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AN4515

Application current consumption

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3.2

Software settings

The measures below are taken using a code compiled with MDK-ARM toolchain V5.12 and

with optimization Level3(-O3).

3.3

Measured current consumption

This section compares the current consumptions obtained in the following conditions:

•

Flash memory stopped and CPU in Sleep mode

•

Flash memory active and the CPU in Sleep mode.

Table 4 describes the average measures obtained for the MEMS loop part (SLEEP5, RUN7,

SLEEP6 and RUN8) in the use case state machine.

Table 4 shows a significant current consumption reduction of around 27 % obtained with the

new STM32F411xx Stop Flash while CPU in Sleep feature (BAM).

Table 4. Current consumption example

Configuration Menu

Active peripherals

Current

Consumption

(uA)

Flash active while CPU in sleep

FLASH, RTC, USART2, DMA1(only

stream0 and stream 6 enabled), I2C1

970

Stop Flash while CPU in sleep (BAM)

RTC, USART2, DMA1(only stream0 and

stream 6 enabled), I2C1

710