Last update: 2014/02/07 16:36

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Printed on 2014/03/11 19:52

J2

1

P

3V3D

Power: 3.3V Power Supply

2

O

RDY

READY

This pin is asserted to low after power on.

When RSTn is activated, WIZ550io does auto configuration with embedded

MAC and default IP address.

After configuration gets completed, WIZ550io raises this pin to HIGH in order

to inform about the completion of WIZ550io’s configuration.

Host processor can only control WIZ55oio when RDY pin is HIGH.

3

I

RSTn

Reset: Low activity

This pin is to initialize WIZ550io.

Hold at least 500us after asserted to LOW and wait for at least 150ms after it

is changed to HIGH until WIY550io configured itself.

4

I

NC

Not Connected

5

O

INTn

Interrupt: Low activity

This pin indicates that W5500 inside WIZ550io requires

MCU's due to events like socket connection, disconnection, data receiving

timeout and WOL (Wake on Lan).

The interrupt is cleared by writing IR register or Sn_IR.

All interrupts are maskable.

6

P

GND

Ground

Caution)

Some users may want to reinitialize W5500 inside WIZ550io with SW reset, not handling RSTn pin. It

will make WIZ550io hang up due to clearance of all information in the registers of W5500. A tiny MCU

inside WIZ550io initializes W5500 with embedded MAC address and a default IP address and

Initialization is triggered by RSTn.

In case of SW reset, all registers in W5500 will be cleared and WIZ550io will not initialize itself. All

information inside WIZ550io will be lost and WIZ550io will hang up instead.

Therefore, we recommend HW reset instead of SW reset. Nevertheless, if users want to use SW reset,

we recommend to save MAC address and network information including IP address, Subnet mask and

Gateway address before SW reset, and writing those information to WIZ550io after SW reset.

2013/08/28 09:08 · jameskim

SPI Operations

There is a W5500 inside WIZ550io. Therefore SPI operation of WIZ550io follows one of W5500. For

more information about SPI operation of WIZ550io, please refer to W5500 Datasheet.

Datasheet

W5500 Datasheet v1.0.2 - English

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W5500 Datasheet v1.0.2 - Korean

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