Sub-1 GHz 868 MHz RF expansion board based on S2-LP radio




The X-NUCLEO-S2868A1/X-NUCLEO-S2868A2 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/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.

Key Features

  • 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

Further information and ordering

X-NUCLEO-S2868A2 can be purchased directly from ST web site.
The page provides additional documents like a user manual, a quick start guide, schematics, gerber files and bill of materials.
Additional SW and tools are also provided.

Mbed OS support

The board is supported by Mbed OS 5 and can be used together with the Mbed OS Nanostack and Wi-SUN network. In particular it is supported by the Mbed OS mesh minimal example and the S2-LP radio driver.

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