ST X-NUCLEO-S915A1 Manual de usuario

Getting started with the X-NUCLEO-S2915A1 Sub-1 GHz 915 MHz

RF expansion board based on S2-LP radio for STM32 Nucleo

October 2018 1/21

www.st.com

User manual

Introduction

The X-NUCLEO-S915A1 expansion board is based on the S2-LP radio and

operates in the 915 MHz ISM frequency band.

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

connectors.

The X-NUCLEO-S2915A1 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 boards are equipped with the following features:

• On-board S2-LP, sub-1 GHz transceiver device

• SPI EEPROM for saving parameters

• 860 to 930 MHz RF Front-End Module(power amplifier)

• LED for user interface

• Jumper at 3V3 for checking the current consumption of the expansion

board

Figure 1. Sub-1 GHz expansion board based on S2-LP for STM32

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Contents

1Description..................................................................................................3

1.1 Typical applications ....................................................................................... 3

1.2 Abbreviations ................................................................................................. 4

2Getting started............................................................................................5

2.1 Overview ....................................................................................................... 5

2.2 Hardware and software requirements ............................................................ 6

2.3 Board setup ................................................................................................... 7

3Hardware description and configuration..................................................8

3.1 Interconnection details ................................................................................... 8

3.2 SPI and GPIO connection options ................................................................. 9

3.3 Current measurement .................................................................................. 11

3.4 X-NUCLEO-S2915A1 component placement details ................................... 11

4Component description............................................................................12

4.1 S2-LP Radio ................................................................................................ 12

4.2 SPI EEPROM .............................................................................................. 12

5Formal Notices Required by the U.S. Federal Communications

Commission (“FCC”).................................................................................................13

6Formal Notices Required by the Industry Canada (“IC”) ......................14

7OEM Integration Instructions...................................................................16

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1 Description

The X-NUCLEO-S2915A1 boards contain the S2-LP radio which is a high

performance ultra-low power, sub-1 GHz, RF transceiver.

Table 1. Expansion board details

Evaluation board

communication

frequency

Description

X-NUCLEO-S2868A1

868 MHz

868 MHz RF expansion board based on S2-LP RF

transceiver.

X-NUCLEO-S2915A1

915 MHz

915 MHz RF expansion board based S2-LP RF

transceiver

1.1 Typical applications

The evaluation boards can be used for evaluation of the S2-LP device in

multiple applications.

The following demo examples are available for testing with the evaluation

boards

• wM-Bus: Wireless Metering Bus demo

• Point-to-point communication protocol demo

• 6LoWPAN applications

• SigFox Communication

Please refer to the data brief for the firmware, available on www.st.com.

Users can develop other applications for evaluating the devices. Some of

these applications are:

• SigFox Communication

• Automatic meter reading

• Home and building automation

• WSN (wireless sensor network)

• Industrial monitoring and control

• Wireless fire and security alarm systems

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1.2 Abbreviations

Table 2. Abbreviation

Term

Meaning

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

Radio frequency communication

SPI

Serial peripheral interface

USB

Universal serial bus

wM-Bus

Wireless metering bus

WSN

Wireless sensors network

TBD

To Be Done

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2 Getting started

This section describes the hardware requirements for the X-NUCLEO-

S2915A1 evaluation boards.

2.1 Overview

The X-NUCLEO-S2915A1 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

• Modulation schemes: 2-FSK, 2-GFSK05,2-GFSK1, 4-FSK, 4-GFSK05

• Air data rate from 0.1 to 500 kbps

• Ultra-low power consumption: 7 mA RX and 10 mA TX

• 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 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-S2915A1 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

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• 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-S2915A1

expansion board, connect the boards as shown below.

Figure 2. X-NUCLEO-S2915A1 expansion board connected to an STM32 Nucleo development board

The interconnection between the STM32 Nucleo and the X-NUCLEO-

S2915A1 has been designed to allow using any STM32 Nucleo board,

although complete testing has been performed using NUCLEO-L053R8,

NUCLEOF401RE 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)

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• 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

Perform the following steps to set up the board:

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-S2915A1 to the STM32 Nucleo board as

shown in Figure 2. X-NUCLEOS2915A1 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

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3 Hardware description and configuration

This section describes the X-NUCLEO-S2915A1 features and provides

information which could be useful to understand the board schematics.

3.1 Interconnection details

The X-NUCLEO-S2915A1 expansion board and the NUCLEO-F401RE or

NUCLEO-L152RE board connection details are listed in the table below.

Table 3. Left connector connection details

Left connector

CN6 Power

CN8 Analog

GPIO0

CSN

GPIO1

GPIO2

GPIO0*

GPIO3

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Table 4. Right connector connection details

Right connector

CN5 Digital

CN9 Digital

SCL

SDA

GND

SPI_CLK*

SPI_MISO

SPI_MOSI

SPI_CSN*

nS*

SDN

SDN*

SPI_CLK

Note: * = 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.

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Table 5. S2-LP interface (optional) with Nucleo board

S2-LP signal

Default STM32

port

Optional STM32 port

CSn

PA1

PB6

To use optional connection mount R9, demount R13

CLK

PB3

PA5

To use optional connection mount R6, demount R11

PB4

PA9

To use optional connection mount R7, demount R19

SDN

PA8

PB10

To use optional connection mount R18, demount R10

To use the optional connections, modify the firmware on the basis of the

STM32 resources used.

SKY66420 power amplifier setting:

SW1

SW2

LNA ON

soldered a 100 pF cap between 1 – 2

soldered a 100 pF cap between 1 - 3

LNA OFF

soldered a 100 pF cap between 1 - 3

soldered a 100 pF cap between 1 - 2

SKY66420

signal

Default STM32 port

Optional STM32 port

GPIO0

PA0

PC1

To use optional connection mount R25,

demount R12

GPIO1

PA4

GPIO2

PB0

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