ST X-NUCLEO-S2868A1 Bedienungsanleitung

Introduction

The X-NUCLEO-S2868A1 expansion board is based on the S2-LP radio and operates in the 868 MHz ISM frequency band.

The expansion board is compatible with ST morpho and Arduino UNO R3 connectors.

The X-NUCLEO-S2868A1 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.

Figure 1. X-NUCLEO-S2868A1 expansion board

Getting started with the X-NUCLEO-S2868A1 Sub-1 GHz 868 MHz RF expansion

board based on S2-LP radio for STM32 Nucleo

UM2405

User manual

UM2405 - Rev 1 - May 2018

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

UM2405

Acronyms and abbreviations

UM2405 - Rev 1 page 2/19

2Getting started

2.1 Overview

The X-NUCLEO-S2868A1 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

• Support to SMD and SMA antennas

•BALF-SPI2-01D3 IPD balun for matching network and harmonics filter

• Sigfox compatible

• Sample firmware for P2P communication

• 6LoWPAN compatible thanks to STM32Cube

• RoHS compliant

The X-NUCLEO-S2868A1 expansion board can be used for the evaluation of the S2-LP device in multiple

applications.

The following demo samples are available for testing:

• wM-Bus demo

• Point-to-point communication protocol demo

• 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

2.2 Hardware and software requirements

To use STM32 Nucleo development boards with the X-NUCLEO-S2868A1 expansion board, connect the boards

as shown below.

UM2405

Getting started

UM2405 - Rev 1 page 3/19

Figure 2. X-NUCLEO-S2868A1 expansion board connected to an STM32 Nucleo development board

The interconnection between the STM32 Nucleo and the X-NUCLEO-S2868A1 has been designed to allow using

any STM32 Nucleo board, although complete testing has been performed using NUCLEO-L053R8, NUCLEO-

F401RE and NUCLEO-L152RE boards hosting the ultra-low power STM32.

The following software and hardware specifications are required:

• 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 sample.

2.3 Board setup

Step 1. Check that the jumper on J1 connector is connected to provide the required voltage to the board

devices.

Step 2. Connect the X-NUCLEO-S2868A1 to the STM32 Nucleo board as shown in Figure 2. X-NUCLEO-

S2868A1 expansion board connected to an STM32 Nucleo development board

Step 3. Power the Nucleo development board using the Mini-B USB cable

Step 4. Program the firmware in the STM32 on the Nucleo development board using the firmware sample

provided

Step 5. Reset the MCU board using the reset button on the Nucleo development board

Step 6. The evaluation kit is ready-to-use

UM2405

Board setup

UM2405 - Rev 1 page 4/19

3Hardware description and configuration

3.1 Interconnection details

The X-NUCLEO-S2868A1 expansion board and the NUCLEO-F401RE or NUCLEO-L152RE board connection

details are listed in the table below.

Table 2. X-NUCLEO-S2868A1 and NUCLEO-L152RE connection details (left connector)

Signal name

NC IOREF RESET3V35VGND GND VIN A0 A1 A2 A3 A4 A5

Connector name

CN6 Power CN8 Analog

Pin number

1 2 3 4 5 6 7 8 1 2 3 4 5 6

NUCLEO-L152RE MCU port

PA0 PA1 PA4 PB0 PC1 PC0

X-NUCLEO-S2868A1 expansion board signals

3V3GND 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-S2868A1 and NUCLEO-L152RE connection details (right connector)

Signal name

D15 D14 AREFGND 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 PB10PB4 PB5 PB3 PA10PA2 PA3

X-NUCLEO-S2868A1 expansion board signals

GND

SPI_

CLK(

SPI_

MIS

SPI_

MOS

SPI_

CSN(

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 and S2-LP can be used to enable different

configurations in case a signal conflict occurs when using other expansion boards.

UM2405

Hardware description and configuration

UM2405 - 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 PC7 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 R8, unmount R6

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-S2868A1 expansion board power consumption, use jumper J1: connect an ammeter

probe between the connector pins 1 and 2 for measurements.

3.4 X-NUCLEO-S2868A1 component placement details

The figure below shows the component placement on the X-NUCLEO-S2868A1 expansion board.

UM2405 Current

measurement

UM2405 - Rev 1 page 6/19

Figure 3. X-NUCLEO-S2868A1 on-board device placement

4X-NUCLEO-S2868A1 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

To use the on-board SPI EEPROM, mount R22 resistor on the board.

4.2 S2-LP radio

The X-NUCLEO-S2868A1 expansion board is based on the S2-LP standalone RF transceiver. It operates in the

868 MHz ISM frequency band and wireless M-Bus.

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

UM2405

X-NUCLEO-S2868A1 on-board device description

UM2405 - Rev 1 page 8/19

5Formal 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.

UM2405

Formal notices required by the U.S. Federal Communications Commission ("FCC")

UM2405 - Rev 1 page 9/19

6Formal 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.

UM2405

Formal product notice required by the Industry Canada ("IC")

UM2405 - Rev 1 page 10/19

7Bill of materials

Table 6. X-NUCLEO-S2868A1 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 2.54 mm pitch

Header

connector (not

assembled)

4UCON SSQ-106-03-F-S

4 1 CN8 CON6 550 VAC Connector Any Any

5 1 C1 4.7 µF 16 V ±10%

SMD-0603 VBAT filter Murata CC0603KRX5R7BB475

6 7

C2, C5,

C10, C22,

C30, C32,

C34

150 nF 16 V

±10% SMD-0402 Filter Murata CL05B154KO5NNNC

7 4 C4, 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

cap Murata EMK107BJ105KA-T

10 1 C13 10 pF 16 V ±10%

SMD-0603 Murata GCM1885C1H100JA16D

11 1 C14 12 pF 16 V ±5%

SMD-0603 Murata GRM1885C1H120JA01J

12 2 C16, C36 100 pF 16 V ±5%

SMD-0402 KEMET C0402C101J3GACTU

13 1 C17 100 pF 16 V ±5%

SMD-0402 NM KEMET C0402C101J3GACTU

14 1 C25 470 pF 16 V

±10% SMD-0402 VREFVCO filter Murata UMK105B7471KV

15 1 C41 100 nF 16 V

±10% SMD-0805 TAIYO YUDEN EMK105B7104KV

16 1 C42 10 µF 16 V ±10%

SMD-0805 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

WALCON.100/VH

/T M2OE/

W.325/10/ MOD

Jumper Any ANY

20 1 J1 SMA-LAT SMA antenna Emerson 142-0701-881

21 1 L2 10 µH 250 mA

SMD-0805

SMPS out

inductor Murata CV201210-100K

22 1 L7 12 nH 300 mA

SMD-0603 TX choke Murata L-14C12NJV4T

UM2405 Bill

of materials

UM2405 - Rev 1 page 11/19

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