WIZ-IP55 User Manual Table 2-1 Pin Description Pin numberPin nameFunctionP1 ACT_LED Data reception/transmission activity indicator light P2 VCC 3.3V power supply pin P3 GND Power ground SPI interface chip selects signal pin, with low level as the P4 CSn effective state P5 CLK SPI clock input pin P6 MISO SPI master input, slave output P8 MOSI SPI master output from slave input P9 INTn Interrupt output pin, low level is effective Reset pin, low level effective (must be maintained for at P10 RESETn least 500us) P11 NC Retention function P12 NC Retention function P13 LINK_LED Network connection indicator light L1 LED1- Connect to P1 L2 LED1+ Connected in series with the resistor to VCC L3 LED2+ Connected in series with the resistor to VCC L4 LED2- Connect to P13 S1 SHILD1 Shell S2 SHILD2 Shell WIZ-IP55 User Manual7 / 10