The STM32WLE5/E4xx long-range wireless and ultra-low-power devices provide a powerful and ultra-low-power LPWAN radio solution that supports the following modulations: LoRa®, (G)FSK, (G)MSK, and BPSK. The LoRa® modulation is only accessible on the STM32WLx5xx.
These devices are designed to be exceptionally low-power and are based on the high-performance Arm® Cortex®-M4 32-bit RISC core, which operates at up to 48 MHz. This core implements a complete range of DSP instructions, as well as an independent memory protection unit (MPU), which improves application security.
The devices include high-speed storage (flash memory up to 256 Kbytes, SRAM up to 64 Kbytes), as well as a wide range of upgraded I/Os and peripherals. The devices also provide many protective techniques for embedded flash memory and SRAM, including readout protection, write protection, and proprietary code readout protection. These devices include a 12-bit ADC, a 12-bit DAC, two ultra-low-power comparators, and a high-accuracy reference voltage generator.
The devices include a low-power RTC with a 32-bit sub-second wakeup counter, one 16-bit single-channel timer, two 16-bit four-channel timers (motor control compatible), one 32-bit four-channel timer, and three 16-bit ultra-low-power timers. These devices additionally include two DMA controllers (7 channels each), enabling for any transfer combination between memory (flash memory, SRAM1, and SRAM2) and peripherals, with the DMAMUX1 providing variable DMA channel mapping.
The devices also have 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 with I2S support), and semaphores for processor firmware process synchronization.
The operational temperature/voltage range is -40 °C to +105 °C (+85 °C with radio) with a power supply ranging from 1.8 to 3.6 V. A complete collection of power-saving settings enables the development of low-power applications. The devices include a high-efficiency SMPS step-down converter and independent power supply for the ADC, DAC, and comparator analog inputs. A VBAT dedicated supply allows you to backup the LSE 32.768 kHz oscillator, the RTC, and the backup registers. The devices can continue to function even when the main VDD is not present, thanks to a CR2032-like battery, a supercap, or a small rechargeable battery.
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