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New STM32 System-on-Chip with Lora® Communication for IoT Smart Devices


The STM32WLE5 integrates a STM32 microcontroller IP and enhanced Semtech radio on one chip


Powering the search for sustainability through smart infrastructure and logistics, smart industry and smart living, STMicroelectronics has released the world’s first LoRa® system-on-chip (SoC) for connecting smart devices to the Internet of Things (IoT) using long-distance wireless connections.

Click for Larger Image - New STM32 System-on-Chip with Lora® Communication for IoT Smart Devices 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

The SoC combines ST’s proven skills in ultra-low-power STM32 microcontroller 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.

“Our new wireless STM32 SoC extends the existing STM32W Wireless and simplifies new-product development while saving bill-of-materials costs and maximizing system reliability and energy efficiency,” said Ricardo De Sa Earp, Microcontroller Division General Manager, STMicroelectronics. “In addition, by leveraging the STM32 MCU architecture, we let developers easily introduce wireless connectivity in existing embedded designs by porting to the STM32WLE5.”

Features of the STM32WLE5JC Arm® Cortex®-M4 Microcontroller include:

  • Radio
    • Frequency range: 150 MHz to 960 MHz
    • Modulation: LoRa®, (G)FSK, (G)MSK and BPSK
    • RX sensitivity: –125 dBm for 2-FSK(at 1.2 Kbit/s), –148 dBm for LoRa® (at 10.4 kHz, spreading factor 12)
    • Transmitter high output power, programmable up to +22 dBm
    • Transmitter low output power, programmable up to +15 dBm
  • Ultra-low-power platform
    • 1.8 V to 3.6 V power supply
    • Shutdown mode: 31 nA (VDD = 3 V)
    • Active-mode MCU: < 72 µA/MHz (CoreMark®)
    • Active-mode RX: 5.4 mA
    • Active-mode TX: 15 mA at 10 dBm and 87 mA at 20 dBm (LoRa® 125 kHz)
  • Core: 32-bit Arm®Cortex®-M4 CPU
  • Security and identification
    • Hardware encryption AES 256-bit
    • True random number generator
    • Sector protection against read/write operations
    • CRC calculation unit
    • Unique device identifier
    • Hardware public key accelerator
  • Supply and reset management
    • High-efficiency embedded SMPS step down converter
    • SMPS to LDO smart switch
    • Ultra-safe, low-power Brownout reset
    • VBAT mode with RTC and 20x32-byte backup registers
  • Memories
    • Up to 256-Kbyte Flash memory
    • Up to 64-Kbyte RAM
    • 20x32-bit backup register
    • Bootloader supporting USART and SPI interfaces
  • Rich analog peripherals (down to 1.65 V)
    • 12-bit ADC 2.5 Msps, up to 16-bit with hardware oversampling, conversion range 0 to 3.6 V
    • 12-bit DAC, low-power sample-and-hold
    • 2x ultra-low-power comparators
  • Controllers
    • 2x DMA controller (7 channels each) supporting ADC, DAC, SPI, I2C, LPUART, USART, AES and timers
    • 2x USART (ISO 7816, IrDA, SPI)
    • 1x LPUART (low-power)
    • 2x SPI 16 Mbit/s (1 over 2 supporting I2S)
    • 3x I2C (SMBus/PMBus™)
    • 2x 16-bit 1 channel timer
    • 1x 16-bit 4 channels timer (supporting motor control)
    • 1x 32-bit 4 channels timer
    • 3x 16-bit ultra-low-power timer
    • 1x RTC with 32-bit sub-second wakeup counter
    • 1x independent SysTick
    • 1x independent watchdog
    • 1x window watchdog
  • Up to 43 I/Os, most 5 V-tolerant

More information on the STM32WLE5 multi-modulation wireless microcontrollers is available on the ST Web site at STMicroelectronics STM32WL series page.

STM32 are registered and/or unregistered trademarks of STMicroelectronics International NV or its affiliates in the EU and/or elsewhere. In particular, STM32 is registered in the US Patent and Trademark Office.


The company's Web site address is www.st.com.
[Reprinted with kind permission from STMicroelectronics - Release Date, 7th January, 2020]