How to Use W5500 w/ Level Shift: Examples, Pinouts, and Specs

The W5500 is a hardwired TCP/IP embedded Ethernet controller designed to simplify the process of connecting microcontrollers to the internet. It integrates a full TCP/IP stack, Ethernet MAC, and PHY, providing a reliable and efficient solution for network communication. The inclusion of level shift circuitry ensures compatibility between devices operating at different voltage levels, making it suitable for a wide range of microcontroller platforms.

• IoT (Internet of Things) devices
• Home automation systems
• Industrial control and monitoring
• Network-enabled embedded systems
• Data logging and remote monitoring

• Operating Voltage: 3.3V (logic level shifting supports 5V systems)
• Current Consumption: 132 mA (typical)
• Network Protocols Supported: TCP, UDP, ICMP, IPv4, ARP, IGMP, PPPoE
• Ethernet Speed: 10/100 Mbps
• SPI Interface: Up to 80 MHz
• Integrated Memory: 32 KB for TX/RX buffers
• Operating Temperature: -40°C to +85°C
• Package: LQFP-48

The W5500 module typically includes the following pins:

1. Power Supply: Connect the VCC pin to a 3.3V power source and GND to ground. If using a 5V microcontroller, ensure the level shift circuitry is properly configured.
2. SPI Interface: Connect the SPI pins (SCS, SCLK, MOSI, MISO) to the corresponding SPI pins on your microcontroller.
3. Reset and Interrupt: Connect the RST pin to a GPIO pin on your microcontroller for manual resets. The INT pin can be used to detect events such as received packets.
4. Ethernet Connection: Attach an Ethernet cable to the RJ45 connector on the module.
5. Pull-Up Resistors: Ensure pull-up resistors are used on the SPI lines if required by your microcontroller.

• Use decoupling capacitors (e.g., 0.1 µF) near the VCC pin to stabilize the power supply.
• Ensure the SPI clock frequency does not exceed 80 MHz.
• Use proper grounding techniques to minimize noise and interference.
• If using a 5V microcontroller, verify that the level shift circuitry is functioning correctly to avoid damaging the W5500.

Below is an example of how to use the W5500 with an Arduino UNO to establish a basic Ethernet connection:

#include <SPI.h>
#include <Ethernet.h>

// MAC address for the Ethernet shield
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

// IP address for the device
IPAddress ip(192, 168, 1, 177);

// Initialize the Ethernet server on port 80
EthernetServer server(80);

void setup() {
  // Start the serial communication for debugging
  Serial.begin(9600);

  // Initialize the Ethernet connection
  if (Ethernet.begin(mac) == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
    // Manually configure the IP address if DHCP fails
    Ethernet.begin(mac, ip);
  }

  // Start the server
  server.begin();
  Serial.print("Server is at ");
  Serial.println(Ethernet.localIP());
}

void loop() {
  // Listen for incoming clients
  EthernetClient client = server.available();
  if (client) {
    Serial.println("New client connected");
    // Wait until the client sends data
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        Serial.write(c); // Echo the received data to the serial monitor

        // Respond to the client
        server.write("HTTP/1.1 200 OK\r\n");
        server.write("Content-Type: text/html\r\n\r\n");
        server.write("<h1>Hello from W5500!</h1>");
        break;
      }
    }
    // Close the connection
    client.stop();
    Serial.println("Client disconnected");
  }
}

• Replace the mac and ip values with those appropriate for your network.
• Ensure the Ethernet library is installed in your Arduino IDE.

1. No Ethernet Connection:

   • Verify that the Ethernet cable is securely connected.
   • Check the LINK_LED and ACT_LED for activity.
   • Ensure the MAC and IP addresses are correctly configured.

2. SPI Communication Fails:

   • Confirm that the SPI pins are correctly connected.
   • Check the SPI clock frequency and ensure it does not exceed 80 MHz.
   • Verify that the SCS pin is properly toggled during communication.

3. Module Not Responding:

   • Ensure the RST pin is not held low.
   • Check the power supply voltage and ensure it is stable at 3.3V.
   • Inspect the level shift circuitry for proper operation.

4. Slow Network Performance:

   • Use shorter Ethernet cables to reduce signal degradation.
   • Check for excessive traffic on the network.

Q: Can the W5500 work with 5V microcontrollers?
A: Yes, the level shift circuitry allows the W5500 to interface with 5V microcontrollers safely.

Q: What is the maximum Ethernet speed supported?
A: The W5500 supports 10/100 Mbps Ethernet speeds.

Q: Do I need external memory for the W5500?
A: No, the W5500 has an integrated 32 KB memory for TX/RX buffers.

Q: Can I use the W5500 with platforms other than Arduino?
A: Yes, the W5500 can be used with any platform that supports SPI communication, such as Raspberry Pi, STM32, and ESP32.