Looking at the schematics at: wizwiki.net/wiki/doku.php?id=pro … fschematic
there are many unique component values.
My application uses an RJ45 with integrated transformer and separate CT signals for RX and TX.
Let’s start with the two 6.8nF series capacitors. The headline “RJ45 with integrated Transformer and connected CT” states the reason for adding the series 6.8nF capacitors. They are needed to DC isolate the RX pins from the common TX/RX CT which will have a DC voltage of about 3.3V (through the 10 Ohm resistor).
However, by looking at the schematic “W5500 Ref.Schematic - RJ45 with Transformer” the 6.8nF capacitors are still included. The RJ45 in this schematic has separate RX and TX CT signals - i.e. they are NOT ONE common. My question then is: Why are those 6.8nF capacitors included here?
If there is another good reason for having them (explain why please), will 10nF do the job (i.e. can I replace 6.8nF to 10nF)? This would be beneficial since 10nF is used extensively elsewhere in the schematic.
Another ambiguous capacitor value is the 22nF to GND from TCT. This same capacitor is replaced with a 100nF when CT are common.
Will a 100nF capacitor still be usable for this capacitor when using separate CT? Again, this would be beneficial in order to reduce the unique component part values.
There is also the TOCAP 4.7uF capacitor. Since 10uF us used extensively elsewhere. Will a 10uF work instead of the 4.7uF part?