Power Pins

• VIN - This is the power pin. To power the board, connect to the same power as the logic level of your microcontroller, e.g. for a 3V micro like a Feather, use 3V, and for a 5V micro like an Arduino, use 5V.
• 3.3V - this is the 3.3V output from the voltage regulator, you can grab up to 100mA from this if you like.
• GND - This is common ground for power and logic.

Ethernet Port

The Ethernet port is where you'll plug in an Ethernet cable. The port has two status LEDs:

• Yellow LED - The yellow LED is located on the left side of the port. It indicates the speed of the connection.
• Green LED - The green LED is located on the right side of the port. It indicates network connectivity.

If either of these LEDs are off, it means there is an issue with your Ethernet network connection.

SPI Pins

• SCK - This is the SPI clock input pin.
• MISO - This is the SPI MISO (Microcontroller In / Serial Out) pin.
• MOSI - This is the SPI MOSI (Microcontroller Out / Serial In) pin.
• CS - This is the SPI chip select pin.
• RST - This is the reset pin for the breakout. To reset the board, this pin should be held low at least 500 us.

Interrupt Pin

• IRQ - This is the interrupt pin for the breakout. It's default state is active low. 

Mode Jumpers

On the back of the board are three jumpers labeled M2, M1 and M0 on the board silk. A combination of these jumpers being open and closed set the mode for the WIZ5500. By default, all of the jumpers are open (low) to be in mode "10BT Half-duplex, Auto-negotiation disabled". The table below shows which combination of jumpers should be left open (unsoldered, low) and closed (soldered, high) to set different modes. Another version of this table is available in the WIZ5500 datasheet on page 10.