.

Resistor partition network with 5V tolerant GPIO

Alberto Soattin
Genius 16905 points

Hi Support,

can you kindly confirm me if the following partition resistor network can work with both 3,3VDC as well as with 5V tolerant GPIO?

Thanks and regards,

Alberto

  • 0
    TI__Guru**** 244400 points
    Hello Alberto

    Yes, it can work for 5V tolerant IOs. What is the resistor partition for?
  • 0
    Guru 27665 points

    A few concerns

    • No overvoltage protection
    • No undervoltage protection
    • No filtering
    • No current limit for the micro's ESD diodes
    • Is ~0.1mA enough of a wetting current?

    Robert

  • 0 in reply to Robert Adsett
    Guru 47900 points

    And - should that (bottom) resistor NOT be tied firmly to ground - or be too (high) in value - disaster looms.  (220K is but ONE (close-color) band away!)

    Poster Robert has (again) "nailed it" w/his listing.

    Imposing any capacitance (to enable a filter) with those (way) high resistance values - will "slew" your waveforms. (slowing the frequency response - although at 24V signal levels - high speed may not be "in play.")