Unexpected Current Consumption in STOP2 Mode on STM32U595
Hi everyone,
I’m facing an issue with power consumption in STOP2 mode on my custom board.
The board includes only the STM32U595 MCU, bypass and decoupling capacitors, and the inductor for the SMPS — nothing else is connected.
According to the datasheet, I expect a current consumption of around 4.65 µA in STOP2 mode (pag 214 Table 59, VDD = 3.3 V).
However, when I measure it with my STLINK Power Monitor, I get about ~10 µA with fast oscillations.
MX configuration:
All peripherals are disabled
SysClk = 16 MHz
All SRAM banks in Power-Down mode
Power saving mode enabled
SMPS enabled
Voltage scale = Range 4
All pins configured as analog input (via Project Manager → Code Generator)
Application code:
HAL_DBGMCU_DisableDBGStopMode();
HAL_Delay(5000);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
printf("Entering lowpower mode\r\n");
HAL_Delay(500);
HAL_SuspendTick();
HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI);
// HAL_PWREx_EnterSHUTDOWNMode();
}Does anyone have an idea what could be causing this higher current consumption in STOP2 mode?
Any suggestions or insights would be greatly appreciated!