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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 ( 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.

For more information on the W5500 chip inside the WIZ550io module please also refer to the chip's datasheet:


Datasheet History
Version Date Description
1.0.0 2013-08-01 Initial Release
1.0.1 2013-09-13 Corrected duplicated statements and typing errors (P.14, 23, 24, 28, 39, 51) Corrected descriptions (P.35)
1.0.2 2013-11-14 Changed “descriptions of pin at 1.1 Pin Descriptions” (P.10) starting ”It must be tied to GND to NC (PIN38..42)” / 2. corrected typing error: starting “0x02 to 0x42 value of SOCK_MACRAW at 4.2 Socket Registers(P.50)”
1.0.3 2014-05-29 Corrected “Sn_MSSR at 4.2 Socket Register” (P.53): wrong descriptions of Sn_MSSR about FMTU/MTU
1.0.4 2014-06-13 1. Added Note about reading size register value (P.56, 58) / 2. Added IR Reflow Temperature Profile (P.66)
1.0.5 2014-11-11 1. Added description for MISO pin (P.11):The SCSn signal defines MISO pin output value / 2. Modified the register notation (P.33), Modified the register notation “Sn_IR at 4.2 Socket Register” (P.49) :from [R] to [RCW1] / 3. Corrected typing error: from DICON to DISCON of Sn_SR at 4.2 Socket Register (P.50)
1.0.6 2014-12-30 Corrected typing error : from 0x02 to 0x42 value of SOCK_MACRAW “Sn_CR at 4.2 Socket Registers”(P.46)
1.0.7 2016-02-24 1. Corrected Interrupt Assert Wait Time function (P.34) / 2. Notice PLLclk is 150MHz (P.34)
1.0.8 2017-05-19 1. Corrected Driver Level Range Unit uW/MHz to uW (P.60)
1.0.9 2019-05-22 1. Corrected Sn_IMR Description (P.55) 2. Corrected Junction temperature Min value TJ (P.57) 3. Added Maximum junction temperature TJMAX (P.58)

WIZ550io History
Version Date Description
1.0 2013-08-01 Initial Release
1.1 2014-01-17 Changed “External Transformer + RJ-45 to MAGJACK(inside transformer)”
1.2 2015-04-20 Added “Resistor 33R in MDI line. because EMI issue.”
Changed “PCB artwork. because changed develop tool(PADS → Altium) ”
1.3 2018-08-10 Modified “inner 2 layer copper foil (3V3D). This copper foil plated below of CHAND area. It may affect ESD.”

2013/08/30 10:01 · bongbong
products/wiz550io/start.txt · Last modified: 2015/03/16 10:33 (external edit)