STOP mode F405 hard to come down 1mA

[SBaro.11]

Hi all,

I'm trying to acheive STOP mode on my stm32f405, but ir's hard to come down 1mA as de datasheet say < 100uA. So to explain my project :

- STM32F405 Freertos

- 3 i2c capteur (power of captor is managed by switch)

- 1 spi flash nand w25n01

My clock conf

  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Configure the main internal regulator output voltage
  */
  __HAL_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 4;
  RCC_OscInitStruct.PLL.PLLN = 168;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 7;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
//        Error_Handler();
  }
  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
                                | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK) {
//        Error_Handler();
  }
}

Here is my function for going in stop mode

vTaskSuspendAll();

    close_log_file();
    power_off_led();

    desactive_i2c_captors();  //switch off vcc for i2c captor
    HAL_DBGMCU_DisableDBGStopMode();
    HAL_ADC_DeInit(&hadc1);
    W25n01g_deselect();
    GPIO_InitTypeDef GPIO_InitStructure;

    __HAL_RCC_GPIOA_CLK_ENABLE();
    __HAL_RCC_GPIOB_CLK_ENABLE();
    __HAL_RCC_GPIOC_CLK_ENABLE();

    GPIO_InitStructure.Pin = GPIO_PIN_All;
    GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
    GPIO_InitStructure.Pull = GPIO_NOPULL;

    HAL_GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.Pin = GPIO_PIN_All;
    GPIO_InitStructure.Pin &= ~(GPIO_PIN_8);
    GPIO_InitStructure.Pin &= ~(GPIO_PIN_11);
    GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
    GPIO_InitStructure.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);

    GPIO_InitStructure.Pin = GPIO_PIN_9 | GPIO_PIN_10 | GPIO_PIN_11;
    GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
    GPIO_InitStructure.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);

    HAL_SuspendTick();
    taskEXIT_CRITICAL();
    HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);

if I understand correctly the stop mode deactivates all the clocks, so I don't need to make calls __HAL_RCC_USART1_CLK_DISABLE for example, so in my case my 1mA consumption should be come to GPIO ? SHould I do something with my clock source or not ?

[jiangfan]

First, you may try with example project from ST to see if your hardware board is OK or not, for example this project:

STM32CubeF4/Projects/STM32F4-Discovery/Examples/PWR/PWR_CurrentConsumption at master · STMicroelectronics/STM32CubeF4 · GitHub

[SBaro.11]

Yes I'll try it.

Did I understand the documentation correctly when I said that in stop mode it is not necessary to stop the device clocks ? For example if I used usart1 I don't have to call

__HAL_RCC_USART1_CLK_DISABLE

[jiangfan]

You may read chapter 5 Power controller (PWR) about STOP mode of RM0090 for STM32F405. most device clocks stopped in STOP mode except LSI/LSE/RTC/... (may be on by configuration). So, I tend to agree with you - no need to call  __HAL_RCC_USART1_CLK_DISABLE

[Andrew Neil · Accepted solution]

You need to post the full schematic of your board: at the microamp level, the hardware design is also an important part of the system.

---

@SBaro.11 wrote:

- 3 i2c capteur (power of captor is managed by switch)

---

Sorry, don't know what you mean by "capteur" here - hence a schematic with part numbers would be clearer.

As @jiangfan said, starting with an ST example would be a good way to check if your hardware is OK.

See also:

https://community.st.com/t5/stm32-mcus/tips-for-using-stm32-low-power-modes/ta-p/621007