S2-LP is a narrowband 433/868 MHz transceiver. Free Technical Library News

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S2-LP - 433/868 MHz narrowband transceiver

11.03.2017

S2-LP is a new 433/868 MHz transceiver from STMicroelectronics, designed to create cost-sensitive IoT devices, but at the same time with high requirements for radio communication quality and consumption.

To what extent this was done can be assessed by looking at the impressive technical characteristics of the new microcircuit. The receiver sensitivity starts from -130 dBm, while the developer can work with a path bandwidth from one kilohertz. The output power is adjustable over a wide range - from -30 dBm to +16 dBm in 1 dBm steps. Thanks to the new class E amplifier, the current consumption at 10mW output power is only 10mA, while in receive mode the consumption is within 7mA. The microcircuit is the best in its class in terms of consumption in transmit mode.

Reducing the current draw of internal RF components often leads to reduced RF performance. However, the S2-LP transceiver performs well both in terms of link budget (> 140 dB RF link budget) and selectivity. Adjacent channel selectivity is 68 dB (@+-12.5 kHz), blocking is better than 80 dB at 2 MHz offset (@433 MHz)

The S2-LP transceiver can work with any external microcontroller. Control is performed in the most familiar way - via SPI with interrupts through customizable GPIO0 ... GPIO3 lines. To work with STM32 microcontrollers, there is a library and a set of examples for STM32Cube.

Features of the S2-LP transceiver:

Narrowband transceiver 430 - 470 / 860-940 MHz
Output power up to +-16 dBm; Sensitivity up to -130 dBm
Air data rate 0.3 - 500 kbps
Modulation types 2-FSK, 2-GFSK, 4-FSK, 4-GFSK, OOK, and ASK
Low consumption in active mode:
6,7mA RX
10mA TX @ +10dBm
Sleep Consumption 600nA (with timer)
Fast wakeup and fast synth setup time
Automatic retries and confirmations
Suitable for Wireless M-Bus systems; 802.15.4g
Case 4x4 mm QFN
Operating temperature -40...+85 °C

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