How to define your low-power strategy

1. Purpose

This article proposes some guidelines in order to determine the best low power strategy for your STM32MP15 product.

2. STM32MP15 main power supplies

For a good understanding of this article, it is important to understand the perimeter of the two STM32MP15 main power supplies:

• VDD power supply input for I/Os and system analog such as reset, power management and oscillators and PLLs
• VDDcore digital core domain supply, dependent on VDD supply. VDD shall be present before VDDCORE

For more information, please refer to the PWR chapter of the STM32MP15 Reference Manual.

3. STM32MP15 low power modes overview

When the system does not need to run for a while, various actions can be taken to reduce its power consumption:

• Stop the clocks: this corresponds to the Stop mode and the external regulator can even be allowed to switch in low power mode in order to reduce its power consumption: this is the LP-Stop mode.
• Reduce the supply voltage

4. STM32MP15 low power modes overview

For each supported low power mode (described in the AN5109), the figure below shows:

• The peripherals that can be used as wake up sources (in grey boxes)
• The STM32MP15 typical power consumption (on the left)
• The system wake up times in various configurations (on the right)

Low power (MIPI^® Alliance DSI standard)