STM32H747: Reducing standby mode current consumption

[RopApe]

Hello,

 

We are using the STM32H747AI on a custom board and attempting to enter standby mode for power savings. The system supply is configured as "SMPS supplies LDO (no external supply)" to be able to use the boosted performance at 480MHz, but the chip still draws around 20 mA in standby mode with the M4 core disabled.

 

To verify these results, we performed the same measurements on the STM32H747I-DISCO board, modifying the jumpers to match the same supply configuration. The results were similar.

 

Is there anything specific we must do to further reduce current consumption?

 

[Sarra.S]

Hello @RopApe, 

Configure all GPIOs to analog mode or as inputs with no pull-up/down resistors to minimize leakage currents, refer to this article: How to minimize the power consumption in low power... - STMicroelectronics Community 

 

[RopApe]

Hello @Sarra.S,

We have already tested this approach and observed that it saves a few microamps, but the overall current consumption remains around 20 mA.

We also ran the same code on the discovery board using the default "Direct SMPS supply" configuration, where it successfully reduced power consumption to 80 µA. That's why we suspect that the higher current draw might be related to the "SMPS supplies LDO" configuration.