W5500 circuit - are these resistors needed?

Question

I am working on integrating the W5500 on a circuit. I am using this schematic (w external transformer) [url]http://wizwiki.net/wiki/lib/exe/fetch.php?cache=&media=products:w5500:w5500_sch_v110_use_trans_.png[/url] I am wondering why we need resistors: R13, R14, R15, and R18, R19, R20. They are connected to NC pins. Can these be left out?

Edward · Answer

Hi. We provide to minimum schematic for operation. R13, 14, 15, 18, 19, 20 is not using. It is fine. It is not left out Thank you

pekasus · Answer

So I don’t need them in my circuit, correct?

Eugeny · Answer

This reference circuit diagram you used is for separate transformer and RJ-45 jack. Pins 4, 5, 7 and 8 may be used for either additional data transmission or PoE (power over ethernet). You will NOT need these pins if you do not use any of these features. And you will not need those related resistor (for termination) if your network does not use these capabilities. BUT - if you are unsure, leave soldering places for these components on the board when designing it. Again - if you are going to use separate transformer and jack. Refer here: [url]http://wizwiki.net/wiki/lib/exe/fetch.php?cache=&media=products:w5500:w5500_sch_v110_use_mag_.png[/url]