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STM32 SoC Speeds LoRa IoT Smart Device Designs

STMicroelectronics has released what it claims is the first LoRa system-on-chip (SoC) for connecting smart devices to the IoT using long-distance wireless connections. The STM32WLE5 SoC lets product developers create devices such as remote environmental sensors, meters, trackers and process controllers that help efficiently manage energy and resources, says ST.

The SoC combines the ultra-low-power STM32 MCU design with a LoRa-compliant radio in one single-die and easy-to-use device. With multiple ST patents pending, namely for radio Power Management Architecture, the STM32WLE5 will ensure unique performance. ST’s LoRaWAN software for wireless network communications has passed all regional certifications for use worldwide.

STM32WLE5 users are supported by ST’s rolling 10-year longevity commitment for industrial products. The STM32WLE5 is available in a 5mm x 5mm UFBGA73 package. It is fully integrated into the market-proven STM32 ecosystem, including STM32Cube software support, as well as a LoRaWAN stack certified for all regions and available in source-code format.

The integrated radio based on Semtech SX126x IP is engineered with dual high-power and low-power transmitter modes that cover the entire global sub-1GHz unlicensed frequency range from 150MHz to 960MHz, ensuring compatibility with LoRa networks in all territories. Hence, OEMs can use STM32WLE5 for all world markets, ensuring technical compatibility, and aiding operational efficiency and customer support. Sensitivity down to -148dBm, and two embedded power amplifiers with up to 15dBm and up to 22dBm maximum transmit power available in the same package, maximize RF range.

In addition to the embedded LoRa modulation, the STM32WLE5 is also capable of (G)FSK, (G)MSK, and BPSK modulation thus allowing various alternative protocols including proprietary protocols. Moreover, high RF performance with low power consumption ensures reliable wireless connectivity and extends the runtime of battery-powered devices.

The MCU leverages ST’s STM32L4 architecture, which features the Arm Cortex-M4 core with DSP extensions and brings ultra-low-power technologies including dynamic voltage scaling and ST’s adaptive real-time ART Accelerator for zero-wait execution from flash. Generous 64KB, 128KB and 256KB flash options let developers choose the optimal code and data storage density for the entire platform including application and radio.

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Users also benefit from the built-in cyber-security features of STM32L4 MCUs, including hardware public key accelerator (PKA), True Random Number Generator (TRNG), sector protection against read/write operation (PCROP), and support for state-of-the-art cryptographic algorithms including RSA.

STMicroelectronics | www.st.com


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