• State
  • Locked Locked
  • Replies 5 replies
  • Subscribers 34 subscribers
  • Views 1471 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.

TCA6424A: Delay

Barg
Prodigy 40 points
Part Number: TCA6424A
Other Parts Discussed in Thread: TCA6424

What is the delay added by TCA6424A IO Expander Evaluation board ?

  • 0
    TI__Mastermind 23156 points
    Hello Bhargavi,
    Are you asking how much delay is added by the EVM due to onboard MCU? Can you expand on what specific delay you are talking about?
    -Francis Houde
  • 0 in reply to fhoude
    Prodigy 40 points
    Yeah. As IO expander is intermediate additional component , does it add any delay? If yes, what is the propagation delay or path delay of data through IO expander EVM?
  • 0 in reply to Barg
    TI__Mastermind 23156 points
    Hello Barg,
    I don't have specifics about how long it takes to toggle the IO on the GUI to actually toggling the TCA6424A's IO. There are a lot of variables. PC delay, and Launchpad delay can vary. With respect to the TCA6424, the time it takes initiate an I2C command and have it change an IO is 400nS after a stop condition.
    -Francis Houde

    I am not sure why you are asking this question. What are you trying to do?
    -Francis Houde
  • 0 in reply to fhoude
    Prodigy 40 points

    I want to know about delay because I am using keypad before IO expander, so how long this IO expander will take to reflect the key pressed ? Is it less than 30ms??

  • 0 in reply to Barg
    TI__Mastermind 23156 points
    Hello Barg,
    Do you have the EVM? If so, then what I would do is measure the time it takes to click the GUI icon using the mouse's mechanical switch and see how long it takes to toggle the IO on the TCA6424. I would use that number and add some extra time to have some buffer.
    -Francis Houde