TPLD1202: Open drain operation

Part Number: TPLD1202

Tool/software:

Hey, 

I am encountering an problem with open drain output. In particular I would like to have 2x NMOS open drain setting with 10kR pull up on the IO4. 
What ever I do the open drain output doesn't work, however push pull 1x or 2x works normally on the same pin. 
Open drain settings (not working):
Open drain settingsOpen drain settings OSCI
Push pull setting (working):
Push pull settingsPush pull settings OSCI

I must be doing something wrong, any ideas as to how to make open drain output to work? It seems open drain doesn't work on any of the pins I tested. I tested with 1x2x or 4x none of the settings work, I tried inverting the signal and also with different pull up values (not that any of those settings should have impact on the operation)

Thanks in advance. 

  • Hi,

    Jan let me work with one of my coworkers to see if this is a bug or not. I will get back to you with a response.

  • Hi Jan,

    It doesn't seem like you are doing anything wrong. 

    We tested this and observed the same results in the 2X Open-drain.

    1X open-drain always pulls down, and then 4X open-drain actually works correctly.

    Not entirely sure what is happening, we will try to dig deeper into this 

  • I have also tested IO1 and IO2 with 4X open drain, but I need those pins for I2C. If you find a solution with IO4 open drain please let me know.