STMicroelectronics S2-LP low power sub-1GHz transceiver

The S2-LP is a high performance ultra-low power RF transceiver, intended for RF wireless applications in the sub-1 GHz band.It is designed to operate in both the license-free ISM and SRD frequency bands at 433, 868 and 920 MHz, but can also be programmed to operate at other additional frequencies in the 430-470 MHz, 860-940 MHz bands. It supports different modulation schemes: 2(G)FSK, 4(G)FSK, OOK and ASK. The air data rate is programmable from 0.3 to 500 kbps and can be used in systems with channel spacing of 12.5/25 kHz enabling the narrow band operations.

Key features

• Receiver sensitivity: down to -130 dBm
• Programmable RF output power up to +16 dBm
• Ultra-low power consumptio
• Programmable RX digital filter
   

Additional features

• Frequency bands:
  • 430-470 MHz
  • 860-940 MHz
• Modulation schemes:
  • 2(G)FSK, 4(G)FSK
  • OOK, ASK
• Air data rate from 0.3 to 500 kbps
• Ultra-low power consumption:
  • 7 mA RX
  • 10 mA TX @ +10 dBm
• Excellent performance of receiver sensitivity: down to -130 dBm
• Excellent receiver selectivity and blocking
• Programmable RF output power up to +16 dBm
• Bit rate from 0.3 to 500 kbps
• Programmable RX digital filter
• Programmable channel spacing
• Fast startup and frequency synthesizer settling time
• Automatic frequency offset compensation, AGC and symbol timing recovery
• More than 140 dB RF link budget
• Battery indicator and low battery detector
• RX and TX FIFO buffers
• 4 wires SPI interface
• Automatic packet acknowledgment and retransmission
• Embedded timeout protocol engine
• Antenna diversity algorithm
• Fully integrated ultra-low power RC oscillator
• Wake-up driven by internal timer or external event
• Digital real time RSSI
• Flexible packet length with dynamic payload length
• Programmable preamble and SYNC word quality filtering and detection
• Embedded CSMA/CA engine based on listen-before-talk systems
• IEEE 802.15.4g hardware packet support with whitening, FEC, CRC and dual SYNC word detection
• Wireless M-BUS supported
• Enables operations in the SIGFOX™ networks
• Suitable to build systems targeting:
  • Europe: ETSI EN 300 220, ETSI EN 303 131
  • US: FCC part 15 and part 90
  • Japan: ARIB STD T67, T108
  • China: SRRC
• Operating temperature range -40 °C to +85 °C
   

Key applications

• Sensors to Cloud
• Smart metering
• Home energy management systems
• Wireless alarm systems
• Smart home
• Building automation
• Industrial monitoring and control
• Smart lighting system

Evaluation Board 

The STEVAL-FKI868V1 evaluation board is based on the S2-LP sub-1 GHz ultra-low power low data-rate transceiver, suitable for ISM bands and Wireless M-Bus.

The main board is the NUCLEO-L152RE development board, equipped with a low power microcontroller STM32L to control the S2-LP and the ST-LINK/V2-1 debugger and programmer for firmware updating.

Key Features:

• S2-LP narrow band ultra-low power sub-1 GHz transceiver in a standalone RF Module tuned for 860 - 940 MHz frequency bands
• STM32 Nucleo development board with STM32L152RE MCU
• Suitable for Wireless M-Bus systems
• Associated S2-LP development kit including, documentation, firmware for STM32L and GUI
• 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 0.3 to 500 kbps
• Ultra-low power consumption:6.7 mA RX
• 10 mA TX at +10 dBm
• Excellent performance of receiver sensitivity (up to -130 dBm)
• Low duty cycle RX / TX operation mode
• Automatic acknowledgement, retransmission, and timeout protocol engine
• SPI interface for microcontroller
• USB interface
• RoHS compliant