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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.

For the detailed information on implementation of Hardware TCP/IP, refer to the W5500 Datasheet.


Hardware Specification


  • Plugin Network Module.
  • Hardware compatible with WIZ820io.
  • Usable without H/W design for W5500, Transformer & RJ45.
  • Fast evaluation for W5500 & MCU in the target board.
  • Support high speed SPI interface.
  • Support power down mode and Wake-on-LAN function
  • Very small form factor : 23mm x 25mm x 18mm
  • 1 x 6, 2.54mm Pin Header x 2

Pin Out

 WIZ850io Pinmap

Pin Description

Pin No. Pin Type Pin Name Description
J1 1 P GND Ground
2 P GND Ground
3 I MOSI SPI Master Out Slave In
This pin is used for SPI MOSI signal pin
4 I SCLK SPI Clock
This pin is used for SPI Clock Signal pin
5 I SCNn SPI Slave Select
This pin is used for SPI Slave Select Signal Pin when using SPI interface
6 I INTn W5500 Interrupt : Low activity
This pin is used for indicating event like socket TCP connection, disconnection, data receiving timeout, WOL(Wake on Lan) and so on occurred in W5500 inside WIZ550io.
The interrupt is cleared by writing IR register or Sn_IR. All interrupts are maskable.
Pin No. Pin Type Pin Name Description
J2 1 P GND Ground
2 P 3.3V Power : 3.3V power supply
3 P 3.3V Power : 3.3V power supply
4 - NC Not Connect
5 I RSTn Reset : Low activity
Hold at least 500us after asserted to LOW and keep HIGH until next Reset needed.
6 O MISO SPI Master In Slave Out
This pin is used for SPI MISO signal pin

User need to wait for 50ms after this pin is changed to HIGH to communicate with WIZ850io. (Refer to 5. Timing Diagram)


DC Charcteristic

Symbol Parameter Pins Min Typ Max Unit
VDD Supply voltage 3.3V 2.97 3.3 3.63 V
VIL High level input voltage ALL 2.0 5.5 V
VIH Low level input voltage ALL -0.3 0.8 V
VOL Low level output voltage ALL 0.4 V
VOH High level output voltage ALL 2.4 V
LOL Low level output Current ALL 8.6 13.9 18.9 mA
LOH High level output Current ALL 12.5 26.9 47.1 mA
IDD Supply Current
(Normal operation mode)
3.3V 132 mA
LOH Supply Current
(Power Down mode)
3.3V 13 mA

Power Dissipation

Condition Min Typ Max Unit
100M Link - 128 - mA
10M Link - 75 - mA
Un-Link (Auto-negotiation mode) - 65 - mA
100M Transmitting - 132 - mA
10M Transmitting - 79 - mA
Power Down mode - 13 - mA

SPI Operations

As WIZ850io consists of W5500 and others, SPI operation of WIZ850io follows one of W5500. For more information about SPI operation of WIZ850io, please refer to W5500 Datasheet.

Timing Diagram

Reset Timing

 WIZ850io Reset Timing

Symbol Description Min Max
TRC Reset Cycle Time 500us -
TPL Internal Auto Configuration Time - 50ms

SPI Timing

WIZ850io SPI Timing

Symbol Description Min Max Units
Fsck SCLK Clock Frequency - 80 MHz
TWH SCLK High duration 6 - ns
TWL SCLK Low duration 6 - ns
TCS nSCS High duration 5 - ns


Description of Changes

  • V1.0 ⇒ V1.1
    • Changes to all PCB layout for improve Ethernet performance.
    • Changes to improve electrical properties(EMS, EMI)
    • Removed L2, Added C17


  • WIZ850io V1.0 3D PDF : Download
  • This PDF must be run using the 'Adobe Acrobat'.

 WIZ850io Dimension

See Also

  • WizWiki Forum : WIZnet Forum for Technical support and Project shared

Where to Buy

WIZnet Online Shop
WIZnetUS Online Shop, USA WIZnetEU Online Shop, Germany WIZnetKorea Online Shop, Korea

products/wiz850io/start.txt · Last modified: 2020/10/07 09:12 by jeongsk