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WIZnet Ethernet HAT for Pico (wiznet ethernet for pico)
Raspberry Pi Pico not included

The WIZnet Ethernet HAT is a Raspberry Pi Pico add-on board that utilizes the W5100S embedded internet controller chip to provide an Ethernet connection to your Raspberry Pi Pico via SPI.

The board supports both 3.3V & 5V and can be mounted directly to your Pico as the HAT pinout matches the Raspberry Pi Pico pin footprint 

About the W5100S Embedded Internet Controller

The W5100S is an embedded Internet controller designed as a full hardwired TCP/IP with WIZnet technology. W5100S provides internet connectivity to your Pico by using SPI (Serial Peripheral Interface). SPI provides an easy connection via external MCU to W5100S. The clock speed of W5100S SPI supports up to 70MHz.

Since the W5100S integrates the hardwired TCP/IP stack with 10/100 Ethernet MAC and PHY, it is truly a one-chip solution for stable internet connectivity. WIZnet’s hardwired TCP/IP stack supports TCP, UDP, IPv4, ICMP, ARP, IGMP, and PPPoE - and it has been proven through various applications over the last decade.

The W5100S provides four independent sockets to be used simultaneously and 16KB internal memory for data communication. Users can develop an Ethernet application easily by using the simple W5100S socket program instead of handling a complex Ethernet Controller. W5100S also provides WOL (Wake on LAN) and a Power Down Mode in order to reduce power consumption.

  • Utilises the W5100S embedded internet controller
  • Supports Hardwired Internet Protocols: TCP, UDP, WOL over UDP, ICMP, IGMPv1/v2, IPv4, ARP, PPPoE
  • Supports 4 Independent Hardware SOCKETs simultaneously
  • Internal 16 Kbytes Memory for TX/ RX Buffers
  • Operation Voltage 3.3V / 5V
  • Built-in LDO (LM8805SF5-33V)
  • SPI Interface
  • 5V I/O tolerance
  • 10 / 100 Ethernet PHY embedded
  • Supports Auto Negotiation
  • Full / Half Duplex
  • 10 / 100 Based
  • Built-in RJ45 (RB1-125BAG1A)

Pin Description
I/OPin NameDescription
PVBUSPower supply, 4.3~5.5 Voltage
P3V3Power supply, 3.3 Voltage
PGNDPower ground
IINTnW5100S Interrupt Low activity.
IRSTnW5100S Reset: Low activity
ISPI0 TXSPI MOSI (Master Out Slave In)
ISPI0 CSnSPI Slave Select
OSPI0 RXSPI MISO(Master In Slave Out)


What's in the box?

1x WIZnet Ethernet HAT
2x 20-pin female headers

R134.90  Inc VAT
WIZnet W5100S-EVB-Pico - RP2040 Board with Ethernet (w5100s evb pico rp2040)

The W5100S-EVB-Pico is a microcontroller evaluation board based on the Raspberry Pi RP2040 microcontroller chip and a full hardwired TCP/IP controller W5100S chip.

As the board uses the same pin layout as the Raspberry Pi Pico and includes W5100S embedded ethernet controller, giving you the power of a Raspberry Pi Pico with Ethernet connectivity in a single board!

There's a detailed getting started guide and firmware examples, and it's also the first RP2040-based device to receive AWS IoT Core Qualification!

Don't forget to grab a micro-USB cable for programming. The board comes with a pair of male headers 

  • RP2040 microcontroller with 2MB Flash
    • Dual-core Cortex M0+ at up to 133MHz
    • 264kByte multi-bank high-performance SRAM
    • External Quad-SPI Flash with eXecute In Place (XIP)
    • High-performance full-crossbar bus fabric
    • 30 multi-function General Purpose IO (4 can be used for ADC)
      • 1.8-3.3V IO Voltage (NOTE. Pico IO voltage is fixed at 3.3V)
    • 12-bit 500ksps Analogue to Digital Converter (ADC)
    • Various digital peripherals
      • 2 × UART, 2 × I2C, 2 × SPI, 16 × PWM channels
      • 1 × Timer with 4 alarms, 1 × Real Time Counter
    • 2 × Programmable IO (PIO) blocks, 8 state machines total
    • Flexible, user-programmable high-speed IO
    • Can emulate interfaces such as SD Card and VGA
  • Includes W5100S Embedded Ethernet Controller
    • Supports Hardwired Internet Protocols: TCP, UDP, WOL over UDP, ICMP, IGMPv1/v2, IPv4, ARP, PPPoE
    • Supports 4 Independent Hardware SOCKETs simultaneously
    • Internal 16 Kbytes Memory for TX/ RX Buffers
    • SPI Interface
  • Other Features
    • Micro-USB B port for power and data (and for reprogramming the Flash)
    • 40 pin 21×51 ‘DIP’ style 1mm thick PCB with 0.1″ through-hole pins also with edge castellations
    • 3-pin ARM Serial Wire Debug (SWD) port
    • 10 / 100 Ethernet PHY embedded
    • Supports Auto-Negotiation
      • Full / Half Duplex
      • 10 / 100 Based
    • Built-in RJ45(RB1-125BAG1A)
    • Built-in LDO (LM8805SF5-33V)
Hardware Specification


The W5100S-EVB-Pico pinout is directly connected to the GPIO of RP2040 as shown in the picture above. It has the same pinout as the Raspberry Pi Pico board. However, GPIO16, GPIO17, GPIO18, GPIO19, GPIO20, GPIO21 are connected to W5100S inside the board. These pins enable SPI communication with W5100S to use the Ethernet function.

If you are using the Ethernet function, these pins cannot be used for any other purpose.

The RP2040 GPIO used inside W5100S-EVB-Pico is as follows.

I/OPin NameDescription
IGPIO16Connected to MISO on W5100S
OGPIO17Connected to CSn on W5100S
OGPIO18Connected to SCLK on W5100S
OGPIO19Connected to MOSI on W5100S
OGPIO20Connected to RSTn on W5100S
IGPIO21Connected to INTn on W5100S
IGPIO24VBUS sense - high if VBUS is present, else low
OGPIO25Connected to user LED
IGPIO29Used in ADC mode (ADC3) to measure VSYS/3

Apart from GPIO and ground pins, there are 7 other pins on the main 40-pin interface:

40VBUSMicro-USB input voltage, connected to micro-USB port pin 1. Nominally 5V
39VSYSMain system input voltage, which can vary in the allowed range 4.3V to 5.5V, and is used by the on-board LDO to generate the 3.3V
373V3_ENConnects to the on-board LDO enable pin. To disable the 3.3V (which also de-powers the RP2040 and W5100S), short this pin low
363V3Main 3.3V supply to RP2040 and W5100S, generated by the on-board LDO
35ADC_VREFADC power supply (and reference) voltage, and is generated on W5100S-EVB-Pici by filtering the 3.3V supply
33AGNDGround reference for GPIO26-29
30RUNRP2040 enable pin, To reset RP2040, short this pin low

Operating Conditions

Operation Temperature MAX85C (including self-heating)
Operation Temperature MIN-20C
VBUSDC 5V (+/- 10%)

Recommended maximum ambient temperature of operation is 70C.

ResourcesPackage Contents
  • 1x W5100S-EVB-Pico
  • 2x 20-pin male headers

R249.90  Inc VAT
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