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STMicroelectronics S2-LP

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STMicroelectronics S2-LP - ultra-low power, high performance, 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.

The S2-LP 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.

The S2-LP can be used in systems with channel spacing of 12.5/25 kHz enabling the narrow band operations.

The S2-LP shows an RF link budget higher than 140 dB for long communication ranges and meets the regulatory requirements applicable in territories worldwide, including Europe, Japan, China and the USA.

Key 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
       

STEVAL-FKI868V1 - sub-1GHz transceiver development kit based on S2-LP

STEVAL-FKI868V1 evaluation boardThe 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
STMicroelectronics S2-LP product image