Low-power, narrow-band, long-range RF IC adds Sigfox mode

November 16, 2016 // By Graham Prophet
STMicroelectronics highlights the energy efficiency of its latest transceiver IC, enabling IoT applications to run for up to 10 years without battery changes. The ultra-low power design has built-in support for Sigfox, as well as for multiple protocols and multiple sub-1GHz Industrial, Scientific and Medical (ISM) frequency bands.


The S2-LP transceiver;

- Supports point-to-point, star, as well as mesh networking topologies thus resulting in a very flexible wireless transceiver for connected objects.

- Delivers low power consumption, drawing 6.7 mA in receive mode, and 10 mA when transmitting at 10 dBm. Sleep and standby modes reduce the current to 600 nA and 350 nA, respectively.

- Receiver sensitivity of -130 dBm enables operation over distances up to several hundred kilometers, depending on the environment, thus enabling wide-area coverage.

- Is a flexible solution that can be programmed for operation in multiple worldwide sub-1GHz ISM frequency band: support for Sigfox, Wireless M-Bus and 6LowPAN, as well as IEEE 802.15.4g, which is suitable for home energy-management systems.

The IC has a Software Development Kit (SDK) compatible with the STM32 microcontroller family, and makes use of STM32 prototype boards, software tools and resources.

The device is Sigfox-ready and comes with a pre-certified Development Kit enabling immediate connectivity to the Sigfox network for evaluation and easy prototyping purposes.


The S2-LP transceiver is intended for networked devices, such as alarm systems, surveillance equipment and smart energy-metering solutions, as well as long-range radio links used to connect devices such as remote sensors directly to the Cloud without a local gateway. Other applications include building automation, industrial monitoring and control, and systems for managing lighting, traffic, or parking in smart cities.


The device operates in unlicensed sub-1GHz frequency bands, which are available globally. Ultra-narrowband operation allows highly efficient use of radio spectrum and reliable data exchange up to long distances using low-power signals.


“... in 2009 we saw the coming need to support emerging IoT applications with a low-power ISM radio for medium-long-range wireless connections and we developed and introduced our own SPIRIT1 low-power sub-1GHz radio that is currently in many applications available in the market,” said Benedetto Vigna, Executive Vice President, General Manager, Analog and MEMS Group, STMicroelectronics. “Now, in