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This page provides information about the hardware of WIZ550web and its Baseboard as following:

  • Basic Hardware Specification
  • Operating Characteristics & I/O Characteristics
  • Reference Schematics
  • Dimension information

The revision history will be updated in this page in case of any changes of hardware specification or exterior design.

Hardware Specification


  • MCU : STM32F103RCT6 (256KB Flash, 48KB SRAM)
  • TCP/IP Controller : W5500
  • RJ45(Integrated Transformer) : J1B1211CCD
  • External Flash Memory : AT45DB081D
  • EEPROM : 24AA64T-I/OT
  • 2.54mm Pin Header x 2

WIZ550web Pinout


Pin Description

As it is used in the EVB and for the web-server by default

Ref No.Pin No.SymbolTypeDescription
J11D0I/ODigital 0 I/O
:::2D1I/ODigital 1 I/O
:::3D2I/ODigital 2 I/O
:::4D3I/ODigital 3 I/O
:::5D4I/ODigital 4 I/O
:::6D5I/ODigital 5 I/O
:::7D6I/ODigital 6 I/O
:::8D7I/ODigital 7 I/O
:::9D8I/ODigital 8 I/O / Boot Pin
:::10D9I/ODigital 9 I/O
:::11D10I/ODigital 10 I/O
:::12D11I/ODigital 11 I/O
:::13D12I/ODigital 12 I/O
:::14D13I/ODigital 13 I/O
:::15D14I/ODigital 14 I/O
:::16D15I/ODigital 15 I/O
:::17NRSTISystem Reset Input, Active Low
:::18BOOT0IBOOT0 Input, Active High
Ref No.Pin No.SymbolTypeDescription
J213V3DPSupply DC +3.3V , Digital Power
:::23V3DPSupply DC +3.3V , Digital Power
:::33V3APSupply DC +3.3V , Analog Power
:::4VBATPSupply DC +3.3V , Low Power Mode
:::5A0IAnalog 0 Input
:::6A1IAnalog 1 Input
:::7A2IAnalog 2 Input
:::8A3IAnalog 3 Input
:::9UART2_RXIReceiver input for UART2
:::10UART2_TXOTransmitter output for UART2
:::11UART2_RTSORequest To Send output for UART2
:::12UART2_CTSIClear To Send input for UART2
:::13UART1_RXIReceiver input for UART1
:::14UART1_TXOTransmitter output for UART1
:::15UART1_RTSORequest To Send output for UART1
:::16UART1_CTSIClear To Send input for UART1
:::17GNDPDigital Power Ground
:::18GNDPDigital Power Ground
:::19GNDAPAnalog Power Ground

WIZ550web Baseboard

  • DC 9~24V Power Input
  • Digital Output 8EA (Relay - HR91C-05)
  • Digital Input 8EA (Photocouplers - TLP290-4)
  • Analog Input 4EA
  • RS-232C
  • RS-422

WIZ550web Baseboard Pinout

WIZ550web Baseboard Pinout

WIZ550web Baseboard Callout

WIZ550web Baseboard Callout

Digital Output Port

WIZ550web Baseboard has eight (D0-D7) relay output stage. Below is a photo of basic internal circuit. Jumper, relay NC (Normal close) and NO (Normal Open) can be set. WIZ550WEB Digital Output Port See the table below for State action.

Input valueRelay status valueNC output valueNO output value

Output port voltage and current characteristics, see the table below.

NO5A 28VDC10A 125VAC5A 250VAC
NC3A 28VAC5A 125VDC3A 250VDC

Digital Input Port

WIZ550web Baseboard has eight (D8 to D15) Photocoupler via a digital input columns. Below is a photo of basic internal circuit. There is no polarity input, and ON/OFF is distinguished from this potential difference between the two input signals.

WIZ550WEB Digital Input Port

See the table below for the electrical characteristics of the input.

Under 1.4VLow
Over 2.1VHigh
Max Voltage24V
Potential differenceNo. There are two input signals On/Off by potential difference

Four (D8-D11) digital inputs are connected as shown in tact switch inside the Baseboard, and these connections have select Jumper J23-J26. WIZ550WEB Digital Input Jumper

Analog Input Port

WIZ550web Baseboard has four (A0-A3) analog input columns. Below is a photo of basic internal circuit. It is possible to simply enter 0 to 12V and has entered in the WIZ550WEB through the internal circuitry. WIZ550WEB Analog Input Port

Two of the Analog Input (A0, A1) have connected with a variable resistor (10K) and a temperature sensors (TC1047AVNB) in the Baseboard, this connection can opt to J26, J28 Jumper. WIZ550WEB Analog Input Jumper

AC/DC Characteristics


General Operating Conditions

VDDStandard operating voltage3V3D23.33.6V
VDDAAnalog operation voltage (ADC not used)3V3A2.03.33.6V
:::Analog operation voltage (ADC used)3V3A2.43.33.6V
VBATBackup operating voltageVBAT0.83.33.6V
VINI/O Digital input voltageD0~D150-VDD+0.3V
:::I/O Analog input voltageA0~A30-VDD+0.3V

I/O Static Characteristic

VILLow level input voltageD0~D15-0.5-0.7V
VIHHigh level input voltageD0~D152.0-VDDV
VIOOutput current sunk by any I/O and control pinD0~D15--25mA
:::Output current source by any I/O and control pinD0~D15---25mA
VIL(NRST)NRST Input low level voltageNRST-0.5-0.8V
VIH(NRST)NRST Input high level voltageNRST2-3.3V

Reference Schematic & Parts


WIZ550web Baseboard1.0Download

Parts Datasheet

STM32F103RCT6ARM 32-bit Cortex™-M3 CPU CoreSTM32F103RCT6
W5500WIZnet TCP/IP ChipW5500
AT45DB081D-SU8-Megabit Serial Flash MemoryAT45DB081D-SU
24AA64T-I/OT64K I2C™ Serial EEPROM24AA64T-I/OT
J1B1211CCDTransformer + RJ45 + LED, IndustrialJ1B1211CCD
HR91C-051 pole, 3-10A Relay, 1c(SPDT)HR91C-05
SP3485ENLow Power Half-Duplex RS-485 TransceiversSP3485EN
SP3232EBEYTrue +3.0V to +5.5V RS-232 TransceiversSP3232EBEY
TC1047AVNBTemperature to Voltage SensorTC1047AVNB
LM358APWRDual Operational AmplifiersLM358APWR
TLP290-44-Channel Transistor-Output PhotocouplersTLP290-4
AOZ1210AIEZBuck 2A Simple Buck RegulatorAOZ1210AI


74.95mm(W) x 30mm(L) x 24mm(H) (±0.5)

WIZ550web Baseboard

145mm(W) x 85mm(L) x 28mm(H) (±0.5)