Ultra-low-power features of STM32WL Series microcontrollers

PublishTime：2021-11-10

The STM32WL Series microcontrollers are long-range wireless and ultra-low-power devices (named STM32WL devices in this document) and embed a powerful and ultra-low-power LPWAN-compliant radio solution. These devices are designed to be extremely low-power and are based on the high-performance Arm® Cortex®‑M4 32-bit RISC core that operates at a frequency of up to 48 MHz. It is complemented by an Arm® Cortex®‑M0+.
The STM32WL devices feature a flexible management of the power modes, allowing the overall application consumption to be reduced.
A large number of smart and high-performance peripherals, a large set of advanced and low-power analog features, and several peripherals tuned for low-power modes are embedded. By using the batch acquisition mode (BAM), these peripherals optimize the power consumption when data is transferred using the communication peripherals, while the rest of the device is kept in low-power mode.
The STM32WL devices enable an easy migration from a dual-chip solution (such as STM32L4 Series MCU + LoRa® / sub‑GHz module), to a single chip, with a better power budget.
An embedded SMPS improves the power consumption in the applications, as well as the overall consumption for the sub‑GHz radio communications.
Thanks to the built-in internal voltage regulator and voltage scaling, the device consumption in active modes is kept at a minimum, whatever the external supply voltage. This makes the STM32WL devices particularly suited for hand-held
battery‑powered products, down to 1.8 V. In addition, multi-voltage domains supply the devices at low voltage (further reducing
consumption), while the analog-to-digital converters operate with a higher supply and reference voltage, up to 3.6 V.
The STM32WL devices support a battery Backup domain to keep the RTC running, and a set of 20 registers (32-bit wide), that can be retained in case of power loss. This optional backup battery can be charged when the main supply is present.
The various supported low-power modes allow the user to achieve the best compromise between low-power consumption, shorter start-up time, available set of peripherals and maximum number of wakeup sources.

Brand of Product：	ST
Part#：	STM32WL Series 、 STM32WL More Part#
Product Category：	microcontrollers More
Application：	More
Data Type：	Application note & Design Guide More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	4-May-2021
Version Number：	Rev 2
Data Encoding：	AN5568
Data Size：	393 KB

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