ST X-NUCLEO-S2868A2 User manual

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

Getting started with the X-NUCLEO-S2868A2 Sub-1 GHz 868 MHz RF expansion

board based on S2-LP radio for STM32 Nucleo

UM2638

User manual

UM2638 - Rev 1 - December 2019

For further information contact your local STMicroelectronics sales office. www.st.com

1Acronyms 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

2Getting 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

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

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 (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 board as shown in Figure 2.

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

Hardware and software requirements

UM2638 - Rev 1 page 4/19

3Hardware 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)

Signal name

NC IOREF RESET 3V3 5VGND GND VIN A0 A1 A2 A3 A4 A5

Connector name

CN6 Power CN8 Analog

Pin number

12 3 45678123456

NUCLEO-L152RE MCU port

PA0 PA1 PA4 PB0 PC1 PC0

X-NUCLEO-S2868A2 expansion board signals

3V3 GND GND GPIO0 CSN GPIO1 GPIO2 GPIO0(1

)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 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

GND SPI_C

LK(1)

SPI_MI

SPI_M

OSI

SPI_C

SN(1) nS(1) SDN SDN(1) 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.

UM2638

Hardware description and configuration

UM2638 - Rev 1 page 5/19

Table 4. S2-LP interface (optional) with STM32 Nucleo board

S2-LP signal Default STM32 port Optional STM32 port

GPIO0 PA0 PC1

To use the optional connection, mount R18, unmount R12

CSn PA1 PB6

To use the optional connection, mount R9, unmount R13

CLK PB3 PA5

To use the optional connection, mount R6, unmount R11

nS PB4 PA9

To use the optional connection, mount R7, unmount R22

SDN PA8 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.

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

UM2638

Current measurement

UM2638 - Rev 1 page 6/19

4X-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

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 S2-LPQTR

Package QFN24 4x4x1

Operating voltage 1.8 to 3.6 V

UM2638

X-NUCLEO-S2868A2 on-board device description

UM2638 - Rev 1 page 7/19

5Schematic diagrams

Figure 4. X-NUCLEO-S2868A2 circuit schematic

LL__1100UU__00880055

RR__110000kk__004400

CSN

1100uuFF

VDDANASYNTH

SDA

SSTTSSAAFFEE--AA110000

CC__115500nn__00440022

1100RR

CC11

GPIO1

LL1122

NNMM

ANT B2

1100ppFF

SCL

NNMM

LL1111

1. 4 V t o 1. 8 V max

VRSYNTH

VDDSMPS

SDI

SDI 17

CC3322

RR__110000kk__00440022

1RESET

LL33

GND

OUT

RR3366

CC__115500nn__00440022

CC3344

CCRRYYSSTTAALL__NNXX11661122SSAA

CC__44..77UU__00660033

VDDVCOTX

+3V3

SDO

RX_N

GPIO0

CC__110000pp__00440022

CC22

10 VDDVCOTX

VDD

SS22--LLPP

SDO

VDD

GPIO1 21

NC 8

RX_P

CC__11uu__00660033

AAMM1111DDGG--SSTT0011

CC__110000pp__00440022

VDDSMPS

RR3377

00RR

110000ppFF

VSMPS2

VRRF

CC55

CC4422

CC2222

GPIO3

RR3355

LL__1122nnHH__00660033

4GND

CC1100

CC1122

VRSYNTH

RR3388

VCC

GPIO0 20

OUT

JJ11

NNMM

CC1177

SDN

GPIO2

CC99

CC__115500nn__00440022

22..22KK

CC1188

RR__110000kk__00440022

UU44

CC3366

VDDRXDIG

GPIO2

22..22KK

CC__115500nn__00440022

RR33

CC__110000pp__00440022

RR22

CC__110000pp__00440022

CC1166

110000ppFF

RXN 13

RR11

UU22

22..77ppFF,,00440022

CC__1122ppFF__00660033

UU33

SMPS1

VDDANASYNTH

VCC 8

YY11

CC3300

110000nnFF

CC1133

NC 6

4VSS

CSN

SSMMAA AANNTTEENNNNAA

MM9955664400

CC2255

+3V3

CC44 CC88

44..77nnHH

RXP

SDN

CC__115500nn__00440022

SCLK

VSMPS2

VRSYNTH

VDD

LL88

CC__110000nn__00440022

CC__447700pp__00440022

SCL

SCLK

+3V3

VDDRXDIG

SDO

+3V3

22..22KK

nHOLD

CC4411

VDDRXDIG

SDA

VDDVCOTX

CC__115500nn__00440022

GND1

XOUT

5XIN

NNMM

LL1133

CC3355

VREFVCO

EE11

LL77

CC__115500nn__00440022

RR2244

LL__3399nnHH__00440022

SDI

CC66

SCLK

UU11

VDDANASYNTH

VDD

VDDSMPS

SMPS2

LL22

GND2

GPIO3 23

VRDIG 24

CC1144

BBAALLFF--SSPPII22--0011DD33

Figure 5. X-NUCLEO-S2868A2 circuit schematic - Arduino connectors

RR1100

RR1111

SDA

3V3

GPIO3

SDN

+5V

and Female on

CCNN55

RR1166

A0 1

GPIO0

SCL

5V 5

RR1155

SCL

TXD/D1

PWM/D9

JJPP11

PA3RR2233

NNMM

GND

A3 4

CSN

Top

8 Pass-Through:

Male on Bottom

AREF

9SDA

RR1133

PWM/D10

RXD/D0

PA2

RR55

PC7

RR66

RR1122

A4 5

RR44

SDI

+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

GND

VIN 8

NNMMRR1177

MISO/D12

CSN

IOREF

RR99

RR2222

VDD

MOSI/PWM/D11

NNMM

RESET

GPIO1

RR1144 00

SCK/D13

7GND

NNMMRR1199

SDN

A2 3

RR77

CCNN99

SCLK

VIN

JJUUMMPPEERR

333300 DD11

GPIO2

AVDDIOREF

A1 2

Arduino UNO R3 SX connector Arduino UNO R3 DX connector

UM2638

Schematic diagrams

UM2638 - Rev 1 page 8/19

Figure 6. X-NUCLEO-S2868A2 circuit schematic - ST morpho connectors

RESET

+3V3

ST morpho DX connector

Pass-Through: Female on

Bottom and Male on Top Pass-Through: Female on

Bottom and Male on Top

PC9

BOOT0

PD8

IOREF

PA13 PA6

PA7

AGND

PC10

PA15

PC2

PC3

E5V

PA14

PB0

PC1

PB15

PC12

PB10

2 30 27

PB13

CN7

PC0

PC5

PC15

PA3

PB14

PA8

PA10

PH1/PF1/PD1

PA12

NC/PF7

PC11

PD2

PH0/PF0/PD0

PA2

PA4

PA9

PC14

PA11

PB4

PB1

PC7

PC6

PB12

PA5

PB5

PB8

PC13

U5V

VIN

PB6

PC4

NC/PF6

PB2

NC/PF4

PB9

AVDD

CN10

23 22

PB3

PB7

PA0

PA1

+5V

NC/PF5

PC8

VLCD/VBAT

PB11/NC

VDD

ST morpho SX connector

UM2638

Schematic diagrams

UM2638 - Rev 1 page 9/19

6Bill of materials

Table 6. X-NUCLEO-S2868A2 bill of materials

Item Q.ty Ref. Part/Value Description Manufacturer Order code

1 1 CN5

CON10 550

VAC 2.54 mm

pitch

Connector 4UCON SSQ-110-03-F-S

2 2 CN6, CN9 CON8 550 VAC

2.54 mm pitch Connectors 4UCON SSQ-108-03-F-S

3 2 CN7, CN10

Header 19x2

not assembled

2.54 mm pitch

Connectors 4UCON SSQ-106-03-F-S

4 1 CN8 CON6 550 VAC Connector

5 1 C1

4.7 µF 16 V

±10%

SMD-0603

VBAT filter

capacitors Murata CC0603KRX5R7BB475

6 7

C2, C5, C10,

C22, C30, C32,

C34

150 nF 16 V

±10%

SMD-0402

Filter capacitors Murata CL05B154KO5NNNC

74C4, C6, C8,

C35

100 pF 16 V

±10%

SMD-0402

VBAT bypass

capacitors Murata C0402C101J3GACTU

8 1 C9

100 nF 16 V

±10%

SMD-0402

Decoupling

capacitor Murata GRM155R71C104KA88D

9 1 C12 1 µF 16 V ±10%

SMD-0603

SMPS OUT filter

capacitor Murata EMK107BJ105KA-T

10 1 C13 10 pF 50 VDC

±5% SMD-0402 Capacitor KEMET C0402C100J5GACAUTO7411 or

equivalent

11 1 C14 12 pF 50 V ±5%

SMD-0402 Capacitor Yageo CC0402JRNPO9BN120 or

equivalent

12 2 C16, C36 100 pF 16V

±5% SMD-0402 KEMET C0402C101J3GACTU

13 1 C17 100 pF 16V

±5% SMD-0402 not mounted KEMET C0402C101J3GACTU

14 1 C25

470 pF 16V

±10%

SMD-0402

VREFVCO filter Murata UMK105B7471KV

15 1 C41 100 nF 50 VDC

±5% SMD-0402 Capacitor Murata GRM155R61H104JE14D or

equivalent

16 1 C42

10 µF 16 V

±10%

SMD-0805

Capacitor YAGEO CL21A106KOQNNNG

17 1 D1 LED 20 mA

SMD-0603 Red LED OSRAM LS Q976-NR-1

18 1 E1 AM11DG-ST01 SMD antenna (not

mounted) Mitsubishi AM11DG-ST01B

19 1 JP1 VH/T M2OE/

W.325/10/ MOD Jumper Any Any

20 1 J1 RF_IN/OUT,

jack assembly SMA antenna Emerson 142-0701-881

UM2638

Bill of materials

UM2638 - Rev 1 page 10/19

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