ST X-NUCLEO-IDW01M1 User manual

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November 2015
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www.st.com
UM1975
User manual
Getting started with X-NUCLEO-IDW01M1 Wi-Fi expansion
board based on SPWF01SA module for STM32 Nucleo
Introduction
This document provides detailed hardware requirements and board connections for the X-NUCLEO-
IDW01M1 Wi-Fi board based on SPWF01SA Serial-to-Wi-Fi Modules, to allow expansion of the STM32
Nucleo boards. The SPWF01SA module is FCC (FCC ID: VRA-SG9011203), IC certified (IC: 7420A-
SG9011203) 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-IDW01M1 can be plugged onto STM32 Nucleo boards thanks to the ST morpho and
Arduino™ UNO R3 connectors, and the same connectors allow different expansion boards to be easily
stacked on the X-NUCLEO-IDW01M1 board so you can evaluate Wi-Fi connectivity with different
devices in several applications.
The expansion board has the following features:
Onboard SPWF01SA module (order code: SPWF01SA.11) based on the STM32 MCU and a low
power Wi-Fi b/g/n transceiver SoC
USART configurable connections
Jumpers to obtain the SPWF01SA module RESET and I/O board signals (user software
dependent)

Getting Started
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Figure 1: X-NUCLEO-IDW01M1 Wi-Fi expansion board based on SPWF01SA module

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Contents
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Contents
1Getting Started ................................................................................ 6
1.1 Hardware requirements.....................................................................6
1.2 System requirements ........................................................................7
1.3 Setting up the board..........................................................................7
2Hardware description...................................................................... 8
2.1 X-NUCLEO-IDW01M1 expansion board for STM32 Nucleo .............8
2.2 UART and GPIO connection options............................................... 10
2.3 Current measurement ..................................................................... 12
2.4 X-NUCLEO-IDW01M1 component placement details ..................... 12
3Component descriptions .............................................................. 13
3.1 SPWF01SA module ........................................................................ 13
3.2 User push-buttons and LED............................................................ 13
3.3 Radio certification............................................................................ 14
3.3.1 Formal notices required by the U.S. Federal Communications
Commission (FCC)........................................................................................... 14
3.3.2 Formal notices required by Industry Canada (IC) ............................ 14
3.3.3 Formal notices required by the ETSI (CE) ....................................... 14
4Board schematic and bill of materials ......................................... 15
4.1 STM32 Nucleo connections ............................................................ 15
4.2 Bill of materials................................................................................ 15
4.3 Schematic diagram .........................................................................18
4.4 Revision history............................................................................... 19

List of tables
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List of tables
Table 1: Interconnection between STM32 Nucleo board and X-NUCLEO-IDW01M1 (ST morpho
connector - CN7).........................................................................................................................................8
Table 2: Interconnection between STM32 Nucleo board and X-NUCLEO-IDW01M1 (ST morpho
connector - CN10).......................................................................................................................................9
Table 3: Interconnection between STM32 Nucleo board and X-NUCLEO-IDW01M1 (Arduino UNO R3
Connector CN6 - Power).............................................................................................................................9
Table 4: Interconnection between STM32 Nucleo board and X-NUCLEO-IDW01M1 (Arduino UNO R3
Connector CN8 - Analog) .........................................................................................................................10
Table 5: Interconnection between STM32 Nucleo board and X-NUCLEO-IDW01M1 through (Arduino
UNO R3 Connector CN5 - Digital) ............................................................................................................10
Table 6: Interconnection between STM32 Nucleo board and X-NUCLEO-IDW01M1 through (Arduino
UNO R3 Connectors CN9 - Digital) ..........................................................................................................10
Table 7: SPWF01SA module UART interface - (optional) with STM32 Nucleo board .............................11
Table 8: SPWF01SA details .....................................................................................................................13
Table 9: Push-buttons and LED functions ................................................................................................13
Table 10: Bill of materials (1 of 2) .............................................................................................................15
Table 11: Bill of materials (2 of 2) .............................................................................................................16
Table 12: Document revision history ........................................................................................................19

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List of figures
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List of figures
Figure 1: X-NUCLEO-IDW01M1 Wi-Fi expansion board based on SPWF01SA module ..........................2
Figure 2: X-NUCLEO-IDW01M1 plugged with STM32 Nucleo board ........................................................6
Figure 3: X-NUCLEO-IDW01M1 component placement details...............................................................12
Figure 4: X-NUCLEO-IDW01M1 board schematic ...................................................................................18

Getting Started
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1 Getting Started
This section describes the hardware requirements for the X-NUCLEO-IDW01M1 expansion
board.
1.1 Hardware requirements
The X-NUCLEO-IDW01M1 is an expansion board for the STM32 Nucleo boards. To
function correctly, the X-NUCLEO-IDW01M1 must be plugged to the STM32 Nucleo board
through the ST morpho or ARDUINO UNO R3 connectors as shown in the figure below.
Information on STM32 Nucleo is available on ST website at http://www.st.com/stm32nucleo
Figure 2: X-NUCLEO-IDW01M1 plugged with STM32 Nucleo board
The interconnection between the STM32 Nucleo board and the X-NUCLEO-IDW01M1 is
designed to work with any STM32 Nucleo board, even though complete testing was
focused on the NUCLEO-L053R8 hosting the ultra-low power STM32L053R8T6, the
NUCLEO-F401RE hosting the dynamic efficiency STM32F401RET6 and the NUCLEO-
F103RB hosting the Mainstream Performance line STM32F103RBT6.

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1.3 System requirements
Using the STM32 Nucleo boards with the X-NUCLEO-IDW01M1 expansion board requires
the following software and hardware:
Windows PC (XP, Vista, 7, 8) to install the firmware package
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 the following:
128 MB of RAM
40 MB of hard disk space
The X-CUBE-WIFI1 firmware and relative documentation are available on www.st.com
1.4 Setting up the board
To set up the board:
1. Ensure that a jumper on the JP3 (position 1-2) connector is connected. This jumper
provides the RESET signal to the SPWF01SA module on the board.
2. Ensure that a jumper on the JP4 (position 1-2) connector is connected. This jumper
provides the 2.5 V internal power supply to the GPIO6_ADC0 module signal.
3. Plug the X-NUCLEO-IDW01M1 on the STM32 Nucleo board, as shown in Figure 2:
"X-NUCLEO-IDW01M1 plugged with STM32 Nucleo board"
4. Power the STM32 Nucleo board through the Mini-B USB cable
5. Program the STM32 Nucleo board using the sample firmware provided
6. Reset the STM32 Nucleo board MCU with the onboard Reset button
7. The solution is ready to be used to evaluate Wi-Fi connectivity

Hardware description
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2 Hardware description
This section describes the X-NUCLEO-IDW01M1 features and provides useful information
for understanding the board schematics.
2.1 X-NUCLEO-IDW01M1 expansion board for STM32 Nucleo
The expansion board allows the user to test the functionality of the module. The
SPWF01SA module embeds a low power Wi-Fi b/g/n transceiver SoC, SMD antenna and
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.
Please, refer to user manuals UM1724 and UM1725 available on www.st.com for further
information on STM32 Nucleo boards.
The SPWF01SA module and the STM32 Nucleo board are connected through connectors
CN7 (see Table 1: "Interconnection between STM32 Nucleo board and X-NUCLEO-
IDW01M1 (ST morpho connector - CN7)") and CN10 Table 2: "Interconnection between
STM32 Nucleo board and X-NUCLEO-IDW01M1 (ST morpho connector - CN10)".
Moreover, considering that signals available on CN5, CN6, CN8 and CN9 are also
replicated on CN7 even and CN10 odd pin, it useful to indicate the indirect connection
between STM32 Nucleo board and X-NUCLEO-IDW01M1 (see tables from Table 3:
"Interconnection between STM32 Nucleo board and X-NUCLEO-IDW01M1 (Arduino UNO
R3 Connector CN6 - Power)" to Table 6: "Interconnection between STM32 Nucleo board
and X-NUCLEO-IDW01M1 through (Arduino UNO R3 Connectors CN9 - Digital)").
Pins marked with an asterisk (*) indicate an alternative pin for that specific
function and pins marked with a hash (#) indicate a specific function reserved for
future use and, not yet implemented on the module SPWF01SA.
Table 1: Interconnection between STM32 Nucleo board and X-NUCLEO-IDW01M1 (ST morpho
connector - CN7)
CN7 odd
CN7 even
Pin
Name
Fcn
Fcn
Name
Pin
1
2
3
PC12
WIFI_RST
GPIO10
PD2
4
5
VDD
E5V
6
7
GND
8
9
10
11
IOREF
12
13
RESET
14
15
PA14
GPIO13
+3V3
16
17
+5V
18
19
GND
GND
20
21
PB7
USART_RX*
GND
22
23
VIN
24

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CN7 odd
CN7 even
25
26
27
USART_CTS*
PA0
28
29
USART_RTS*
PA1
30
31
32
33
VBAT
34
35
36
37
38
Table 2: Interconnection between STM32 Nucleo board and X-NUCLEO-IDW01M1 (ST morpho
connector - CN10)
CN10 odd
CN10 even
Pin
Name
Fcn
Fcn
Name
Pin
1
GPIO6
PC8
2
3
PB8
I2C_SCL#
4
5
PB9
I2C_SDA#
USART_RX*
PC5
6
7
AVDD
U5V
8
9
GND
10
11
USART_RTS
PA12
12
13
USART_CTS
PA11
14
15
SPI_CS#
PB12
16
17
PB6
USART_TX*
18
19
GND
20
21
PA9
USART_TX
22
23
24
25
SPI_MOSI#
PB15
26
27
SPI_MISO#
PB14
28
29
SPI_CLK#
PB13
30
31
AGND
32
33
PA10
USART_RX
USART_TX*
PC4
34
35
PA2
USART_TX*
36
37
PA3
USART_RX*
38
Table 3: Interconnection between STM32 Nucleo board and X-NUCLEO-IDW01M1 (Arduino
UNO R3 Connector CN6 - Power)
Signal Name
NC
IOREF
RESET
3V3
5V
GND
GND
VIN
Pin
1
2
3
4
5
6
7
8
MCU Name
Fcn
3V3
GND
GND

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Table 4: Interconnection between STM32 Nucleo board and X-NUCLEO-IDW01M1 (Arduino
UNO R3 Connector CN8 - Analog)
Signal
Name
A0
A1
A2
A3
A4
A5
Pin
1
2
3
4
5
6
MCU Name
PA0
PA1
PA4
PB0
PC1/ PB9
PC0/ PB8
Fcn
USART_CTS*
USART_RTS*
GPIO13*
Table 5: Interconnection between STM32 Nucleo board and X-NUCLEO-IDW01M1 through
(Arduino UNO R3 Connector CN5 - Digital)
Signal
Name
D15
D14
AREF
GND
D13
D12
D11
D10
D9
D8
Pin
10
9
8
7
6
5
4
3
2
1
MCU Name
PB8
PB9
PA5
PA6
PA7
PB6
PC7
PA9
Fcn
I2C_
SCL#
I2C_
SDA#
GND
UART_
TX*
UART_
TX
Table 6: Interconnection between STM32 Nucleo board and X-NUCLEO-IDW01M1 through
(Arduino UNO R3 Connectors CN9 - Digital)
Signal
Name
D7
D6
D5
D4
D3
D2
D1
D0
Pin
8
7
6
5
4
3
2
1
MCU Name
PA8
PB10
PB4
PB5
PB3
PA10
PA2
PA3
Fcn
UART_RX
USART_RX(1)
USART_TX(1)
Notes:
(1)used by STM32 on Nucleo board and connected to ST-LINK
2.2 UART and GPIO connection options
As stated previously, the connection between the SPWF01SA and the STM32 Nucleo
boards is made via a four wire UART (with hardware flow control) and some GPIOs. A
multiple connection arrangement offers maximum modularity (See Table 4). The alternative
pins could be useful in case of conflicts with additional X-NUCLEO expansion boards.

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Table 7: SPWF01SA module UART interface - (optional) with STM32 Nucleo board
SPWF01SA
Pin / Signal
STM32 Pin
Placement
6 / TXDI
PA10
(default)
CN10 –pin 33
CN9 –Pin 3
To use this connection: mount R4 and remove R33, R34, R37
PC5
CN10 –pin 6
To use this optional connection: mount R33 and remove R4, R34,
R37
PB7
CN7 –pin 21
To use this optional connection: mount R34 and remove R4, R33,
R37
PA3
CN9 –pin 2
CN10 - pin 35
To use this optional connection: mount R37 and remove R4(1)), R33,
R34
8 / RXDI
PA9 (default)
CN10 –pin 21
CN5 –pin 1
To use this optional connection: mount R11 and remove R9, R35,
R36
PC4
CN10 –pin 34
To use this optional connection: mount R35 and remove R8, R9, R36
PB6
CN10 –pin 17
CN5 –Pin 3
To use this optional connection: mount R9 and remove R8, R35, R36
PA2
CN9 –pin 1
CN10 –pin 37
To use this optional connection: mount R36 and remove R8(1), R9,
R35
9 /
CTS1_DN
PA11(default)
CN10 –pin 14
To use this connection: mount R2 and remove R39
PA0
CN8 –pin 1
CN7 –pin 28
To use this optional connection: mount R39 and remove R2
10 /
RTS1_DP
PA12
CN10 –pin 12
To use this connection: mount R6 and remove R38
PA1
CN8 –pin 2
CN7 –pin 30
To use this optional connection: mount R38 and remove R6
Notes:
(1) please refer to UM1724 for instructions on how to modify the STM32 Nucleo board to use these pins.
To use the optional connections, you need to modify the firmware for the right allocation of
STM32 resources.

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2.3 Current measurement
To monitor the power consumption of the onboard SPWF01SA module, remove the R3
(0 Ω resistor) and, using jumper JP1 contacts as connectors, insert an ammeter probe
between pins 1 and 2 of the connector and measure current absorption.
Since the power consumption of the SPWF01SA module is usually very low, accurate
instrumentation able to take measurements in the order of a few µA may be required.
2.4 X-NUCLEO-IDW01M1 component placement details
The following figure shows component placement on the X-NUCLEO-IDW01M1 board
Figure 3: X-NUCLEO-IDW01M1 component placement details

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Component descriptions
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3 Component descriptions
This section describes the devices included on the X-NUCLEO-IDW01M1 expansion
board.
check whether resistor R21 is present on the X-NUCLEO-IDW01M1 board; if it is,
please remove it as it may interfere with JTAG debug.
3.1 SPWF01SA module
The SPWF01SA module is FCC (FCC ID: VRA-SG9011203), IC (IC: 7420A-SG9011203)
and CE certified. The SPWF01SA contains a low power Wi-Fi b/g/n transceiver SoC - a
highly integrated Wi-Fi system dedicated to the WLAN management and compliant with Wi-
Fi network specifications. The interface of the device to the STM32 Nucleo boards is via a
UART interface and some GPIO pins. The SPWF01SA module also integrates an SMD
antenna and has an embedded 38.4 MHz oscillator for the embedded Wi-Fi radio.
Table 8: SPWF01SA details
Feature
Description
Sales type
SPWF01SA.11
Package
SMD 30 pin
Operating voltage
Typ. 3.3 V
3.2 User push-buttons and LED
To command certain I/O signals and signal SPWF01SA module status information, the X-
NUCLEO-IDW01M1 expansion board has two push-buttons and four LEDs.
The hardware and firmware functions associated with the push-buttons and LEDs are
shown in the following table:
Table 9: Push-buttons and LED functions
Feature
Description
RESET (hardware, by the user)
Push the SW1 push-button on the board
GPIO7_ADC1 module signal (hardware &
firmware dependent, by the user)
Push the SW2 push-button on the board
3.3 V board power supply on
LED 1 (green) lit
GPIO10 mod. signal (firmware dependent)
LED 2 (blue) lit
GPIO14 mod. signal (firmware dependent)
LED 3 (red) lit
GPIO13 mod. signal (firmware dependent)
LED 4 (yellow) lit

Component descriptions
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3.4 Radio certification
3.4.1 Formal notices required by the U.S. Federal Communications
Commission (FCC)
Any changes or modifications to this equipment not expressly approved by
STMicroelectronics may cause harmful interference and void the user’s authority to operate
this equipment.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following
two conditions: (1) this device may not cause harmful interference, and (2) this device must
accept any interference received, including any interference that may cause undesired
operation.
This device uses, generates and radiates radio frequency energy. The radio frequency
energy produced by this device is well below the maximum exposure limit established by
the Federal Communications Commission (FCC).
The X-NUCLEO-IDW01M1 contains the FCC certified SPWF01SA module (FCC ID: VRA-
SG9011203).
3.4.2 Formal notices required by Industry Canada (IC)
English:
This device complies with Industry Canada license-exempt RSS standard(s). Operation is
subject to the following two conditions: (1) this device may not cause interference, and (2)
this device must accept any interference, including interference that may cause undesired
operation of the device.
French:
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils
radio exempts de licence. 'Exploitation est autorisée aux deux conditions suivantes : (1)
l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter
tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en
compromettre le fonctionnement.
The X-NUCLEO-IDW01M1 contains the IC certified SPWF01SA module (IC: 7420A-
SG9011203)
3.4.3 Formal notices required by the ETSI (CE)
This module complies with the following European EMI/EMC and safety directives and
standards:
ETSI EN 300 328 V1.8.1:2012
EN 301 489-1 V1.9.2:2011 + EN 301 489-17 V2.2.1:2009
EN 60950-1:2006 + A11:2009 + A1:2010 + A12:2011 + A2:2013
EN 62479:2010

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4 Board schematic and bill of materials
4.1 STM32 Nucleo connections
The X-NUCLEO-IDW01M1 expansion board is designed to be plugged directly on the
STM32 Nucleo board connectors. The X-NUCLEO-IDW01M1 is configured by default to be
compatible with the highest number of STM32 Nucleo boards possible. It may be also be
configured, via resistor placement, to use different I/O configurations in order to match
specific customer targets. Refer to the X-NUCLEO-IDW01M1 user manual for more
detailed information regarding the possible I/O configuration options.
Check to see if resistor R21 is present; if it is, please remove it as it may interfere with
JTAG debug.
4.2 Bill of materials
Table 10: Bill of materials (1 of 2)
Item
Quantity
Reference
Description
Note
1
10
C1,C3,C5,C6,C7,C
8, C9,C10,C11,C12
Bypass capacitor / signal
delay / filtering
2
1
C2
Bypass capacitor
3
1
C4
Bypass capacitor
4
1
CN8
Arduino UNO R3 connector
5
2
CN6,CN9
Arduino UNO R3 connector
6
1
CN5
Arduino UNO R3 connector
7
2
CN7,CN10
ST morpho connector
8
1
J1
Debug connector
Not Mounted
9
2
J2
Module IO for
Development
10
2
JP1,JP2
Option jumper
11
2
JP3,JP4
Option jumper
12
1
LED1
Power LED
13
1
LED2
Blinking while module is
running
14
1
LED3
Wi-Fi power UP
15
1
LED4
Wi-Fi link UP
16
3
R3,R19,R21
Option resistor (default)
17
1
R15
Filter for IRQ signal
18
3
R18,R22,R23
Current polarization for
LEDs
19
1
R5
Current polarization for
power LED

Board schematic and bill of materials
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Item
Quantity
Reference
Description
Note
20
4
R1,R13,R16,R17
Current limitation for 3.3 V
signal
21
1
R24
Signal pull-up
22
1
R14
Signal pull-down
23
0
R7,R20,R26,R28,R
29,R30,R31,R32
Option selection (optional)
Not Mounted
24
4
R2,R4,R6,R8
Option selection (default)
25
0
R9,R33,R34,R35,R
36,R37,R38,R39
Option selection (optional)
Not Mounted
26
1
U1
LDO power supply
27
1
U2
Signal level shifter
28
2
SW1,SW2
User push button
29
2
TP1,TP2
Test point
30
1
WF1
SPWF01SA Serial-to-Wi-Fi
Modules
31
1
PCB
X-NUCLEO-IDW01M1
PCB
Table 11: Bill of materials (2 of 2)
Item
Package
Manufacturer
Manufacturer’s
ordering code
Value
1
0603
MURATA
GRM188R71C104KA01D
100 nF 16 V
2
0603
MURATA
GCM188R71C105KA64D
1 uF 16 V
3
0805
MURATA
GCM21BR70J106KE22L
10 uF 6.3 V
4
FEMALE ON
TOP
HARWIN
SAMTEC
M20-7820646
SSQ-106-03-G-S
6 pins, 2.54 F
5
FEMALE ON
TOP
HARWIN
SAMTEC
M20-7820846
SSQ-108-03-F-S
8 pins, 2.54 F
6
FEMALE ON
TOP
HARWIN
SAMTEC
M20-7821046
SSQ-110-03-F-S
10 pins, 2.5 F
7
FEMALE ON
BOTTOM
4UCON
18507
20565
20600
Strip 19 x 2p 2.54
8
Female in top
STELVIO KONTEK
6778268508410-R
SOCKET
CONNECTOR 8p R/A
SINGLE ROW
pitch = 1.27 mm
9
7pins x 2lines
--
--
strip 7x2p 2.54
10
2pins x 1line
--
--
strip 2p 2.54
11
3pins x 1line
--
--
strip 3p 2.54
12
0603
--
--
GREEN LED

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Item
Package
Manufacturer
Manufacturer’s
ordering code
Value
13
0603
--
--
BLUE LED
14
0603
--
--
RED LED
15
0603
--
--
YELLOW LED
16
0603
--
--
0 Ω
17
0603
--
--
100 Ω ±5%
18
0603
--
--
270 Ω ±5%
19
0603
--
--
470 Ω ±5%
20
0603
--
--
4.7 kΩ ±5%
21
0603
--
--
10 kΩ ±5%
22
0603
--
--
220 kΩ ±5%
23
0603
--
--
Not mounted
24
0805
--
--
0 Ω
25
0805
--
--
Not mounted
26
SOT323-5L
STMicroelectronics
STLQ50C25R
STLQ50C25R
27
QFN10 (1.8 x
1.4)
Any
Interface between a 3.3 V
bus and a 2.5 V
Mounted on board -
STMicroelectronics
ST2G3236QTR
28
SMD
ITT
IN SUNG METAL
CO
ALPS
or equivalent
KSR221J
IT-1210-S
SKQYAB (G4822969M)
29
1 pin
--
--
strip 1p
30
15.24x26.924
STMicroelectronics
SPWF01SA.11
SPWF01SA.11
Serial-to-Wi-Fi
Modules)
31
54.5x70mm
--
--
P.C.B. PC91A.V03

Board schematic and bill of materials
UM1975
18/20
DocID028608 Rev 1
4.4 Schematic diagram
Figure 4: X-NUCLEO-IDW01M1 board schematic

UM1975
Board schematic and bill of materials
DocID028608 Rev 1
19/20
4.5 Revision history
Table 12: Document revision history
Date
Version
Changes
06-Nov-2015
1
Initial release.