STMicroelectronics X-NUCLEO-S2868A2 User Manual
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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. You can 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
UM2638 - Rev 2 - December 2021
For further information contact your local STMicroelectronics sales office.
www.st.com
1
Acronym
AMR
EEPROM
GHz
GUI
LED
MCU
P2P
RF
SPI
USB wM-Bus
WSN
Acronyms and abbreviations
Table 1. List of acronyms
Description
Automatic meter reading
Electrically erasable programmable read only memory
Giga Hertz
Graphical user interface
Light emitting diode
Microcontroller unit
Point-to-point communication
Radio frequency communication
Serial peripheral interface
Universal serial bus
Wireless metering bus
Wireless sensors network
UM2638
Acronyms and abbreviations
UM2638 - Rev 2 page 2/18
2
2.1
UM2638
Getting started
Getting started
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
RoHS and WEEE compliant
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
•
•
•
•
•
•
•
•
•
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 - Rev 2 page 3/18
2.2
UM2638
Hardware and software requirements
Hardware and software requirements
To use the X-NUCLEO-S2868A2 expansion board with STM32 Nucleo development boards, connect the boards as shown below.
Figure 2. X-NUCLEO-S2868A2 expansion board connected to an STM32 Nucleo development board
2.3
•
•
•
The interconnection between the STM32 Nucleo and the X-NUCLEO-S2868A2 is designed to allow the use of 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 (
128 MB of RAM
X-CUBE-SUBG1 a type A USB to mini-B USB cable to connect the STM32 Nucleo board to the PC/laptop
)
•
•
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.
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 board as shown in
.
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.
UM2638 - Rev 2 page 4/18
UM2638
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.
NC
1
Table 2. X-NUCLEO-S2868A2 and NUCLEO-L152RE connection details (left connector)
IOREF RESET
2 3
Signal name
3V3 5 V GND GND VIN A0 A1
Connector name
CN6 Power
4 5
Pin number
6 7 8
NUCLEO-L152RE MCU port
1 2
PA0
X-NUCLEO-S2868A2 expansion board signals
PA1
A2 A3
CN8 Analog
3
PA4
4
PB0
3V3 GND GND GPIO0 CSN
A4
5
PC1
A5
6
PC0
GPIO1 GPIO2
GPIO0
GPIO3
1. Used to enable different configurations in case a signal conflict occurs when using other expansion board
(refer to next section).
Table 3. X-NUCLEO-S2868A2 and NUCLEO-L152RE connection details (right connector)
Signal name
D15
10
PB8
D14
9
PB9
AREF
8
GND
7
GND
D13 D12 D11 D10 D9 D8
Connector name
D7 D6 D5 D4 D3 D2 D1 D0
6
CN5 Digital
PA5
SPI_C
CN9 Digital
5 4 3
Pin number
2 1 8
NUCLEO-L152RE MCU port
7 6 5 4 3 2 1
PA6 PA7 PB6 PC7 PA9 PA8 PB10 PB4 PB5 PB3 PA10 PA2 PA3
X-NUCLEO-S2868A2 expansion board signals
SPI_MI
SO
SPI_M
OSI
SPI_C
SN
nS
nS
SPI_
CLK
1. Optional connection
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 different configurations in case a signal conflict occurs when using other expansion boards.
S2-LP signal
GPIO0
CSn
Table 4. S2-LP interface (optional) with STM32 Nucleo board
Default STM32 port
PA0
PA1
Optional STM32 port
PC1
To use the optional connection, mount R18, unmount R12
PB6
UM2638 - Rev 2 page 5/18
3.3
3.4
UM2638
Current measurement
S2-LP signal
CLK nS
SDN
Default STM32 port
PB3
PB4
PA8
Optional STM32 port
To use the optional connection, mount R9, unmount R13
PA5
To use the optional connection, mount R6, unmount R11
PA9
To use the optional connection, mount R7, unmount R22
PB10
To use the optional connection, mount R19, unmount R10
To use the optional connections, modify the firmware on the basis of the STM32 resources used.
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.
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
UM2638 - Rev 2 page 6/18
4
4.1
4.2
UM2638
X-NUCLEO-S2868A2 on-board device description
X-NUCLEO-S2868A2 on-board device description
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
Order code
Package
Operating voltage
Description
M95640-RMC6TG
MLP8
1.8 to 5.5 V
S2-LP RF transceiver
The X-NUCLEO-S2868A2 expansion board is based on the S2-LP standalone RF transceiver. It operates in the
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
Package
Operating voltage
S2-LPQTR
QFN24 4x4x1
1.8 to 3.6 V
UM2638 - Rev 2 page 7/18
5
UM2638
Schematic diagrams
Schematic diagrams
VDD
VDDSMPS
VDD
VDDVCOTX
Figure 4. X-NUCLEO-S2868A2 circuit schematic
VDD
VDDANASYNTH
C66
VDD
VDDRXDIG
VRSYNTH nS
SDO
1
2
3
4 nS VCC
8
7
Q nW
VSS nHOLD
C
D
6
5
SCLK
SDI
+3V3
1. 4 V t o 1. 8 V max
OUT
C N66
NC
IOREF
RESET
3V3
5V
GND
GND
VIN
3
4
5
6
7
1
2
8
8 Pass-Through:
Male on Bottom and Female on
Top
C N88
A0
A1
A2
A3
A4
A5
4
5
6
1
2
3
6 Pass-Through:
Male on Bottom and Female on
Top
VSMPS2
LL33
LL22
VDDSMPS
OUT
IN
SDN
1
2
3
4
VDDSMPS
SMPS1
SMPS2
5
6
XOUT
XIN
SDN
SCLK
SDO
18
SDI
17
16
VDDRXDIG
15
RXP
14
RXN
13
SCLK
SDI
SDO
VDDRXDIG
A1
B1
C1
RX_P GND1
RX_N ANT
TX GND2
A2
B2
C2
B ALLF D33
JJ11
S MA TE NN
VDDANASYNTH
VRSYNTH
LL1122
LL1111
3
4
C RY ALL__N X11661122S
2
1 IN LL1133
LL77
VSMPS2
LL88
+3V3
+3V3
A M1111D G--S T0011
NM
1
2
3
4
RESET
VCC
NC
GND
S TS FE
NM
NC
8
7
SCL
NC
SDA
6
5
SCL
SDA
+3V3
+3V3
IOREF
RESET
+5V
VIN
Figure 5. X-NUCLEO-S2868A2 circuit schematic - Arduino connectors
+3V3 VDD
SCL
SDA
AVDD
1
JJU MP R
2 SCLK
SDO
SDI
CSN
PC7 nS
00
00
00
N
00
00
00
00
GPIO0
CSN
GPIO1
GPIO2
GPIO0
GPIO3
PC7 333300
LLE D
SDN
SDN nS
SCLK
00
N
00
00
PA2
PA3
10
9
8
7
6
5
4
3
2
1
C N55
SCL
SDA
AREF
GND
SCK/D13
MISO/D12
MOSI/PWM/D11
PWM/D10
PWM/D9
D8
Pass-Through:
Male on Bottom and Female on
Top
3
2
1
5
4
8
7
6
C N99
D7
D6
D5
D4
D3
D2
TXD/D1
RXD/D0
Pass-Through:
Male on Bottom and Female on
Top
UM2638 - Rev 2 page 8/18
UM2638
Schematic diagrams
Figure 6. X-NUCLEO-S2868A2 circuit schematic - ST morpho connectors
ST morpho DX connector
CN7
PC10
PC12
VDD
BOOT0
NC/PF6
NC/PF7
PA13
PA14
PA15
PB7
PC13
PC14
21
23
PC15
PH0/PF0/PD0
25
27
PH1/PF1/PD1
2
3
VLCD/VBAT
PC2
PC3
9
1
33
35
37
9
11
13
15
17
19
5
7
1
3
6
8
2
4
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
PC11
PD2
E5V
IOREF
RESET
+3V3
+5V
VIN
PA0
PA1
PA4
PB0
PC1
PC0
PC9
PB8
PB9
AVDD
PA5
PA6
PA7
PB6
PC7
PA9
PA8
PB10
PB4
PB5
PB3
PA10
PA2
PA3
ST morpho SX connector
CN10
21
23
25
27
29
31
33
35
37
9
11
13
15
17
19
5
7
1
3
10
12
14
16
6
8
2
4
18
20
22
24
26
28
30
32
34
36
38
PC8
PC6
PC5
U5V
PD8
PA12
PA11
PB12
PB11/NC
PB2
PB1
PB15
PB14
PB13
AGND
PC4
NC/PF5
NC/PF4
Pass-Through: Female on
Bottom and Male on Top
Pass-Through: Female on
Bottom and Male on Top
UM2638 - Rev 2 page 9/18
6
6
7
Item
1
2
3
4
5
15
16
17
20
21
18
19
8
11
12
13
9
10
14
UM2638
Bill of materials
1
1
1
1
1
1
2
1
1
1
Q.ty
1
2
2
1
1
7
4
1
1
1
1
Bill of materials
Table 6. X-NUCLEO-S2868A2 bill of materials
Ref.
CN5
CN6, CN9
CN7, CN10
CN8
C1
C2, C5, C10,
C22, C30, C32,
C34
C4, C6, C8,
C35
C9
C12
C13
C14
C16, C36
C17
C25
C41
C42
D1
JP1
J1
L2
L7
Part/Value
CON10 550
VAC 2.54 mm pitch
CON8 550 VAC
2.54 mm pitch
Description
Connector
Connectors
Header 19x2 not assembled
2.54 mm pitch
Connectors
CON6 550 VAC Connector
4.7 µF 16 V
±10%
SMD-0603
VBAT filter capacitors
150 nF 16 V
±10%
SMD-0402
100 pF 16 V
±10%
SMD-0402
100 nF 16 V
±10%
SMD-0402
Filter capacitors
VBAT bypass capacitors
Decoupling capacitor
1 µF 16 V ±10%
SMD-0603
SMPS OUT filter capacitor
10 pF 50 V
DC
±5% SMD-0402
Capacitor
12 pF 50 V ±5%
SMD-0402
Capacitor
100 pF 16V
±5% SMD-0402
Manufacturer
4UCON
4UCON
4UCON
Murata
Murata
Murata
Murata
Murata
KEMET
Yageo
KEMET
100 pF 16V
±5% SMD-0402 not mounted
470 pF 16V
±10%
SMD-0402
100 nF 50 V
DC
±5% SMD-0402
VREFVCO filter
Capacitor
10 µF 16 V
±10%
SMD-0805
LED 20 mA
SMD-0603
VH/T M2OE/
W.325/10/ MOD
Capacitor
Red LED
Jumper
KEMET
Murata
Murata
YAGEO
OSRAM
Any
RF_IN/OUT, jack assembly
10 µH 250 mA
SMD-0805
SMA antenna
12 nH 600 mA
±2% SMD-0603
Wire-wound
Emerson
SMPS out inductor Murata
Murata
Order code
SSQ-110-03-F-S
SSQ-108-03-F-S
SSQ-106-03-F-S
CC0603KRX5R7BB475
CL05B154KO5NNNC
C0402C101J3GACTU
GRM155R71C104KA88D
EMK107BJ105KA-T
C0402C100J5GACAUTO7411 or equivalent
CC0402JRNPO9BN120 or equivalent
C0402C101J3GACTU
C0402C101J3GACTU
UMK105B7471KV
GRM155R61H104JE14D or equivalent
CL21A106KOQNNNG
LS Q976-NR-1
Any
142-0701-881
LQM21FN100M70L
LQW18AN12NJ00D
UM2638 - Rev 2 page 10/18
36
39
40
37
38
10
6
1
3
1
1
1
1
Q.ty
1
1
2
3
1
26
27
30
31
32
33
28
29
Item
22
23
24
25
34
35 1
1
1
1
1
UM2638
Bill of materials
Ref.
L8
L11
L12, L13
R1, R2, R3
Part/Value
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
Description
Inductor not mounted not mounted
Resistors
Manufacturer
Johanson
Technology Inc.
Murata
Taiyo Yuden
Tyco Electronics
R4, R5, R10,
R11, R12, R13,
R14, R15, R16,
R22
R6, R7, R9,
R17, R18, R19
1/16 W ±1%
SMD-0402
R23
R24
R37
R35, R36, R38
TP1
U1
U2
U3
U4
Y1
L3
C18
Resistors Tyco Electronics
Resistors (not mounted)
1/10 W ±5%
SMD-0402
Resistor
10 R 1/16 W
±1% SMD-0402
Resistor
0 R 1/16 W
±1% SMD-0402
Resistor
2.2 K 1/16 W
±1% SMD-0402
Resistors
Any
Panasonic
Yageo
Tyco Electronics
Yageo
Test point
M95640 8-SOIC
64 Kbit SPI bus
EEPROM with high-speed clock
S2-LP QFN-24L
Ultra-low power, high performance, sub-1 GHz transceiver
Any
ST
ST
Chip scale package 0.4
mm pitch
STSAFE-A100
SO8N
50 Ω nominal input / conjugate match balun to S2-
LP, 868 - 927 MHz with integrated harmonics filter
Authentication and brand protection secure solution
(not mounted)
50 MHz
EXS00ACS084
03
Crystal
1/4 wave stubby
868-915 MHz flexible whip antenna
39 nH 300 mA
±5%
SMD_0402
2.7 pF 100 V
0.25 pF
SMD_0402
Unshielded multilayer inductor
Shunt
ST
ST
NDK
LPRS
Murata
Murata
Order code
L-07C4N7SV6T
LQG15HS8N2J02D
HK100527NJ-T
CRG0402F100K
CRG0402ZR
Any
ERJ-2GEJ331X
RC0402FR-0710RL
CRG0402ZR
RC0402FR-072K2L
Any
M95640-RMN6TP
S2-LPQTR
BALF-SPI2-01D3
STSAFE-A100
NX1612SA
ANT-900MS/ ANT-900MR
LQG15HS39NJ02D
GRM1555C2A2R7CA01D
UM2638 - Rev 2 page 11/18
7
UM2638
Formal notices required by the U.S. Federal Communications Commission ("FCC")
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’s authority to operate 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.
UM2638 - Rev 2 page 12/18
8
UM2638
Formal product notice required by the Industry Canada ("IC")
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’s authority to operate the equipment.
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.
UM2638 - Rev 2 page 13/18
Revision history
Date
12-Dec-2019
20-Dec-2021
Table 7. Document revision history
Revision
1
2
Changes
Initial release.
Updated
UM2638
UM2638 - Rev 2 page 14/18
UM2638
Contents
Contents
7 Formal notices required by the U.S. Federal Communications Commission ("FCC") .
UM2638 - Rev 2 page 15/18
UM2638
List of tables
List of tables
UM2638 - Rev 2 page 16/18
UM2638
List of figures
List of figures
UM2638 - Rev 2 page 17/18
UM2638
IMPORTANT NOTICE – PLEASE READ CAREFULLY
STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement.
Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of
Purchasers’ products.
No license, express or implied, to any intellectual property right is granted by ST herein.
Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product.
ST and the ST logo are trademarks of ST. For additional information about ST trademarks, please refer to www.st.com/trademarks . All other product or service names are the property of their respective owners.
Information in this document supersedes and replaces information previously supplied in any prior versions of this document.
© 2021 STMicroelectronics – All rights reserved
UM2638 - Rev 2 page 18/18
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