The W5500 is an Ethernet IC. It is a popular hardwired TCP/IP controller developed by WIZnet. It integrates a 10/100 Mbps Ethernet MAC and PHY along with a built-in TCP/IP stack. This IC based modules are useful for adding Ethernet connectivity to microcontroller based projects such as Arduino, ESP32, STM32 and PIC IC.
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This article describes the W5500 Ethernet IC pinout and how each pin group are used in real world applications.
What Is the W5500 Ethernet IC?
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The W5500 is a tiny semiconductor or hardwired TCP/IP Ethernet controller that supports protocols like TCP, UDP, ICMP, IPv4, ARP, IGMP and PPPoE. Unlike the software based Ethernet stacks, the W5500 can handles all the protocols processing internally and it will reducing the MCU load and simplifying firmware development.
It can communicates with the host microcontroller via a high speed SPI interface and it supports up to 8 independent hardware sockets at a time.
W5500 Ethernet IC Pinout
Ethernet PHY Interface Pins
Pin Name
Function
TXP
Ethernet transmit positive
TXN
Ethernet transmit negative
RXP
Ethernet receive positive
RXN
Ethernet receive negative
AVDD
Analog 3.3V supply
AGND
Analog ground
SPI Interface Pins
Pin Name
Description
SCSn
SPI chip select (active LOW)
SCLK
SPI clock input
MOSI
SPI data input
MISO
SPI data output
INTn
Interrupt output (active LOW)
RSTn
Hardware reset input (active LOW)
Power supply and Ground Pins
Pin Name
Description
VDD
Digital 3.3V power supply
GND
Digital ground
AVDD
Analog 3.3V supply
AGND
Analog ground
1V2O
Internal 1.2V regulator output
Clock Pins
Pin Name
Function
XI / CLKIN
25 MHz crystal or external clock input
XO
Crystal output
PHY Mode Selection Pins
Pin Name
Description
PMODE0
PHY mode select
PMODE1
PHY mode select
PMODE2
PHY mode select
LED Indicator Pins
Pin Name
Function
LINKLED
Link status
ACTLED
Network activity
SPDLED
Speed indication
DUPLED
Duplex mode indication
Reference and Special purpose Pins
Pin Name
Description
EXRES1
External 12.4kΩ resistor to AGND
TOCAP
4.7µF capacitor for internal reference
VBG
Bandgap reference (leave floating)
RSVD
Reserved pins (tie to GND)
DNC
Do not connect
Conclusion
The W5500 Ethernet IC is a powerful and very best solution for adding Ethernet connectivity to the embedded systems. Understanding its pinout and pin functions is essential for correct hardware designing and stable network performance. Whether you used as a bare IC or as a ready made module, the W5500 simplifies Ethernet implementation by handling all TCP/IP tasks internally.
Akhil Satheesh is an electronics expert and the Founder and CEO of Soldering Mind. Specializes in designing innovative electronic circuits and custom, high-performance PCB layouts. Every project he shares on solderingmind.com is rigorously bench-tested to ensure accuracy for makers and hobbyists alike.
