• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 81 subscribers
  • Views 234 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

F28379D Delfino Experimenter Kit

Dany Bourget
Intellectual 350 points

I have a question regarding the schematic of the F28379D Delfino Experimenter Kit. I.m wondering why the pullup and the pulldown resistors are so different for the boot mode selection. (56K pullup vs 2K2 pull down).

  • 0
    TI__Guru 57255 points

    Hi Dany,

    It is an artifact of the way that the switches control the boot mode.  Notice that a SPST switch was used. 

    If the switch is open, the pin will get pulled high with a 56K pull-up. 
    If the switch is closed, the pin will get pulled low - the 2K2 pulldown will overpower the 56K pullup. 

    If the controlCARD used a SPDT switch or jumpers to choose between the boot modes, the pull resistors could be the same.  I'd probably use 10K-47K resistors in this case.

    Hopefully this helps!


    Thank you,
    Brett