Built-in W5500
Hardwired TCP/IP (8 sockets), 32KB socket buffers
WIZ550io
WIZ550io is an auto configurable Ethernet controller that includes a W5500 (TCP/IP hardwired chip and PHY embedded), a transformer and RJ45. It has a unique real MAC address and configures the network setting automatically. When powered on, WIZ550io initializes itself … with embedded real MAC and sets the default IP address (192.168.1.2) and it can be pinged. Therefore, users are not required to write MAC and network information like IP address, Subnet mask and Gateway address. The WIZ550io is an ideal product for users who want to develop their Internet enabling systems rapidly.
ioModule Form Factor
Support 2×10, 2.54mm header · compact pluggable
SPI
Support Fast-SPI (MODE 0/3)
Ethernet MACPHY
Support 10BaseT/10BaseTe/100BaseTX Ethernet MACPHY
Datasheet
Docs
StoreKey Features
Internet Protocols
Support TCP, UDP, IPv4, ICMP, ARP, IGMPv1/v2, PPPoE
Integrated RJ-45 (MagJack)
Support transformer & Link/Act LEDs built-in
Dedicated TX/RX Buffers
Support 32KB configurable allocation for stable throughput
3.3V -40℃ to 85℃
Support 3.3V Operation (1.8V to 3.3V)
Pin Information
J1 — SPI & Power
| Pin | Type | Name | Description |
|---|---|---|---|
| 1 | P | GND | Ground |
| 2 | P | GND | Ground |
| 3 | I | MOSI | SPI Master-Out / Slave-In |
| 4 | O | MISO | SPI Master-In / Slave-Out |
| 5 | I | SCLK | SPI clock input |
| 6 | I | SCSn | SPI chip select (active low) |
| 7 | P | 3V3D | 3.3 V power |
| 8 | P | 3V3D | 3.3 V power |
J2 — Control & Status
| Pin | Type | Name | Description |
|---|---|---|---|
| 1 | P | 3V3D | 3.3 V power |
| 2 | O | RDY | Low during auto-config, high when ready |
| 3 | I | RSTn | Hardware reset (active low, ≥ 500 µs) |
| 4 | I | NC | Not connected |
| 5 | O | INTn | Interrupt output (low-active, cleared via IR/Sn_IR) |
| 6 | P | GND | Ground |
Features
- Auto network configuration with factory-assigned MAC address
- Integrated transformer and RJ45 (MAGJACK)
- Built-in W5500 TCP/IP offload engine
- SPI interface for host communication
- Power-down and Wake-on-LAN (WoL) support
- Default network setup
- IP: 192.168.1.2
- Subnet: 255.255.255.0
- Gateway: 192.168.1.1
- Dimensions: 54 × 26 × 24 mm (± 0.5 mm)
Version / History
| Version | Date | Description |
|---|---|---|
| 1.0 | 2013-08-01 | Initial release |
| 1.1 | 2014-01-17 | Changed external transformer + RJ-45 to integrated MAGJACK |
| 1.2 | 2015-04-20 | Added 33 Ω resistor on MDI line to reduce EMI; PCB migrated (PADS → Altium) |
| 1.3 | 2018-08-10 | Modified internal 3V3D copper area for improved ESD performance |
Electrical Characteristics
DC Characteristics
| Symbol | Parameter | Pins | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| VDD | Supply voltage | 3.3 V | 2.97 | 3.3 | 3.63 | V |
| VIH | High-level input | ALL | 0.7×Vcc | – | 5.5 | V |
| VIL | Low-level input | ALL | –0.3 | – | 0.3×Vcc | V |
| VOH | High-level output | ALL | 2.9 | 3.3 | – | V |
| VOL | Low-level output | ALL | 0.0 | – | 0.52 | V |
| IDD | Supply current (Normal) | 3.3 V | – | 141 | – | mA |
| IPD | Supply current (Power-down) | 3.3 V | – | 13 | – | mA |
Power Dissipation
| Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|
| 100 Mb/s Link | – | 135 | – | mA |
| 10 Mb/s Link | – | 80 | – | mA |
| Unlink (Auto-negotiation) | 62 | – | 75 | mA |
| 100 Mb/s Tx | 137 | – | 141 | mA |
| 10 Mb/s Tx | – | 83 | – | mA |
| Power-down | – | 13 | – | mA |
Mechanical Information
- PCB Size: 54 mm × 26 mm
- Overall Height: 24 mm (± 0.5 mm)
- Top View:
- Bottom View:
- Drill Map:
Evaluation Boards & Related modules
Complementary WIZnet solutions with diverse interfaces and performance levels
Evaluation Boards
W5500
The W5500 chip is a Hardwired Internet controller with an integrated full TCP/IP stack, enabling Internet connectivity via SPI with up to 80MHz speed. It combines 10/100 Ethernet MAC and PHY for stable connectivity and supports protocols like TCP, UDP, IPv4, among others. With 8 sockets and 32KB internal memory, it simplifies Ethernet application development and includes features like WOL and Power Down Mode for energy efficiency.
W5500-io
W5500-io is a compact size network module that includes a W5500 (TCP/IP hardwired chip and PHY embedded).It can be used as a component and no effort is required to interface W5500. The W5500-io an ideal option for users who want to develop their Internet enabling systems rapidly. W5500-io is hardware compatible with W5100s-io and W6100-io.
WIZ850io
WIZ850io is a compact size network module that includes a W5500 (TCP/IP hardwired chip and PHY embedded), a transformer and RJ45. It can be used as a component and no effort is required to interface W5500 and Transformer. The WIZ850io is an ideal option for users who want to develop their Internet enabling systems rapidly. WIZ850io is hardware compatible with WIZ820io. WIZ820io users, to migrate to WIZ850io, need to modify the Firmware.
WIZ550io
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