W5500 PCB layout
Ethernet Chips
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Ethernet Chips
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RE: W5500 PCB layout
by Alan WIZnet ·
Hi , I’m Alan
If you have any additional questions, please ask.
RE: RE: W5500 PCB layout
by Vien Huy Nguyen ·
Thank you Alan, I have a few more questions:
I noticed the receiving pair is terminated with two 150R resistors R16, R17. I believe they are not Bob Smith termination resistors. What are the functions of these resistors? Are they optional?
On the W5500 side, why the transmitting pair is terminated to 3.3V and receiving pair to GND? And why the center tap of the transmitting pair is connected to 3.3V?
Are C9 and C10 there to form RC filters with the termination resistors?
RE: W5500 PCB layout
by Alan WIZnet ·
Yes, hello.
I’m answering.
I think it will depend on the trans and RJ45 choices. As you said, it’s not a Bob-Smith circuit. Termination resistance, which is used to reduce noise in the RX. Noise is reduced when a resistor is fitted, but the signal may become a little lumpy. You will need to consider and design it for each circuit. It is not an essential element, as it does not depend on a typical circuit.
The W5500 has no internal bias voltage at the transmitting end and an internal bias voltage at the receiving end. Therefore, the transmitter must apply bias voltage to an external circuit. If you search for Ethernet Voltage Mode and Current Mode, there is a lot of information.
Yes. It also acts as an RC Filter. Filter. The primary function is EMC.
RE: RE: W5500 PCB layout
by Vien Huy Nguyen ·
Thanks Alan.
Another question: what is the power consumption of the termination resistor R1, R2, R6, R7? R1 is connected to 3.3V, so the power will be 3.3*3.3/49.9 = 0.218W.
However, on the evaluation board, 0402 resistors are used, which can only dissipate 0.031W.
RE: W5500 PCB layout
by Alan WIZnet ·
You don’t have to worry about that.
The communication line is not directly connected to the GND via a resistor. Because it is connected to the IC side, the current is used only as much as necessary.
RE: W5500 PCB layout
by Shamlik Hakeem ·
Hi Alan, i don’t know if you would see this , but if u did please reply , so i was designing pcb , which has ethernet and I’m using the W5500 IC , so about the damping resistors and the stubs how should i place them ? i saw many references and I’m kinda puzzled right now! is there a specific method on how to place this resistors and capacitors
RE: W5500 PCB layout
by Alan WIZnet ·
Hello.
Download the Design Guide from the link below!
If you’re not sure, please send me an e-mail.
Alan@wiznet.io