X-NUCLEO-S2868A1 Data brief Sub-1 GHz 868 MHz RF expansion board based on S2-LP radio for STM32 Nucleo Features * * * * * * * * * * * * * * * * * * * Product summary Sub-1 GHz RF expansion board based on S2-LP radio for STM32 Nucleo X-NUCLEO-S2868A1 Ultra-low power, high performance, sub-1 GHz transceiver S2-LP 50 nominal input/conjugate match balun to S2-LP, 868-930 MHz with integrated harmonics filter BALF-SPI2-01D3 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 Description 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. DB3602 - Rev 1 - May 2018 For further information contact your local STMicroelectronics sales office. www.st.com X-NUCLEO-S2868A1 X-NUCLEO-S2868A1 schematic diagram 1 X-NUCLEO-S2868A1 schematic diagram Figure 1. X-NUCLEO-S2868A1 circuit schematic VDD VDD VDD VDDSMPS C2 C1 C_4.7U_0603 VDDVCOTX C4 C_150n_0402 VDD VDDRXDIG VDDANASYNTH C6 C5 C_150n_0402 C_100p_0402 +3V3 C8 C_100p_0402 C_100p_0402 VRSYNTH R2 R_100k_040 R1 C30 C_150n_0402 R_100k_0402 U1 nS SDO GPIO1 1 nS VCC 8 2 Q nHOLD 7 3 nW C 6 SCLK VSS D 5 SDI 4 CSN GPIO2 GPIO3 C_150n_0402 GPIO0 C10 C9 C_100n_0402 R3 19 CSN 21 20 24 22 15 RXP 14 A1 RX_P GND1 13 B1 RX_N ANT B2 C1 TX C2 R37 0R U3 25 12 A2 GND2 C16 100pF J1 C17 NM L11 BALF-SPI2-01D3 SMA ANT ENNA NM VDDVCOTX R24 10R C25 L12 NM C22 C_150n_0402 L13 NM C_470p_0402 C36 CRYST AL_NX1612SA VDDRXDIG GND VRRF RXN TX SDN VDDVCOTX XOUT XIN 10 6 11 5 VREFVCO 4 IN IN 1 GPIO0 GPIO1 GPIO3 GPIO2 VDDRXDIG OUT SCLK 2 4 SDO SDO VRSYNTH C14 SDI SDI SMPS2 VDDANASYNTH C_12pF_0603 SCLK 17 SMPS1 SDN Y1 3 18 16 VDDSMPS 2 S2-LP OUT R_100k_0402 1 3 VDDANASYNTH L_10U_0805 VRSYNTH 0R 9 VDDSMPS L2 VSMPS2 7 R33 1. 4 V t o 1. 8 V max 8 C_150n_0402 C_1u_0603 VRDIG C12 23 M95640 U2 C32 L7 C13 100pF VSMPS2 E1 L_12nH_0603 10pF C35 C34 C_150n_0402 C_100p_0402 AM11DG-ST 01 NM L8 4.7nH U4 R38 +3V3 2.2K +3V3 C42 10uF 1 RESET 2 VCC 3 C41 4 100nF NC NC SCL NC GND SDA 8 7 SCL 6 5 SDA R36 2.2K R35 2.2K ST SAFE-A100 NM +3V3 +3V3 Figure 2. X-NUCLEO-S2868A1 circuit schematic - Arduino connectors ARDUINO UNO R3 DX connector ARDUINO UNO R3 SX connector CN6 NC IOREF RESET 3V3 5V GND GND VIN 1 2 3 4 5 6 7 8 IOREF RESET +3V3 VDD JP1 1 +5V CN5 SCL SDA AVDD SCLK SDO SDI CSN PC7 nS 2 JUMPER VIN R6 R4 R5 R9 R17 R7 NM 0 0 NM NM NM 8 pass-through: male on bottom and female on top Pass-through: male on bottom and female on top CN8 A0 A1 A2 A3 A4 A5 1 2 3 4 5 6 6 pass-through: male on bottom and female on top DB3602 - Rev 1 SCL SDA AREF GND SCK/D13 MISO/D12 MOSI/PWM/D11 PWM/D10 PWM/D9 D8 10 9 8 7 6 5 4 3 2 1 R12 R13 R14 R15 R18 R16 0 0 0 0 NM 0 SDN SDN nS GPIO0 CSN GPIO1 GPIO2 GPIO0 GPIO3 SCLK PC7 D11 R23 330 LED CN9 R10 R19 R22 0 NM 0 R11 0 PA2 PA3 8 7 6 5 4 3 2 1 D7 D6 D5 D4 D3 D2 TXD/D1 RXD/D0 Pass-through: male on bottom and female on top page 2/5 X-NUCLEO-S2868A1 X-NUCLEO-S2868A1 schematic diagram Figure 3. X-NUCLEO-S2868A1 circuit schematic - morpho connectors ST morpho SX connector ST morpho DX connector CN7 PC10 PC12 VDD BOOT0 NC/PF6 NC/PF7 PA13 PA14 PA15 PB7 PC13 PC14 PC15 PH0/PF0/PD0 PH1/PF1/PD1 VLCD/VBAT PC2 PC3 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 Pass-through: female on bottom and male on top DB3602 - Rev 1 CN10 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 PC11 PD2 E5V PC9 PB8 PB9 AVDD IOREF RESET +3V3 +5V PA5 PA6 PA7 PB6 PC7 PA9 PA8 PB10 PB4 PB5 PB3 PA10 PA2 PA3 VIN PA0 PA1 PA4 PB0 PC1 PC0 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 PC8 PC6 PC5 U5V PD8 PA12 PA11 PB12 PB11/NC VDD PB2 PB1 PB15 PB14 PB13 AGND PC4 NC/PF5 NC/PF4 Pass-through: female on bottom and male on top page 3/5 X-NUCLEO-S2868A1 Revision history Table 1. Document revision history DB3602 - Rev 1 Date Version 11-May-2018 1 Changes Initial release. page 4/5 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. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers' products. No license, express or implied, to any intellectual property right is granted by ST herein. Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product. ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners. Information in this document supersedes and replaces information previously supplied in any prior versions of this document. (c) 2018 STMicroelectronics - All rights reserved DB3602 - Rev 1 page 5/5