UM2638
User manual
Getting started with the X-NUCLEO-S2868A2 Sub-1 GHz 868 MHz RF expansion
board based on S2-LP radio for STM32 Nucleo
Introduction
The X-NUCLEO-S2868A2 expansion board is based on the S2-LP ultra-low power RF transceiver and operates in the 868 MHz
ISM frequency band.
The X-NUCLEO-S2868A2 interfaces with the STM32 Nucleo microcontroller via SPI connections and GPIO pins. Y
change some of the GPIOs by mounting or removing the resistors.
The expansion board is compatible with ST morpho and Arduino UNO R3 connectors.
Figure 1. X-NUCLEO-S2868A2 expansion board
ou can
UM2638 - Rev 1 - December 2019
For further information contact your local STMicroelectronics sales of
fice.
www.st.com
1 Acronyms and abbreviations
Table 1. List of acronyms
Acronym Description
AMR Automatic meter reading
EEPROM Electrically erasable programmable read only memory
GHz Giga Hertz
GUI Graphical user interface
LED Light emitting diode
MCU Microcontroller unit
P2P Point-to-point communication
RF Radio frequency communication
SPI Serial peripheral interface
USB Universal serial bus
wM-Bus Wireless metering bus
WSN Wireless sensors network
UM2638
Acronyms and abbreviations
UM2638 - Rev 1
page 2/19
2 Getting started
2.1 Overview
The X-NUCLEO-S2868A2 main features are:
Based on S2-LP radio
•
• S2-LP narrow band ultra-low power sub-1 GHz transceiver tuned for 860 - 940 MHz frequency band
• Programmable RF output power up to +16 dBm
• Modulation schemes: 2-FSK, 2-GFSK, 4-FSK, 4-GFSK, OOK and ASK
• Air data rate from 0.1 to 500 kbps
• Ultra-low power consumption: 7 mA RX and 10 mA TX at +10 dBm
• IEEE 802.15.4g hardware packet support with whitening, FEC, CRC and dual SYNC word detection
• RX and TX 128 byte FIFO buffers
• Support to wireless M-Bus
• Excellent performance of receiver sensitivity (up to -130 dBm)
• Automatic acknowledgement, retransmission and timeout protocol engine
• Compatible with STM32 Nucleo boards
• Compatible with Arduino UNO R3 connectors
• BALF-SPI2-01D3 IPD balun for matching network and harmonics filter
• Sigfox compatible
• Sample firmware for P2P communication
• 6LoWPAN compatible thanks to STM32Cube
• RoHS and WEEE compliant
The X-NUCLEO-S2868A2 expansion board can be used for the evaluation of the S2-LP device in multiple
applications:
• wM-Bus applications
• Point-to-point communication protocol
• 6LoWPAN applications
• SigFox communication
You can develop other applications for evaluating the devices, such as:
• SigFox communication
• Automatic meter reading
• Home and building automation
• WSN
• Industrial monitoring and control
• Wireless fire and security alarm systems
UM2638
Getting started
UM2638 - Rev 1
page 3/19
2.2 Hardware and software requirements
UM2638
Hardware and software requirements
To use the X-NUCLEO-S2868A2
as shown below.
Figure 2. X-NUCLEO-S2868A2 expansion board connected to an STM32 Nucleo development board
expansion board with STM32 Nucleo development boards, connect the boards
The interconnection between the STM32 Nucleo
any STM32 Nucleo board, although complete testing has only been performed on the NUCLEO-L053R8,
NUCLEO-F401RE and NUCLEO-L152RE boards hosting ultra-low power STM32 microcontrollers.
The minimum hardware and software requirements are listed below:
• a PC/laptop with Microsoft Windows (7 and above) to install the software package (X-CUBE-SUBG1)
• a type A USB to mini-B USB cable to connect the STM32 Nucleo board to the PC/laptop
• 128 MB of RAM
• Approximately 40 MB of hard disk space for the firmware
• Approximately 15 MB of hard disk space for the wM-Bus GUI
The use of the wM-Bus concentrator with the GUI requires additional boards to be connected to the PC. The GUI
can be used to check the wM-Bus communication protocol.
2.3 Board setup
Step 1. Check that the jumper on JP1 connector is connected to provide the required voltage to the board
devices.
Step 2. Connect the X-NUCLEO-S2868A2 to the STM32 Nucleo
Step 3. Power the STM32 Nucleo development board using the Mini-B USB cable.
Step 4. Program the firmware in the STM32 on the STM32 Nucleo development board using the firmware
sample provided.
Step 5. Preset the reset button on the STM32 Nucleo development board.
The evaluation kit is ready-to-use.
and the X-NUCLEO-S2868A2 is designed to allow the use of
board as shown in Figure 2.
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page 4/19
Hardware description and configuration
3 Hardware description and configuration
3.1 Interconnection details
The X-NUCLEO-S2868A2 expansion board and the NUCLEO-F401RE or NUCLEO-L152RE board connection
details are listed in the table below
Table 2. X-NUCLEO-S2868A2 and NUCLEO-L152RE connection details (left connector)
NC IOREF RESET 3V3
CN6 Power CN8 Analog
1 2 3 4 5 6 7 8 1 2 3 4 5 6
3V3 GND GND GPIO0 CSN GPIO1 GPIO2
.
Signal name
V
5
GND GND VIN A0 A1 A2 A3 A4 A5
Connector name
Pin number
NUCLEO-L152RE MCU port
PA0 PA1 PA4 PB0 PC1 PC0
X-NUCLEO-S2868A2 expansion board signals
GPIO0
UM2638
(1
GPIO3
)
Used to enable different configurations in case a signal conflict occurs when using other expansion board
1.
(refer to next section).
Table 3. X-NUCLEO-S2868A2 and NUCLEO-L152RE connection details (right connector)
Signal name
D15 D14 AREF GND D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Connector name
CN5 Digital CN9 Digital
Pin number
10 9 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1
NUCLEO-L152RE MCU port
PB8 PB9 PA5 PA6 PA7 PB6 PC7 PA9 PA8 PB10 PB4 PB5 PB3 PA10 PA2 PA3
X-NUCLEO-S2868A2 expansion board signals
OSI
SPI_C
(1)
SN
nS
(1)
SDN
SDN
(1)
nS
SPI_
CLK
1.
Optional connection
GND
SPI_C
(1)
LK
SPI_MISOSPI_M
3.2 SPI and GPIO connection options
The SPI and GPIO connection options between the STM32 Nucleo and S2-LP can be used to enable dif
configurations in case a signal conflict occurs when using other expansion boards.
ferent
UM2638 - Rev 1
page 5/19
Current measurement
Table 4. S2-LP interface (optional) with STM32 Nucleo board
S2-LP signal Default STM32 port Optional STM32 port
GPIO0 PA0
CSn PA1
CLK PB3
nS PB4
SDN PA8
PC1
T
o use the optional connection, mount R18, unmount R12
PB6
T
o use the optional connection, mount R9, unmount R13
PA5
T
o use the optional connection, mount R6, unmount R11
PA9
T
o use the optional connection, mount R7, unmount R22
PB10
T
o use the optional connection, mount R19, unmount R10
To use the optional connections, modify the firmware on the basis of the STM32 resources used.
UM2638
3.3 Current measurement
To monitor the X-NUCLEO-S2868A2 expansion board power consumption, use jumper JP1: connect an ammeter
probe between the connector pins 1 and 2 for measurements.
3.4 X-NUCLEO-S2868A2 component placement details
The figure below shows the component placement on the X-NUCLEO-S2868A2 expansion board.
Figure 3. X-NUCLEO-S2868A2 on-board device placement
1. Arduino UNO R3 connector
2. Arduino UNO R3 connector
3. S2-LP
4. EEPROM
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page 6/19
X-NUCLEO-S2868A2 on-board device description
4 X-NUCLEO-S2868A2 on-board device description
4.1 SPI EEPROM
The M95640-R is a 64 Kbit serial SPI bus EEPROM with high-speed clock interface. The device can be used to
store the configuration parameters related to S2-LP RF device application or settings.
Features Description
Order code M95640-RMC6TG
Package MLP8
Operating voltage 1.8 to 5.5 V
4.2 S2-LP RF transceiver
UM2638
The X-NUCLEO-S2868A2 expansion board is based on the S2-LP standalone RF transceiver
868 MHz ISM frequency band and wireless M-Bus.
The S2-LP narrow band ultra-low power sub-1 GHz transceiver is tuned for 430-470 MHz and 860 - 940 MHz
frequency bands and programmable RF output power up to +16 dBm.
Table 5. S2-LP details
Features Description
Order code S2-LPQTR
Package QFN24 4x4x1
Operating voltage 1.8 to 3.6 V
. It operates in the
UM2638 - Rev 1
page 7/19
5 Schematic diagrams
LL__1100UU__00880055
RR__110000kk__004400
CSN
1100uuFF
TX
VDDANASYNTH
SDA
SSTTSSAAFFEE--AA110000
CC__115500nn__00440022
1100RR
CC11
GPIO1
LL1122
NNMM
C2
ANT
B2
22
1100ppFF
7
SCL
NNMM
LL1111
1. 4 V t o 1. 8 V max
VRSYNTH
VDDSMPS
2
SDI
18
SDI
17
CC3322
nS
1
RR__110000kk__00440022
1
RESET
LL33
GND
25
OUT
RR3366
CC__115500nn__00440022
CC3344
CCRRYYSSTT AALL__NNXX11661122SSAA
CC__44..77UU __00660033
VDDVCOTX
+3V3
SDO
C1
RX_N
GPIO0
CC__110000pp__00440022
CC22
10
VDDVCOTX
TX
VDD
SS22--LLPP
SDO
1
VDD
GPIO1
21
NC
8
RX_P
A1
CC__11uu__00660033
AAMM1111DDGG--SSTT0011
7
CC__110000pp__00440022
VDDSMPS
RR3377
00RR
110000ppFF
VSMPS2
11
VRRF
12
CC55
CC4422
CC2222
GPIO3
B1
RR3355
IN
LL__1122nnHH__00660033
4
GND
NC
3
CC1100
CC1122
VRSYNTH
RR3388
VCC
2
19
GPIO0
20
D
5
NM
OUT
IN
JJ11
NNMM
CC1177
SDN
GPIO2
CC99
A2
4
CC__115500nn__00440022
22..22KK
3
CC1188
RR__110000kk__00440022
UU44
CC3366
VDDRXDIG
GPIO2
22..22KK
CC__115500nn__00440022
RR33
CC__110000pp__00440022
RR22
CC__110000pp__00440022
CC1166
NM
nW
3
110000ppFF
RXN
13
RR11
UU22
22..77ppFF ,,00440022
CC__1122ppFF__00660033
UU33
SMPS1
3
VDDANASYNTH
8
2
VCC
8
YY11
CC3300
110000nnFF
CC1133
NC
6
4
VSS
CSN
14
15
SSMMAA AANNTTEENNNNAA
MM9955664400
7
CC2255
+3V3
+3V3
CC44 CC88
44..77nnHH
RXP
SDN
6
CC__115500nn__00440022
SCLK
VSMPS2
nS
VRSYNTH
9
VDD
1
LL88
CC__110000nn__00440022
CC__447700pp__00440022
SCL
SCLK
+3V3
VDDRXDIG
SDO
Q
2
+3V3
22..22KK
nHOLD
C
6
CC4411
VDDRXDIG
SDA
VDDVCOTX
CC__115500nn__00440022
GND1
XOUT
5
XIN
NNMM
LL1133
CC3355
VREFVCO
EE11
LL77
CC__115500nn__00440022
RR2244
LL__3399nnHH__00440022
SDI
CC66
5
16
SCLK
UU11
VDDANASYNTH
VDD
VDDSMPS
SMPS2
4
LL22
GND2
GPIO3
23
VRDIG
24
CC1144
BBAALLFF--SSPPII22--0011DD33
RR1100
RR1111
SDA
4
3V3
GPIO3
SDN
+5V
D8
and Female on
CCNN55
RR1166
A0
1
D4
5
10
D6
7
1
GPIO0
SCL
5V
5
00
RR1155
nS
00
1
SCL
TXD/D1
PWM/D9
3
1
JJPP11
PA3RR2233
NNMM
6
GND
A3
4
CSN
Top
8 Pass-Through:
Male on Bottom
00
AREF
9
SDA
RR1133
PWM/D10
4
RXD/D0
2
00
PA2
RR55
D7
8
PC7
nS
RR66
RR1122
A4
5
RR44
SDI
8
+3V3
LLEEDD
SCLK
RR1188 NNMM
SDO
GPIO0
PC7
RESET
NNMM
CCNN88
6 Pass-Through:
Male on Bottom
Top
and Female on
Pass-Through:
Male on Bottom
Top
and Female on
Pass-Through:
Male on Bottom
Top
and Female on
NC
1
A5
6
CCNN66
7
GND
D3
4
VIN
8
NNMMRR1177
D5
6
MISO/D12
6
CSN
00
IOREF
RR99
RR2222
VDD
MOSI/PWM/D11
5
NNMM
2
00
RESET
2
GPIO1
RR1144
00
SCK/D13
7
GND
NNMMRR1199
00
SDN
A2
3
RR77
CCNN99
SCLK
VIN
JJUUMMPPEERR
D2
3
3
2
333300
DD11
GPIO2
AVDDIOREF
00
A1
2
00
Arduino UNO R3 SX connector Arduino UNO R3 DX connector
Figure 4. X-NUCLEO-S2868A2 circuit schematic
UM2638
Schematic diagrams
Figure 5. X-NUCLEO-S2868A2 circuit schematic - Arduino connectors
UM2638 - Rev 1
page 8/19
Figure 6. X-NUCLEO-S2868A2 circuit schematic - ST morpho connectors
13
15
RESET
+3V3
25
27
ST morpho DX connector
Pass-Through: Female on
Bottom and Male on Top
Pass-Through: Female on
Bottom and Male on Top
PC9
BOOT0
22
PD8
11
13
36
38
IOREF
17
19
PA13 PA6
PA7
AGND
PC10
PA15
31
24
26
PC2
PC3
37
11
2
4
6
8
10
21
E5V
PA14
PB0
PC1
26
28
PB15
PC12
PB10
2 30
27
29
PB13
12
14
CN7
PC0
PC5
PC15
PA3
PB14
PA8
33
PA10
PH1/PF1/PD1
PA12
35
1
3
5
7
9
34
NC/PF7
32
PC11
PD2
1
3
5
7
9
PH0/PF0/PD0
PA2
PA4
PA9
2
4
6
8
10
PC14
16
PA11
30
32
35
34
PB4
PB1
9
18
PC7
12
14
PC6
PB12
23
PA5
33
36
38
28
19
PB5
17
1
20
PB8
PC13
U5V
VIN
PB6
16
PC4
NC/PF6
PB2
NC/PF4
25
18
PB9
AVDD
3
37
CN10
21
23
22
24
PB3
PB7
15
PA0
PA1
+5V
NC/PF5
PC8
VLCD/VBAT
PB11/NC
VDD
20
ST morpho SX connector
UM2638
Schematic diagrams
UM2638 - Rev 1
page 9/19
6 Bill of materials
Table 6. X-NUCLEO-S2868A2 bill of materials
Item Q.ty Ref. Part/Value Description Manufacturer Order code
1 1 CN5
2 2 CN6, CN9
3 2 CN7, CN10
4 1 CN8 CON6 550 VAC Connector
5 1 C1
6 7
7 4
8 1 C9
9 1 C12
10 1 C13
11 1 C14
12 2 C16, C36
13 1 C17
14 1 C25
15 1 C41
16 1 C42
17 1 D1
18 1 E1 AM11DG-ST01
19 1 JP1
20 1 J1
C2, C5, C10,
C22, C30, C32,
C34
C4, C6, C8,
C35
CON10 550
V
AC 2.54 mm
pitch
CON8 550 VAC
2.54 mm pitch
Header 19x2
not assembled
2.54 mm pitch
4.7 µF 16 V
±10%
SMD-0603
150 nF 16 V
±10%
SMD-0402
100 pF 16 V
±10%
SMD-0402
100 nF 16 V
±10%
SMD-0402
1 µF 16 V ±10%
SMD-0603
10 pF 50 V
±5% SMD-0402
12 pF 50 V ±5%
SMD-0402
100 pF 16V
±5% SMD-0402
100 pF 16V
±5% SMD-0402
470 pF 16V
±10%
SMD-0402
100 nF 50 V
±5% SMD-0402
10 µF 16 V
±10%
SMD-0805
LED 20 mA
SMD-0603
VH/T M2OE/
W
.325/10/ MOD
RF_IN/OUT,
jack assembly
DC
DC
Connector 4UCON SSQ-110-03-F-S
Connectors 4UCON SSQ-108-03-F-S
Connectors 4UCON SSQ-106-03-F-S
VBAT filter
capacitors
Filter capacitors Murata CL05B154KO5NNNC
VBAT bypass
capacitors
Decoupling
capacitor
SMPS OUT filter
capacitor
Capacitor KEMET
Capacitor Yageo
not mounted KEMET C0402C101J3GACTU
VREFVCO filter Murata UMK105B7471KV
Capacitor Murata
Capacitor YAGEO CL21A106KOQNNNG
Red LED OSRAM LS Q976-NR-1
SMD antenna (not
mounted)
Jumper Any Any
SMA antenna Emerson 142-0701-881
Murata CC0603KRX5R7BB475
Murata C0402C101J3GACTU
Murata GRM155R71C104KA88D
Murata EMK107BJ105KA-T
C0402C100J5GACAUTO7411 or
equivalent
CC0402JRNPO9BN120 or
equivalent
KEMET C0402C101J3GACTU
GRM155R61H104JE14D or
equivalent
Mitsubishi AM11DG-ST01B
UM2638
Bill of materials
UM2638 - Rev 1
page 10/19
Item Q.ty Ref. Part/Value Description Manufacturer Order code
21 1 L2
22 1 L7
23 1 L8
24 1 L11
25 2 L12, L13
26 3 R1, R2, R3
R4, R5, R10,
R1
27 10
28 6
29 1 R23
30 1 R24
31 1 R37
32 3 R35, R36, R38
33 1 TP1 Test point Any Any
34 1 U1 M95640 8-SOIC
35 1 U2 S2-LP QFN-24L
36 1 U3
37 1 U4
38 1 Y1
1, R12, R13,
R14, R15, R16,
R22
R6, R7, R9,
R17, R18, R19
10 µH 250 mA
SMD-0805
12 nH 600 mA
±2% SMD-0603
4.7 nH 220 mA
SMD-0402
8.2 nH 550 mA
SMD-0402
27 nH 300 mA
SMD-0402
100 k 1/16 W
±10%
SMD-0402
1/16 W ±1%
SMD-0402
1/10 W ±5%
SMD-0402
10 R 1/16 W
±1% SMD-0402
0 R 1/16 W
±1% SMD-0402
2.2 K 1/16 W
±1% SMD-0402
Chip scale
package 0.4
mm pitch
STSAFE-A100
SO8N
50 MHz
EXS00ACS08403Crystal NDK NX1612SA
SMPS out inductor Murata LQM21FN100M70L
Wire-wound Murata LQW18AN12NJ00D
Inductor
not mounted Murata LQG15HS8N2J02D
not mounted Taiyo Yuden HK100527NJ-T
Resistors Tyco Electronics CRG0402F100K
Resistors Tyco Electronics CRG0402ZR
Resistors (not
mounted)
Resistor Panasonic ERJ-2GEJ331X
Resistor Yageo RC0402FR-0710RL
Resistor Tyco Electronics CRG0402ZR
Resistors Yageo RC0402FR-072K2L
64 Kbit SPI bus
EEPROM with
high-speed clock
Ultra-low power,
high performance,
sub-1 GHz
transceiver
50 Ω nominal
input / conjugate
match balun to S2LP
, 868 - 927 MHz
with integrated
harmonics filter
Authentication and
brand protection
secure solution
(not mounted)
Johanson
T
echnology Inc.
Any Any
ST M95640-RMN6TP
ST S2-LPQTR
ST BALF-SPI2-01D3
ST STSAFE-A100
L-07C4N7SV6T
UM2638
Bill of materials
39 1/4 wave stubby
40 1 L3
UM2638 - Rev 1
39 nH 300 mA
±5%
SMD_0402
868-915 MHz
flexible whip
antenna
Unshielded
multilayer inductor
LPRS ANT-900MS/ ANT-900MR
Murata LQG15HS39NJ02D
page 11/19
Item Q.ty Ref. Part/Value Description Manufacturer Order code
41 1 C18
2.7 pF 100 V
0.25 pF
SMD_0402
Shunt Murata GRM1555C2A2R7CA01D
UM2638
Bill of materials
UM2638 - Rev 1
page 12/19
Formal notices required by the U.S. Federal Communications Commission ("FCC")
7 Formal notices required by the U.S. Federal Communications
Commission ("FCC")
FCC NOTICE: This device complies with part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) This device may cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
Changes or modifications not expressly approved by the manufacturer could void the user
the equipment.
Additional warnings for FCC
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part
15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If this equipment does
cause harmful interference to radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference's by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and the receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
’s authority to operate
UM2638
UM2638 - Rev 1
page 13/19
Formal product notice required by the Industry Canada ("IC")
8 Formal product notice required by the Industry Canada ("IC")
Innovation, Science and Economic Development Canada Compliance - This device complies with Innovation,
Science and Economic Development RSS standards. 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
interference that may cause undesired operation. Changes or modifications not expressly approved by the
manufacturer could void the user
Conformité à Innovation, Sciences et Développement Économique Canada - Cet appareil est conforme aux
normes RSS d'Innovation, Science et Développement économique. L'utilisation est soumise aux deux conditions
suivantes: (1) cet appareil ne doit pas causer d'interférences nuisibles, et (2) cet appareil doit accepter de
recevoir tous les types d’interférence, y comprises les interférences susceptibles d'entraîner un fonctionnement
indésirable. Les changements ou les modifications non expressément approuvés par le fabricant pourraient
annuler le permis d'utiliser l'équipement.
’s authority to operate the equipment.
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UM2638 - Rev 1
page 14/19
Revision history
able 7. Document revision history
T
Date Revision Changes
12-Dec-2019 1 Initial release.
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UM2638 - Rev 1
page 15/19
UM2638
Contents
Contents
1 Acronyms and abbreviations ......................................................2
2 Getting started ....................................................................3
2.1 Overview .....................................................................3
2.2 Hardware and software requirements..............................................3
2.3 Board setup ...................................................................4
3 Hardware description and configuration ...........................................5
3.1 Interconnection details ..........................................................5
3.2 SPI and GPIO connection options ................................................5
3.3 Current measurement...........................................................6
3.4 X-NUCLEO-S2868A2 component placement details .................................6
4 X-NUCLEO-S2868A2 on-board device description ..................................7
4.1 SPI EEPROM .................................................................7
4.2 S2-LP RF transceiver ...........................................................7
5 Schematic diagrams ...............................................................8
6 Bill of materials ...................................................................10
7 Formal notices required by the U.S. Federal Communications Commission ("FCC")
.
...................................................................................13
8 Formal product notice required by the Industry Canada ("IC") .....................14
Revision history .......................................................................15
UM2638 - Rev 1
page 16/19
UM2638
List of tables
List of tables
able 1. List of acronyms ....................................................................2
T
Table 2. X-NUCLEO-S2868A2 and NUCLEO-L152RE connection details (left connector) ........................5
Table 3. X-NUCLEO-S2868A2 and NUCLEO-L152RE connection details (right connector) .......................5
Table 4. S2-LP interface (optional) with STM32 Nucleo board ...........................................6
Table 5. S2-LP details.......................................................................7
Table 6. X-NUCLEO-S2868A2 bill of materials ..................................................... 10
Table 7. Document revision history .............................................................15
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UM2638
List of figures
List of figures
Figure 1. X-NUCLEO-S2868A2 expansion board ...................................................1
Figure 2. X-NUCLEO-S2868A2 expansion board connected to an STM32 Nucleo development board ..............4
Figure 3. X-NUCLEO-S2868A2 on-board device placement............................................6
Figure 4. X-NUCLEO-S2868A2 circuit schematic ...................................................8
Figure 5. X-NUCLEO-S2868A2 circuit schematic - Arduino connectors ....................................8
Figure 6. X-NUCLEO-S2868A2 circuit schematic - ST morpho connectors..................................9
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UM2638
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