AN4365 datasheet(6/35 Pages) STMICROELECTRONICS

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STM32F4 power consumption

AN4365

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DocID025303 Rev 2

STM32F4 power consumption

Embedded system designers are currently facing an urgent need to make a trade-off

between power efficiency and high performance, especially with recent high-performance

microcontrollers such as the STM32F4 series. Low-power modes are implemented with

other features to reduce the average current consumption over the life of the application.

This part aims to describe the STM32F4 power modes and the power consumption of each

mode, and highlights the features that contribute in power consumption reduction.

1.1

Power modes

In the high-performance STM32F4 series based on the ARM® Cortex™-M4 32-bit/DSP

processor cores, designers at STMicroelectronics have highly optimized low-power modes

to define the best compromise between low-power consumption, short startup time and

available wake-up sources.

In this part, we give an overview of the STM32F4 power mode consumptions.

1.1.1

Low-power mode overview

By default, and after power-on or a system reset, the STM32F4 is in Run mode, which is a

fully active mode that consumes much power even when performing minor tasks. Low-

power modes are available to save power when the CPU does not need to be kept running.

It is up to the user to switch between power modes during application processing in order to

reduce the overall average consumption by keeping the device as much as possible in low-

power modes, as described in Figure 1. The user should just select each time the low-power

mode with features that fit his design requirements.

Figure 1. Power mode switch

AN4365 Datasheet(PDF) 6 Page - STMicroelectronics