• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 2 answers
  • Subscribers 34 subscribers
  • Views 180 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.

PCF8575: PCF8575 failure mode

yuta kishimoto
Prodigy 10 points

Part Number: PCF8575

What are the possible failure modes of the PCF8575DW?
(Thermal stress, ESD, etc.)

Before using this IC, I'd like to know what precautions I should take and what actions could cause it to break.

  • 0
    TI__Guru 60418 points

    Hi Yuta,

    Any electrical spec of the device outside absolute maximum conditions may cause this device to fail. 

    For example, drawing too much current through the supply pin which means too much current being driven through the IO pins. 

    Another common point of failure would be driving too much current through a single IO pin configured to output. The IO pins do not have a smart current limit. If you accidentally drive a short, or a resistive load that is too strong, several mA can be sink/sourced through an output pin causing damage to the output pins driver. 

    These I would say are the most common fail modes for this device. 

    Regards,

    Tyler

  • 0 in reply to Tyler Townsend
    Prodigy 10 points

    Hi Tyler.
    Thank you for your support.

    If this "the most common fail modes" occurs,
    how is it likely that this IC will behave?

    This may be a difficult question full of assumptions, but I would appreciate any help.

    Best regards.

  • 0 in reply to yuta kishimoto
    TI__Guru 60418 points

    Hi Yuta,

    If you sink or source too much current out of the IO pin you are subject to permanent damage of the device. This results in the IO pin not working i.e. not being able to drive an output high or low, and affecting over ICC current consumption due to leakage. 

    Regards,

    Tyler

  • 0 in reply to Tyler Townsend
    Prodigy 10 points

    Hi Tyler.
    Thank you for your reply.

    I now understand the failure modes and what happens when they occur.

    Thank you for your assistance.