W5100 Ethernet Design Guide
Description:
This document is a WIZnet Ethernet Chip design reference. It
contains PCB design references using W5100, W5300, W5500, W7500,
and W7500P. The references include information about the Medium
Dependent Interface (MDI), power supply, parts placement, and Media
Independent Interface (MII). It is important to follow the
instructions provided in this document to ensure optimal Ethernet
performance.
SCH Design Guide – W5100, W5100S, W5300, W6100:
The circuit configuration may vary depending on the internal
circuit of the Ethernet socket. Therefore, it is crucial to refer
to the respective datasheets and design the circuit accordingly. If
you are using an Ethernet socket without a transformer, you need to
design the transformer part of the circuit as well.
The TCT of the transformer, the GND connected to the RCT, and
the GND connected to the longitudinal resistance of the TX and RX
can be designed as AGND instead of the normal GND. This design
choice helps separate the MDI signal from system GND noise. In such
cases, it is important to ensure that the AGND area is sufficiently
large. Alternatively, integrating AGND and system GND can be more
advantageous.
Option1 refers to a damping resistance against electromagnetic
compatibility (EMC). This resistance helps prevent common mode
noise and differential mode noise interference. It is important to
choose an appropriate resistance value because if it is too large,
it may cause a decrease in the voltage level of the differential
line, leading to Ethernet communication problems.
SCH Design Guide – W5500:
The circuit configuration may vary depending on the internal
circuit of the Ethernet socket. Therefore, it is crucial to refer
to the respective datasheets and design the circuit accordingly. If
you are using an Ethernet socket without a transformer, you need to
design the transformer part of the circuit as well.
The TCT of the transformer, the GND connected to the RCT, and
the GND connected to the longitudinal resistance of the TX and RX
can be designed as AGND instead of the normal GND. This design
choice helps separate the MDI signal from system GND noise. In such
cases, it is important to ensure that the AGND area is sufficiently
large. Alternatively, integrating AGND and system GND can be more
advantageous.
Option1 refers to a damping resistance against electromagnetic
compatibility (EMC). This resistance helps prevent common mode
noise and differential mode noise interference. It is important to
choose an appropriate resistance value because if it is too large,
it may cause a decrease in the voltage level of the differential
line, leading to Ethernet communication problems.
SCH Design Guide – W7500, W7500P:
The circuit configuration may vary depending on the internal
circuit of the Ethernet socket. Therefore, it is crucial to refer
to the respective datasheets and design the circuit accordingly. If
you are using an Ethernet socket without a transformer, you need to
design the transformer part of the circuit as well.
The TCT of the transformer, the GND connected to the RCT, and
the GND connected to the longitudinal resistance of the TX and RX
can be designed as AGND instead of the normal GND. This design
choice helps separate the MDI signal from system GND noise. In such
cases, it is important to ensure that the AGND area is sufficiently
large. Alternatively, integrating AGND and system GND can be more
advantageous.
Option1 refers to a damping resistance against electromagnetic
compatibility (EMC). This resistance helps prevent common mode
noise and differential mode noise interference.
Product Usage Instructions:
To use the WIZnet Ethernet Chip, follow the steps below:
- Refer to the respective datasheet for your specific chip model
(W5100, W5300, W5500, W7500, or W7500P) to understand the internal
circuit configuration. - Design the circuit according to the information provided in the
datasheet. Pay attention to the Medium Dependent Interface (MDI),
power supply, parts placement, and Media Independent Interface
(MII). - If you are using an Ethernet socket without a transformer,
ensure that you design the transformer part of the circuit as
well. - Consider designing the TCT of the transformer, the GND
connected to the RCT, and the GND connected to the longitudinal
resistance of the TX and RX as AGND instead of the normal GND. This
helps in separating the MDI signal from system GND noise. Ensure
that the AGND area is large enough or integrate AGND and system GND
if more advantageous. - Choose an appropriate value for Option1, the damping resistance
against electromagnetic compatibility (EMC). This resistance should
prevent common mode noise and differential mode noise interference.
Avoid using a resistance value that is too large as it may cause a
decrease in voltage level and Ethernet communication problems.
By following these instructions, you can ensure optimal
performance and functionality of the WIZnet Ethernet Chip.
Description
This document is a WIZnet Ethernet Chip design reference. It contains PCB design references using W5100, W5300, W5500, W7500, and W7500P. Includes Medium dependent interface (MDI), power supply, parts placement, Media Independent Interface (MII), etc. You must follow the instructions below. Failure to follow the instructions may result in poor Ethernet performance.
Contents SCH Design Guide W6100, W5100S, W5300 W5500 W7500, W7500P Using RJ-45 without Transformer PCB Design Guide Ethernet Socket MDI TEST Compliance EMI RE PoE
SCH Design Guide
W5100, W5100S, W5300, W6100
The circuit may change depending on the internal circuit configuration of the Ethernet socket. Make sure to refer to Datasheet and design the circuit in an appropriate way.
If you use an Ethernet socket that does not include a transformer, you must also design the transformer part of the circuit.
The TCT of the transformer, the GND connected to the RCT, and the GND connected to the longitudinal resistance of the TX and RX can be designed as AGND instead of the normal GND. This is for the separation of the MDI signal from the system GND noise, in which case the area of the AGND should be large enough. Otherwise, it is more advantageous to integrate AGND and system GND.
Option1 is a damping resistance against EMC. Resistance to prevent common mode noise and differential mode noise interference; if the resistance value is designed too large, the voltage level of the differential line may decrease, which may cause Ethernet communication problems.
SCH Design Guide
W5500
The circuit may change depending on the internal circuit configuration of the Ethernet socket. Make sure to refer to Datasheet and design the circuit in an appropriate way.
If you use an Ethernet socket that does not include a transformer, you must also design the transformer part of the circuit.
The TCT of the transformer, the GND connected to the RCT, and the GND connected to the longitudinal resistance of the TX and RX can be designed as AGND instead of the normal GND. This is for the separation of the MDI signal from the system GND noise, in which case the area of the AGND should be large enough. Otherwise, it is more advantageous to integrate AGND and system GND.
Option1 is a damping resistance against EMC. Resistance to prevent common mode noise and differential mode noise interference; if the resistance value is designed too large, the voltage level of the differential line may decrease, which may cause Ethernet communication problems.
SCH Design Guide
W7500, W7500P
The circuit may change depending on the internal circuit configuration of the Ethernet socket.
Make sure to refer to Datasheet and design the circuit in an appropriate way.
If you use an Ethernet socket that does not include a transformer, you must also design the
transformer part of the circuit.
The TCT of the transformer, the GND connected to the RCT, and the GND connected to the
longitudinal resistance of the TX and RX can be designed as AGND instead of the normal GND. This is for the separation of the MDI signal from the system GND noise, in which case the area of the AGND should be large enough. Otherwise, it is more advantageous to integrate AGND and system GND.
Option1 is a damping resistance against EMC. Resistance to prevent common mode noise and
differential mode noise interference; if the resistance value is designed too large, the voltage level of the differential line may decrease, which may cause Ethernet communication problems.
The Current Mode PHY has a termination resistor circuit inside, eliminating the need to design
an external termination resistor.
Since the W7500 does not have PHY, additional PHY circuits must be designed.
SCH Design Guide
Using RJ-45 without Transformer
If you use an Ethernet socket without Transformer, you must design an additional Transformer circuit.
The above circuit is a typical circuit configuration and corresponds to W5100, W5100S, W5300, and W6100 on the WIZnet Ethernet Chip.
Based on Transformer, PHY to Transformer is the System GND area. It is recommended that the termination resistance be placed closest to the end of the
signal. (Receiving side)
PCB Design Guide
Decoupling Capacitor
The Decoupling Capacitor is used to remove noise from the power line. As filtering is the purpose, it is recommended to place it as close as possible to the chip. It is recommended that at least one Capacitor be designed for each power line.
PCB Design Guide
Oscillator
Because it is a high-frequency signal, it is recommended to design without Via in layers such as Chip during Artwork.
It is recommended that only one chip be connected to one oscillating element. (current problem, interference
PCB Design Guide
GND Plane
It is also recommended to put GND Copper powder on the inside of the chip. It is recommended that no other digital lines pass across the chip. It is recommended that you place multiple Via’s to maintain good GND connectivity. It is recommended to distinguish between AGND and DGND. If you separate AGND and DGND, it is not functionally good if it is located on the same
coordinate even if it is a different layer.
PCB Design Guide
Power Pattern
The Power Plane should also consider Pattern and Via. The current capacity of the pattern depends on the width, thickness, OZ, and temperature.
If possible, it is better to design with several smaller Via rather than one larger Via. (Current capacity is greater)
PCB Design Guide
Ethernet Socket
If you use an RJ-45 socket without Transformer, you must design the Transformer circuit additionally.
The above circuit is a typical circuit configuration and corresponds to W5100S, W6100, and W5300 on the WIZnet Ethernet Chip.
Based on Transformer, PHY to Transformer is the System GND area.
PCB Design Guide
MDI
The distance between RJ-45 and Chip should be as close as possible. Because the Tx, Rx signals are differential signals, each line must be of the same length. If the
lines are formed differently, the differential mode signal can switch to common mode noise, affecting EMI, and causing Ethernet communication to become a problem.
It is recommended that a GND pattern be placed between TX and RX so that there is no influence between the two lines.
If the distance between the two lines is wide enough not to affect each other, there is no need for GND Copper.
The Impedance of the Line depends on the GND processing. When designing this part, Impedance Matching is possible with line thickness and Clearance.
It is not good for other Digital Lines to pass through the TX and RX lines. It is not good to have a high frequency device around (OCS, etc.)
Minimum condition for Ethernet Impedance Line design. The impedance of Ethernet is 100 ohms. In order to design an accurate Impedance 100 ohm, you should ask the PCB
manufacturer to design it. (Impedance changes depending on Solder Mask, Oz, and process method.)
TEST Compliance
Test conducted at 10/100M Power – USB Micro B Type
TEST EMI – RE
Source Power 5 Volt Adapter Power Test running with maximum Dummy Data transmission and reception
