User manual Getting started with the X-NUCLEO-S2915A1 Sub-1 GHz 915 MHz RF expansion board based on S2-LP radio for STM32 Nucleo 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.
User Manual Contents 1 2 3 4 Description ..................................................................................................3 1.1 Typical applications ....................................................................................... 3 1.2 Abbreviations ................................................................................................. 4 Getting started ............................................................................................5 2.1 Overview .....
Getting started X-NUCLEO-S2868A1 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 RF Evaluation board communication frequency 1.1 Description X-NUCLEO-S2868A1 868 MHz 868 MHz RF expansion board based on S2-LP RF transceiver.
User Manual 1.2 Abbreviations Table 2.
Getting started X-NUCLEO-S2868A1 2 Getting started This section describes the hardware requirements for the X-NUCLEOS2915A1 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.
User Manual • • • • • 2.2 Automatic meter reading Home and building automation WSN Industrial monitoring and control Wireless fire and security alarm systems 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.
Getting started X-NUCLEO-S2868A1 • • • • 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.
User Manual 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.
Getting started X-NUCLEO-S2868A1 Table 4. Right connector connection details Right connector SPI_MOSI SPI_CSN* 2 1 8 7 6 5 4 3 2 1 SPI_CLK 3 nS 4 SDN* 5 SDN 6 nS* 7 SPI_MISO SDA 8 SPI_CLK* 9 CN9 Digital GND 10 SCL CN5 Digital 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.
User Manual 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 nS 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.
Getting started X-NUCLEO-S2868A1 3.3 Current measurement To monitor the power consumption of the entire S2-LP X-NUCLEO-S2915A1 board, jumper J1 can be used. Connect an ammeter probe between pins 1 and 2 of the connector for measurements. 3.4 X-NUCLEO-S2915A1 component placement details Figure 3 shows the component placement on the S2-LP expansion XNUCLEO-S2915A1 board. Figure 3.
User Manual 4 Component description This section describes the devices on the board. 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. Table 7. S2-LP details Features Description Order code S2-LPQTR Package QFN24 4x4x1 Operating voltage 1.8 to 3.6 V S2-LP narrow band ultra-low power sub-1 GHz transceiver is tuned for 902~928 MHz, frequency bands 4.
Getting started X-NUCLEO-S2868A1 5 Formal Notices Required by the U.S. Federal Communications Commission (“FCC”) (TBD) 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.
User Manual 6 Formal Notices 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.
Getting started X-NUCLEO-S2868A1 This radio transmitter 8976C-S2915A1 has been approved by Innovation, Science and Economic Development Canada to operate with the antenna types listed below, with the maximum permissible gain indicated. Antenna types not included in this list that have a gain greater than the maximum gain indicated for any type listed are strictly prohibited for use with this device.
User Manual 7 OEM Integration Instructions. This device is intended only for OEM integrators under the following conditions： The LMA (Limited Modular Approval) is applied to this module because of below two concerns: 1. 2. There is no shied case, so the shielding policy is not complied with. The standard antenna connector is used for this module. To comply with FCC15.212 requirement, when this module is installed into the host, the OEM integrator must ensure: 1. 2.
Getting started X-NUCLEO-S2868A1 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.
