Ultra-Low Power, High Performance Sub-1GHz Transmitter


  • Output Power: +16 dBm
  • Tx Peak Current: 10 mA at +10 dBm
  • Pin-to-Pin Compatible with S2-LP Transceiver
  • Operating Temperature Range from -40 to 105 °C

The S2-LPTX is a high-performance ultra-low-power RF transmitter, 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 413-479 MHz, 826-958 MH.

The S2-LPTX supports different modulation schemes: 2(G)FSK, 4(G)FSK, OOK and ASK. The air data rate is programmable from 0.1 to 500 kbps.

The S2-LPTX meets the regulatory requirements applicable in territories worldwide, including Europe, Japan, China, and the USA.

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  • Frequency bands:
    • 413-479 MHz
    • 826-958 MHz
    • Modulation schemes:
    • 2(G)FSK, 4(G)FSK
    • OOK, ASK
  • Air data rate:
    • From 0.1 to 500 kbps
  • Ultra-low power consumption:
    • 10 mA TX at +10 dBm
  • Programmable RF output power up to +16 dBm
  • Programmable channel spacing
  • Fast start-up and frequency synthesizer settling time
  • Battery indicator and low battery detector
  • TX 128 bytes FIFO buffers
  • 4-wire SPI interface
  • ST companion integrated filter chips are available
  • Fully integrated ultra-low power RC oscillator
  • Wake-up feature, driven by an internal timer or external event
  • Flexible packet length with a dynamic payload length
  • IEEE 802.15.4g hardware packet support with whitening, FEC, CRC
  • Wireless M-BUS supported
  • Enables operations in the SIGFOX™ network
  • Suitable to build systems targeting:
    • Europe: ETSI EN 300 220, ETSI EN 303 131
  • Operating Temperature Range from -40 to 105 °C
  • Sensors to Cloud
  • Smart Metering
  • Home Energy Management Systems
  • Wireless Alarm Systems
  • Smart Home
  • Building Automation
  • Industrial Monitoring and Control
  • Smart Lighting Systems
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