• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 488 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.

TCAN1044-Q1: the function of the output capacitor to GND

Hale Tan
Expert 3770 points
Part Number: TCAN1044-Q1
Other Parts Discussed in Thread: TIDM-02014

Hi team,

What's the function of the CAN output capacitor to GND? I find that we didn't give the specific parameter in the datasheet. And in some reference design, I find that there are even not output capacitor, such as TIDM-02014. Is it essential to add this capacitor? What's the risk without this capacitor? And what is the value of the capacitor?

  • 0
    TI__Prodigy 440 points

    Hi Hale,

    To clarify, are you referring to the 4700pf capacitor on the data bus?  This capacitor is part of the split termination, so instead of using a single 120 Ohm resistor, this example has two 60 Ohm resistors with the shunt capacitor between them, usually between 1-100nf.

    This is a termination method that also helps filter out AC noise, but it's worth mentioning that both of the 60-ohm resistors need to be well matched for it to function properly. If the extra AC filtering isn't a concern, you could replace the capacitor and both resistors with a single 120 Ohm resistor instead.

    Hope this helps!

    Zach