copilot

• A single-chip solution that embeds TCP/IP stack, 10/100 Ethernet MAC and PHY. This enables users to implement an Ethernet application by adding just the simple socket program.
• Capability to support TCP, UDP, IPv4, ICMP, ARP, IGMP, and PPPoE protocols.
• Support for high-speed SPI (Serial Peripheral Interface) for easy integration with the external microcontroller.
• Internal 32KB memory buffer for processing Ethernet packets.
• Capacity to support 8 independent hardware sockets simultaneously.
• Provision of Wake on LAN (WOL) and power down mode options which are useful for reducing power consumption.
• Built-in PHY embedded for 10BaseT/100BaseTX.

copilot

1. ESD Protection Devices: These can be placed at the Ethernet connector inputs (RJ-45). TVS diodes are often used for this purpose. They are designed to protect the circuit by clamping the voltage when the ESD occurs.
2. Grounding: In your project, make sure that all the ground points (identified as Exclude from BOM: true) are properly connected with minimal impedance, especially the AGND pins on IC (like U1:(AGND)). Capacitors on power supply pins (U1:(AVDD) and U1:(VDD)) should be placed as close as possible to the IC pins, with the ground side going directly to a large ground plane.
3. Decoupling Capacitors: Use decoupling capacitors close to the power supply pins of the W5500. Already in your project, capacitors like C19, C22, C14 etc. are connected across power supply lines for this purpose.
4. Appropriate Layout: Always try to keep all Ethernet-related traces as short as possible to limit antenna-effect picking up environment ESD. Also, ensure that the PCB traces have the proper impedance matching.
5. Isolated Power Supply: Use of isolated DC-DC converter for providing power to the Ethernet PHYs could be beneficial in keeping noise due to ESD out of your system power rails.
6. Isolate IC from Human Interactions: Try to isolate the W5500 IC from interfaces accessible to humans, like Buttons, LEDs etc. These are common points where ESD could get in.

copilot

1. ESD Protection Devices: Consider using external ESD protection devices such as TVS diodes. They can shunt the high voltage transients produced by an ESD event away from sensitive circuit elements. Connect them as close as possible to the connector leading to sensitive devices like Ethernet chips.
2. Grounding: Ensure a clear and efficient grounding system. A well-designed system provides a path for the ESD dissipation.
3. Correct Handling Procedures: Always handle components with care at all stages to avoid any unnecessary ESD. Operators should be grounded using ESD wrist straps when handling these devices.
4. ESD Safe Workspace: Work in an ESD-protected area and use ESD-safe storage for sensitive components.
5. PCB Layout: In the PCB Layout, it can be helpful to have some ESD protection too. This could include things like ground guard rings and placement of components and traces in the layout to minimize exposure to potential ESD sources.

markscheider

copilot

1. ESD protection components: Use Electrostatic Discharge (ESD) protection components such as ESD suppression diodes or Transient Voltage Suppression (TVS) diodes. They can be placed close to the input/output lines that are exposed to ESD strikes.
2. Use of Filters: You can use Ferrite Beads or EMI filters on power supply lines to suppress unwanted interference, which might be causing a reboot.
3. Power Supply Decoupling: Ensure good Power Supply decoupling near the chip. Consider having 100nF capacitors (like C14, C15, C16) placed as closely as possible to the power pins of the W5500 (U1) to filter out high-frequency noise on the power supply line. For larger transients, use bulk capacitors like C21, which has a value of 100uF.
4. Optimizing PCB Layout: Keep the trace lengths of I/O lines and power lines as short as possible, and use proper grounding. Try to route sensitive signals and power traces away from potentially noisy ones.
5. Handling and Environment: Be sure to follow ESD-safe handling procedures when working with the assembly. Use of ESD-protective work surface or mat, ESD-safe tools, protective packaging, and grounding are all essential when working with sensitive electronic components.

copilot

• Debugging/Testing: The resistor allows measuring the current or voltage across the pins without altering the circuit significantly.
• Reconfigurability: If future design changes require connecting the RSVD pin to a different voltage level, the resistor allows for easier adjustments.
• Safety Margin: The resistor offers protection against accidental short circuits or current surges, which might affect the pin or the rest of the circuit.