ST X-NUCLEO-S2915A1 User manual

Introduction

The X-NUCLEO-S2915A1 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.

Figure 1. X-NUCLEO-S2915A1 expansion board

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

board based on S2-LP radio for STM32 Nucleo

UM2641

User manual

UM2641 - Rev 1 - November 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

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Acronyms and abbreviations

UM2641 - Rev 1 page 2/20

2Getting started

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

• Programmable RF output power up to +27 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

• Sigfox compatible

• Sample firmware for P2P communication

• 6LoWPAN compatible thanks to STM32Cube

• FCC ID: S9NS2915A

• IC ID: 8976C-S2915A1

• RoHS and WEEE compliant

2.2 Typical applications

The X-NUCLEO-S2915A1 expansion board can be used for the evaluation of the S2-LP device in multiple

applications:

•wM-Bus application

• Point-to-point communication protocol

• 6LoWPAN applications

• SigFox communication

You can develop other applications for evaluating the devices, such as:

• Automatic meter reading

• Home and building automation

• WSN

• Industrial monitoring and control

• Wireless fire and security alarm systems

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Getting started

UM2641 - Rev 1 page 3/20

2.3 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, 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 protocol.

2.4 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-S2915A1 to the STM32 Nucleo 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.

The evaluation kit is ready-to-use.

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Hardware and software requirements

UM2641 - Rev 1 page 4/20

3Hardware description and configuration

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 2. X-NUCLEO-S2915A1 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

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-S2915A1 expansion board signals

3V3 GND GND GPIO0 CSN GPIO1 GPIO2 GPIO0(1) GPIO3

1. Optional connection.

Table 3. X-NUCLEO-S2915A1 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-S2915A1 expansion board signals

SCL SDA 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.

Table 4. S2-LP interface with STM32 Nucleo board

S2-LP signal Default STM32 port Optional STM32 port

CSn PA1 PB6

To use the optional connection, mount R9, unmount R13

UM2641

Hardware description and configuration

UM2641 - Rev 1 page 5/20

S2-LP signal Default STM32 port Optional STM32 port

CLK PB3 PA5

To use the optional connection, mount R6, unmount R11

nS PB4 PA9

To use the optional connection, mount R7, unmount R19

SDN PA8 PB10

To use the optional connection, mount R18, unmount R10

To use the optional connections, modify the firmware on the basis of the STM32 resources used.

Table 5. SKY66420 power amplifier settings

SKY66420 SW1 SW2

LNA ON (default) 100 pF capacitor between pin1 and pin2 (pin1 and

pin3 open)

100 pF capacitor between pin1 and pin3 (pin1 and

pin2 open)

LNA OFF 100 pF capacitor between pin1 and pin3 (pin1 and

pin2 open)

100 pF capacitor between pin1 and pin2 (pin1 and

pin3 open)

Table 6. SKY66420 interface with STM32 Nucleo board

SKY66420 signal Default STM32 port Optional STM32 port

GPIO0 PA0 PC1

To use optional connection mount R25, unmount R12

GPIO1 PA4 N.A.

GPIO2 PB0 N.A.

3.3 Current measurement

To monitor the X-NUCLEO-S2915A1 expansion board power consumption, use jumper J1: connect an ammeter

probe between the connector pins 1 and 2 for measurements.

3.4 X-NUCLEO-S2915A1 component placement details

The figure below shows the component placement on the X-NUCLEO-S2915A1 expansion board.

UM2641

Current measurement

UM2641 - Rev 1 page 6/20

Figure 3. X-NUCLEO-S2915A1 on-board device placement

1. Arduino UNO R3 left connector

2. Arduino UNO R3 right connector

3. S2-LP

4. SKY66420

UM2641

X-NUCLEO-S2915A1 component placement details

UM2641 - Rev 1 page 7/20

4X-NUCLEO-S2915A1 on-board device description

4.1 S2-LP radio

The X-NUCLEO-S2915A1 expansion board is based on the S2-LP standalone RF transceiver. It operates in the

915 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 7. S2-LP details

Features Description

Order code S2-LPQTR

Package QFN24 4x4x1

Operating voltage 1.8 to 3.6 V

4.2 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

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X-NUCLEO-S2915A1 on-board device description

UM2641 - Rev 1 page 8/20

5Schematic diagrams

Figure 4. X-NUCLEO-S2915A1 circuit schematic

C32

C_220n_0402

VDDRXDIG

GND

C16

R_100k_0402

C50

C_1p5_0402

CSN

OUT

GPIO2

+3V3

C37 2p4F

GPIO0

VRRF

L10

L_5n6H_0402

L_15nH_0402

C11

C_220n_0402

C34

C_3p3F_0402

SW1

GND

SKY66420

L_10U_0603

VCC0 15

SW2

C30

C_220n_0402

C47

C_100p_0402

C23 1.5pF

VDDVCOTX

C48

C_1p2_0402

C37 2p4F

C_100p_0402

C18

C24

C_100p_0402

C50

C_1p5_0402

C55 33pF

VDD

R44

2.2K

C61

C_220n_0402

SDN

VDDSMPS

GND

STSAFE-A100

L24 4n7H

L26

7n5H

C31

2p2F

R_100k_0402

C_100n_0402

L27 2n7H

C36

C_220n_0402

C17

100pF

R_100k_0402

C56 1nF

C44

C_2p7F_0402

C_100n_0402

SDA

L_4n7H_0402

VDD

1. 4 V t o 1. 8 V max

C61

ANT

SW2

L_39nH_0402

CPS

TX_ALT

L13

L_18nH_0402

C46

C_100p_0402

C12

C_1u_0402

L_6n8H_0402

C_100p_0402

C38

C51

C_100p_0402

GND

R_100k_0402

SDA

R45 2.2K

C58 120pF

C41

C_100p_0402

C55 33pF

LNA ON: SW1 soldered a 100 pF cap between 1 - 2

SW2 soldered a 100 pF cap between 1 - 3

LNA OFF: SW1 soldered a 100 pF cap between 1 - 3

SW2 soldered a 100 pF cap between 1 - 2

C60

R_100k_040

GPIO3

C40

12pF

GPIO0

GPIO3

C10

C_220n_0402

C43

C_1p5F_0402

AM11DG-ST01

L12

L_18nH_0402

VDDRXDIG

C_4.7U_0402

VDDANASYNTH

SMPS1

SKY66420

RX_FLT

C57

4u7F

R_100k_040

C_100p_0402

C52

100nF

L28

6n8H

L14

4.7nH

M95640

GND

C35

C_5p6F_0402

SDI

R45 2.2K

C25

C_470p_0402

C59 10nF

C54

10pF

CRYSTAL_NX1612SA

SDO

VCC

C_4.7U_0402

C16

C24

C_100p_0402

C32

C_220n_0402

C42

C36

C_220n_0402

RXN

VSS

VDDVCOTX

+3V3

L_39nH_0402

C25

C_470p_0402

C59 10nF

C62

C_100p_0402

L14

4.7nH

C_100p_0402

nHOLD

VRSYNTH

PA_OUT

XOUT

C57

4u7F

R20

R_10ohm_0402

VSMPS2

L24 4n7H

L11

L_27nH_0402

C_100p_0402

RESET

C_220nF_0402

C23 1.5pF

M95640

C53

10uF/0805

SCLK

C33

C42

SDO

C13

C_100p_0402

C41

C_100p_0402

L26

7n5H

L_6n8H_0402

GPIO1

C31

2p2F

L_10U_0603

SDI

C35

C_5p6F_0402

GPIO1

L10

L_5n6H_0402

C10

C_220n_0402

C62

C_100p_0402

VRSYNTH

VDDANASYNTH

R20

R_10ohm_0402

VCC

C11

C_220n_0402

C22

C_220n_0402

L25 4n7H

VRSYNTH

VDDSMPS

+3V3

C49

C_1p5_0402

L_4n7H_0402

C44

C_2p7F_0402

C56 1nF

VDD

AM11DG-ST01

C52

100nF

C48

C_1p2_0402

C34

C_3p3F_0402

C12

C_1u_0402

C_220nF_0402

L29

120ohm

L30

0n8H

C51

C_100p_0402

C30

C_220n_0402

C33

C_220n_0402

CTX

R44

2.2K

VRDIG

CSN

C58 120pF

C22

C_220n_0402

S2LP

C54

10pF

L27 2n7H

+3V3

RXP

VDD

VSMPS2

L13

L_18nH_0402

VDDVCOTX

C17

100pF

C39

C_12pF_0402

SMA ANTENNA

SW1

VREFVCO

C18

C_100p_0402

SMPS2

L_15nH_0402

CSD

C40

12pF

VCC1

C13

C_100p_0402

C_220n_0402

SCL

VDDRXDIG

L29

120ohm

SDO

SCLK

C_220n_0402

R43

2.2K

C60

C46

C_100p_0402

GPIO2

SCLK

VDDANASYNTH

SDI 17

L12

L_18nH_0402

C43

C_1p5F_0402

L30

0n8H

STSAFE-A100

OUT

L25 4n7H

C47

C_100p_0402

VDD

SDN

S2LP

C39

C_12pF_0402

C53

10uF/0805

C38

SCL

C_100p_0402

VDDSMPS

L28

6n8H

XIN

TX_IN

C49

C_1p5_0402

CRYSTAL_NX1612SA

SMA ANTENNA

L11

L_27nH_0402

+3V3

R43

2.2K

LNA_IN

UM2641 - Rev 1 page 9/20

UM2641

Schematic diagrams

Figure 5. X-NUCLEO-S2915A1 circuit schematic - Arduino connectors

CN9

CSN

CN5

SDA

GPIO3

PC7

+5V

3V3 4

A0 1

PWM/D10

IOREF

SCL

SDN

AREF

9SDA

R14

+3V3

PWM/D9

PA3

R13

SCL

CSN

R16

8 pass-through:

male on bottom

and female on top

GND

R18

GND

PA2

JUMPER

A4 5

SDI

5V 52SCK/D13

7GND

MOSI/PWM/D11

SDO

0PC7

RESET

R12

R15

NC 1

D11

Pass-through:

male on bottom

and female on top

ARDUINO UNO R3 SX connector

CN8

JP1

MISO/D12

RESET 2

R23

VDD

A3 4

RXD/D0

SCLK

R10

GPIO1

330

GPIO0

A2 3

TXD/D1

SCLK

SDN

VIN

GPIO0

LED

GPIO2

AVDD

IOREF

R11

R19

VIN

CN6

A1 2

ARDUINO UNO R3 DX connector

R17

Pass-through:

male on bottom

and female on top

R18

6 pass-through:

male on bottom

and female on top

Figure 6. X-NUCLEO-S2915A1 circuit schematic - ST morpho connectors

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 NC/PF4

NC/PF5

PC4

AGND

PB13

PB14

PB15

PB1

PB2

PC10

PC12

PB11/NC

VDD

BOOT0

PB12

NC/PF6

NC/PF7

PA11PA13

PA14

PA12

PA15

PD8

PB7

PC14

PC6

PC8

PC2

PC3

CN10

CN7

PH0/PF0/PD0

PH1/PF1/PD1

ST morpho SX connector

Pass-through:

female on bottom

and male on top

ST morpho DX connector

PC13

VDD

PC15

VLCD/VBAT

PC5

U5V

Pass-through:

female on bottom

and male on top

UM2641 - Rev 1 page 10/20

UM2641

Schematic diagrams

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