W5500 Ethernet with POE IoT Board (Arduino Compatible) _ws20 Extra 40-pin header of the

Extra 40-pin header of the R-Pi in order to support existing expansion boards

SPI enabled chip that's perfect for adding 8 channels of 10-bit analog input to your microcontroller or microcomputer project

Adafruit FONA 808 MiniGSM + GPS adds cellular voice

now you can program and test out your favorite new parts in SOIC-8 or smaller packages

But the best place to go for detailed information is the VLSI webpage which has app notes

W5500 Ethernet with POE IoT Board (Arduino Compatible) _ws20 Extra 40-pin header of theW5500 Ethernet with POE Mainboard is a new member in our Ethernet family. It is based on the ATmega32u4 and W5500 Ethernet chip, which is quite useful to most IoT projects. W5500 chip is a Hardwired TCP IP embedded Ethernet chip that provides easier Internet connection to embedded systems. It enables users to have the Internet connectivity in their applications just by using the board in which TCP IP stack, 10 100 Ethernet MAC and PHY embedded. W5500