ST X-NUCLEO-IDW04A1 User manual

July 2017

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www.st.com

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User manual

Getting started with the X-NUCLEO-IDW04A1 Wi-Fi expansion

board based on SPWF04SA module for STM32 Nucleo

Introduction

This document provides detailed hardware requirements and board connections for the X-NUCLEO-

IDW04A1 Wi-Fi expansion board based on SPWF04SA Serial-to-Wi-Fi modules, to allow expansion of

the STM32 Nucleo boards. The SPWF04SA module is FCC (FCC ID: S9NSPWFS04), IC certified (IC:

8976C-SPWFS04) and CE certified and includes an STM32 MCU, a low-power 2.4 GHz IEEE 802.11

b/g/n transceiver with integrated power amplifier and power management, and an SMD antenna.

The X-NUCLEO-IDW04A1 can be plugged onto STM32 Nucleo boards via the Arduino™ UNO R3

connector (ST morpho connector compatibility is also available). Therefore, different expansion boards

can easily be stacked on the X-NUCLEO-IDW04A1 board, allowing evaluation of Wi-Fi connectivity

together with several devices in different application scenarios.

The expansion board features:

Onboard SPWF04SA module (order code: SPWF04SA) based on the STM32 MCU and a low

power Wi-Fi b/g/n transceiver SoC

USART or SPI configurable connections

Jumpers to drive the SPWF04SA module RESET and low power capabilities

Push button to explore Wi-Fi protected setup feature

Connectors for SPWF04SA module GPIOs (user software dependent)

Figure 1: X-NUCLEO-IDW04A1 expansion board

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Contents

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Contents

1Getting started.................................................................................5

1.1 Hardware requirements.....................................................................5

1.2 System requirements ........................................................................5

1.3 Board setup.......................................................................................6

2Hardware description......................................................................8

2.1 X-NUCLEO-IDW04A1 expansion board for STM32 Nucleo..............8

2.2 STM32 Nucleo connections ............................................................12

2.3 UART/SPI interface and GPIO connection options .........................12

2.4 Current measurement .....................................................................13

2.5 X-NUCLEO-IDW04A1 component placement details......................14

3Component description ................................................................16

3.1 SPWF04SA module ........................................................................16

3.2 User push-buttons and LEDs ..........................................................16

3.3 User interface configuration ............................................................16

4Radio certification.........................................................................18

4.1 Formal notices required by the U.S. federal communications

commission (FCC) .......................................................................................18

4.2 Formal notices required by industry Canada (IC)............................18

4.3 Formal notices required by the ETSI (CE) ......................................18

5Bill of materials..............................................................................19

6Schematic diagrams......................................................................22

7Revision history ............................................................................23

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List of tables

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List of tables

Table 1: UART/SPI 0 Ω resistor configuration ............................................................................................6

Table 2: STM32 Nucleo board/X-NUCLEO-IDW04A1 interconnection (ST morpho connector: CN7) ......9

Table 3: STM32 Nucleo board/X-NUCLEO-IDW04A1 interconnection (ST morpho connector: CN7):

hardware ...................................................................................................................................................10

Table 4: STM32 Nucleo board/X-NUCLEO-IDW04A1 interconnection (ST morpho connector: CN10) ..10

Table 5: STM32 Nucleo board/X-NUCLEO-IDW04A1 interconnection (Arduino UNO R3 connector: CN6

- power).....................................................................................................................................................11

Table 6: STM32 Nucleo board/X-NUCLEO-IDW04A1 interconnection (Arduino UNO R3 connector: CN8

- analog)....................................................................................................................................................11

Table 7: STM32 Nucleo board/X-NUCLEO-IDW04A1 interconnection (Arduino UNO R3 connector: CN5

- digital) .....................................................................................................................................................11

Table 8: STM32 Nucleo board/X-NUCLEO-IDW04A1 interconnection (Arduino UNO R3 connector: CN9

- digital) .....................................................................................................................................................11

Table 9: SPWF04SA module UART interface with STM32 Nucleo board ...............................................12

Table 10: SPWF04SA module SPI interface with STM32 Nucleo board .................................................13

Table 11: SPWF04SA module details ......................................................................................................16

Table 12: Push-buttons and LED functions ..............................................................................................16

Table 13: X-NUCLEO-IDW04A1 board user mode configuration settings...............................................17

Table 14: X-NUCLEO-IDW04A1 bill of materials .....................................................................................19

Table 15: Document revision history ........................................................................................................23

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List of figures

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List of figures

Figure 1: X-NUCLEO-IDW04A1 expansion board......................................................................................1

Figure 2: X-NUCLEO-IDW04A1 expansion board connected to an STM32 Nucleo board........................5

Figure 3: UART default jumper configuration .............................................................................................6

Figure 4: SPI jumper configuration .............................................................................................................6

Figure 5: SPWF04SA module to STM32 Nucleo connector scheme.........................................................9

Figure 6: X-NUCLEO-IDW04A1 expansion board component placement details: top ............................14

Figure 7: X-NUCLEO-IDW04A1 expansion board component placement details: bottom ......................15

Figure 8: X-NUCLEO-IDW04A1 circuit schematic....................................................................................22

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1 Getting started

1.1 Hardware requirements

The X-NUCLEO-IDW04A1 is an expansion board for the STM32 Nucleo boards. To

function correctly, it must be plugged on a STM32 Nucleo board through the Arduino™

UNO R3 connectors as shown in the figure below. Information on STM32 Nucleo is

available at http://www.st.com/stm32nucleo.

Figure 2: X-NUCLEO-IDW04A1 expansion board connected to an STM32 Nucleo board

The X-NUCLEO-IDW04A1 can be connected to any STM32 Nucleo board, even though

complete testing was performed on the NUCLEO-L476RG, NUCLEO-F401RE and

NUCLEO-F411RE development boards.

1.2 System requirements

Using the STM32 Nucleo boards with the X-NUCLEO-IDW04A1 expansion board requires:

a Windows PC (7, 8 and above) to install the firmware package;

a USB type A to Mini-B USB cable to connect the STM32 Nucleo board to the PC.

Installation of the board firmware package (order code: X-CUBE-WIFI1) and the Wi-Fi

graphical user interface utility on the user PC requires:

128 MB of RAM

40 MB of hard disk space

The X-CUBE-WIFI1 firmware and relative documentation are available on www.st.com.

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Getting started

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1.3 Board setup

To set up the board:

Ensure that a jumper on JP3 is connected (position 1-2); it sends the RESET

signal to the SPWF04A1 module on the board.

Ensure that jumpers on JP6, JP7, JP8, JP9 are connected (position 1-2); they link

UART module signals to STM32 Nucleo UART peripheral.

If the SPI interface is preferred, ensure that jumpers JP6, JP7, JP8, JP9 (position

2-3) are connected.

Ensure that jumpers on JP10, JP11, JP12, JP13 are connected (for position and

configuration, refer to Figure 3: "UART default jumper configuration"and MicroPython 0

Ω resistors are unsoldered.

These jumpers are needed to properly drive UART module signals to the STM32

Nucleo. Figure 3: UART default jumper configuration

If the SPI interface is preferred, ensure that jumpers on JP10, JP11, JP12, JP13

are connected (for position and configuration, refer to Figure 4: "SPI jumper

configuration" and MicroPython 0 Ω resistors are unsoldered. Moreover, JP5 must

be closed. Figure 4: SPI jumper configuration

If the MicroPython feature is preferred, remove jumpers on JP10, JP11, JP12,

JP13 (refer to the following table for a full 0 Ω resistor configuration).

Table 1: UART/SPI 0 Ω resistor configuration

Peripheral

R11

R36

R42

R43

R44

R47

R48

UART

SPI

Plug the X-NUCLEO-IDW04A1 on the STM32 Nucleo board, as shown in Figure 2:

"X-NUCLEO-IDW04A1 expansion board connected to an STM32 Nucleo board".

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Power the STM32 Nucleo development board through the Mini-B USB cable.

Program the STM32 Nucleo development board using the sample firmware

provided.

Reset the STM32 Nucleo development board MCU through the onboard Reset

button.

The board setup is ready to evaluate Wi-Fi connectivity.

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Hardware description

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2 Hardware description

2.1 X-NUCLEO-IDW04A1 expansion board for STM32 Nucleo

The expansion board allows testing of the functionality of the SPWF04SA module, which

embeds a low power Wi-Fi b/g/n transceiver SoC, an SMD antenna and an STM32 MCU.

Board functionality can be manipulated through the firmware packaged with the X-CUBE-

WIFI1 software, which must be programmed on the STM32 Nucleo board microcontroller

(refer to user manuals available on www.st.com for further information on STM32 Nucleo

boards).

The SPWF04SA module and the STM32 Nucleo board are connected through connectors

CN5, CN6, CN8 and CN9 (Figure 5: "SPWF04SA module to STM32 Nucleo connector

scheme"). Moreover, considering that signals are also replicated on CN7 (Table 2: "STM32

Nucleo board/X-NUCLEO-IDW04A1 interconnection (ST morpho connector: CN7)") and

CN10 (Table 4: "STM32 Nucleo board/X-NUCLEO-IDW04A1 interconnection (ST morpho

connector: CN10)"), it is useful to show the indirect connection between STM32 Nucleo

board and X-NUCLEO-IDW04A1 (Table 5: "STM32 Nucleo board/X-NUCLEO-IDW04A1

interconnection (Arduino UNO R3 connector: CN6 - power)", Table 6: "STM32 Nucleo

board/X-NUCLEO-IDW04A1 interconnection (Arduino UNO R3 connector: CN8 - analog)",

Table 7: "STM32 Nucleo board/X-NUCLEO-IDW04A1 interconnection (Arduino UNO R3

connector: CN5 - digital)" and Table 8: "STM32 Nucleo board/X-NUCLEO-IDW04A1

interconnection (Arduino UNO R3 connector: CN9 - digital)").

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