There is a significant difference in current consumption between STOP mode and STANDBY mode on the STM32L031.

[eunoia]

I built a low-power board using an STM32L031. The code I use to enter STOP mode and STANDBY mode is shown below.

In STANDBY mode, the board consumes about 2 µA. However, in STOP mode, it consumes about 90 µA, and I am not sure why there is such a large difference.

The circuit only consists of the STM32L031 and the power supply section. Could there be a problem with my code? Why is the current consumption so much higher in STOP mode than in STANDBY mode?

 

void EnterStopMode(void)
{
    __HAL_GPIO_EXTI_CLEAR_IT(GPIO_PIN_2);

    HAL_NVIC_ClearPendingIRQ(EXTI2_3_IRQn);

    HAL_SuspendTick();

    HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);

    SystemClock_Config();

    HAL_ResumeTick();
}



void EnterStandbyMode(void)
{
    __HAL_RCC_PWR_CLK_ENABLE();

    __HAL_PWR_CLEAR_FLAG(PWR_FLAG_SB);

    HAL_PWR_EnterSTANDBYMode();
}

[Gyessine]

Hello ​@eunoia 
It’s mentioned in the readme of the firmware example that you should disconnect PA12 pin from GND, when removed I managed to get few microamperes as consumption
I think I also should mention that I got the 85ua consumption (very close to yours) when i didn’t disconnect PA12 from GND pin
so are you sure that your PA12 pin is not connected to ground
I mean the experiments favours this hypothesis.
BR
Gyessine