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Sub-GHz Wireless Microcontrollers. Arm Cortex-M4 @48 MHz with 64 Kbytes of Flash memory, 20 Kbytes of SRAM. LoRa, (G)FSK, (G)MSK, BPSK modulations. AES 256-bit. Multiprotocol System-on-Chip.

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Product overview


The STM32WLE5/E4xx long-range wireless and ultra-low-power devices embed a powerful and ultra-low-power LPWAN-compliant radio solution, enabling the following modulations: LoRa®, (G)FSK, (G)MSK, and BPSK.

The LoRa® modulation is available in STM32WLx5xx only.

These devices are designed to be extremely low-power and are based on the high-performance Arm® Cortex®-M4 32-bit RISC core operating at a frequency of up to 48 MHz. This core implements a full set of DSP instructions and an independent memory protection unit (MPU) that enhances the application security.

The devices embed high-speed memories (flash memory up to 256 Kbytes, SRAM up to 64 Kbytes), and an extensive range of enhanced I/Os and peripherals.

The devices also embed several protection mechanisms for embedded flash memory and SRAM: readout protection, write protection and proprietary code readout protection.

These devices offer a 12-bit ADC, a 12-bit DAC low-power sample-and-hold, two ultra-low-power comparators associated with a high-accuracy reference voltage generator.

The devices embed a low-power RTC with a 32-bit sub-second wakeup counter, one 16-bit single-channel timer, two 16-bit four-channel timers (supporting motor control), one 32-bit four-channel timer and three 16-bit ultra-low-power timers.

These devices also embed two DMA controllers (7 channels each) allowing any transfer combination between memory (flash memory, SRAM1 and SRAM2) and peripheral, using the DMAMUX1 for flexible DMA channel mapping.

The devices also feature the following standard and advanced communication interfaces:two USARTs (supporting LIN, smartcard, IrDA, modem control and ISO7816), one low-power UART (LPUART), three I2Cs (SMBus/PMBus), two SPIs (up to 16 MHz, one supporting I2S), semaphores for processor firmware process synchronization.

The operating temperature/voltage ranges are –40 °C to +105 °C (+85 °C with radio) from a 1.8 V to 3.6 V power supply. A comprehensive set of power-saving modes allows the design of low-power applications.

The devices integrate a high-efficiency SMPS step-down converter and independent power supplies for ADC, DAC and comparator analog inputs.

A VBAT dedicated supply allows the LSE 32.768 kHz oscillator, the RTC and the backup registers to be backed up. The devices can maintain these functions even if the main VDD is not present, through a CR2032-like battery, a supercap or a small rechargeable battery.

  • All features

    • Includes ST state-of-the-art patented technology
    • Radio
      • Frequency range: 150 MHz to 960 MHz
      • Modulation: LoRa®, (G)FSK, (G)MSK and BPSK
      • RX sensitivity: –123 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
      • Available integrated passive device (IPD) companion chips for optimized matching, filtering and balun, all in one very compact solution covering each package and each main use cases (22 dBm @ 915 MHz, 14 dBm @ 868 MHz, 17 dBm @ 490 MHz)
      • Compliant with the following radio frequency regulations such as ETSI EN 300 220, EN 300 113, EN 301 166, FCC CFR 47 Part 15, 24, 90, and the Japanese ARIB STD-T30, T-67, T-108
      • Compatible with standardized or proprietary protocols such as LoRaWAN®, Sigfox™, W-MBus and more (fully open wireless system-on-chip)
    • Ultra-low-power platform
      • 1.8 V to 3.6 V power supply
      • –40 °C to +105 °C temperature range
      • Shutdown mode: 31 nA (VDD = 3 V)
      • Standby (+ RTC) mode:360 nA (VDD = 3 V)
      • Stop2 (+ RTC) mode: 1.07 µA (VDD = 3 V)
      • Active-mode MCU: < 72 µA/MHz (CoreMark®)
      • Active-mode RX: 4.82 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
        • Adaptive real-time accelerator (ART Accelerator) allowing 0-wait-state execution from flash memory, frequency up to 48 MHz, MPU and DSP instructions
        • 1.25 DMIPS/MHz (Dhrystone 2.1)
    • Security and identification
      • Hardware encryption AES 256-bit
      • True random number generator (RNG)
      • Sector protection against read/write operations (PCROP, RDP, WRP)
      • CRC calculation unit
      • Unique device identifier (64-bit UID compliant with IEEE 802-2001 standard)
      • 96-bit unique die identifier
      • Hardware public key accelerator (PKA)
    • Supply and reset management
      • High-efficiency embedded SMPS step-down converter
      • SMPS to LDO smart switch
      • Ultra-safe, low-power BOR (brownout reset) with 5 selectable thresholds
      • Ultra-low-power POR/PDR
      • Programmable voltage detector (PVD)
      • VBAT mode with RTC and 20x32-bit backup registers
    • Clock sources
      • 32 MHz crystal oscillator
      • TCXO support: programmable supply voltage
      • 32 kHz oscillator for RTC with calibration
      • High-speed internal 16 MHz factory trimmed RC (± 1 %)
      • Internal low-power 32 kHz RC
      • Internal multi-speed low-power 100 kHz to 48 MHz RC
      • PLL for CPU, ADC and audio clocks
    • Memories
      • Up to 256-Kbyte flash memory
      • Up to 64-Kbyte RAM
      • 20x32-bit backup register
      • Bootloader supporting USART and SPI interfaces
      • OTA (over-the-air) firmware update capable
      • Sector protection against read/write operations
    • Rich analog peripherals (down to 1.62 V)
      • 12-bit ADC 2.5 Msps, up to 16 bits with hardware oversampling, conversion range up to 3.6 V
      • 12-bit DAC, low-power sample-and-hold
      • 2x ultra-low-power comparators
    • System peripherals
      • Semaphores for processor firmware process synchronization
    • 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-channel timer (supporting motor control)
      • 1x 32-bit 4-channel 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
    • Development support
      • Serial-wire debug (SWD), JTAG
    • All packages ECOPACK2 compliant

Circuit Diagram

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