STM32H723VET Lowest power mode questions using Cube IDE

[andrew_henseleit]

I am using the Cube IDE to put the STM32H723VET into standby (which to my knowledge is the lowest power consumption). The code below is what I use, I just want to make sure this is doing things correctly and I haven't missed any settings or anything I haven't stopped. It does go to sleep and wake up but the current is higher than I think it should be. Trying to rule out something easy before I dig into Hardware!!

__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU); //clear WU flag

 HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN4); //enable WU pin

 HAL_SuspendTick();

 HAL_PWR_EnterSTANDBYMode();

[Petr DAVID]

Hello Andrew_henseleit,

I was checking your code relating to PWR_STANDBY_RTC example available in STM32H7Cube software package and it looks fine to me. What current consumption are you measuring? In the code example I have mentioned there is note about making sure not to miss any wake up event with recommended sequence:

• Disable all used wakeup sources
• Clear all related wakeup flags
• Re-enable all used wakeup sources
• Enter the Standby mode

But if you are using just now wake up source this probably not apply to you. Let me know about about the measurements you are getting.

[andrew_henseleit]

I am measuring total system current. I now have a board with just a processor on it to isolate the issue. The lowest I can seem to get with 1 wakeup source (WAKEUP_PIN4_LOW) is 0.5mA. It does wake up but that seems too high still.

[andrew_henseleit]

With our custom HW it runs nominal at 148mA but the sleep drops to 10mA. Its impossible for me to pull out just the power for the processor. I did notice AN5014 mentioned multi core needed for standby. I have updated the Standby in the HAL to match this statement and plan to test tomorrow.

[Piranha]

Set DBGMCU_CR = 0; before entering standby mode and physically disconnect the debug probe.

[andrew_henseleit]

The above line did not do anything to my sleep current. It appears that the issue lies somewhere in my system clock. If I sleep before that then everything is good. Clock settings attached, I do not use the RTC and have 2 external oscillators.

void SystemClock_Config(void)

{

 RCC_OscInitTypeDef RCC_OscInitStruct = {0};

 RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

 /** Supply configuration update enable

 */

 HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY);

 /** Configure the main internal regulator output voltage

 */

 __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE0);

 while(!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY)) {}

 /** 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 = 3;

 RCC_OscInitStruct.PLL.PLLN = 68;

 RCC_OscInitStruct.PLL.PLLP = 1;

 RCC_OscInitStruct.PLL.PLLQ = 4;

 RCC_OscInitStruct.PLL.PLLR = 2;

 RCC_OscInitStruct.PLL.PLLRGE = RCC_PLL1VCIRANGE_3;

 RCC_OscInitStruct.PLL.PLLVCOSEL = RCC_PLL1VCOWIDE;

 RCC_OscInitStruct.PLL.PLLFRACN = 6144;

 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_CLOCKTYPE_D3PCLK1|RCC_CLOCKTYPE_D1PCLK1;

 RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;

 RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;

 RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV2;

 RCC_ClkInitStruct.APB3CLKDivider = RCC_APB3_DIV2;

 RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV2;

 RCC_ClkInitStruct.APB2CLKDivider = RCC_APB2_DIV2;

 RCC_ClkInitStruct.APB4CLKDivider = RCC_APB4_DIV2;

 if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)

 {

  Error_Handler();

 }

}

[andrew_henseleit]

Update #2. When I changed my wakeup pin polarity to LOW instead of HIGH, my micro goes into standby at 0.5mA. This still seems high to me, its supposed be a few microamps per the datasheet right?

 __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU); //clear WU flag

  __HAL_PWR_CLEAR_FLAG(PWR_FLAG_SB);

  HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN4_LOW); //enable WU pin

  HAL_SuspendTick();

  HAL_PWR_EnterSTANDBYMode();

[andrew_henseleit]

Update #3. I have taken out all code, I have set the everything off, all I have connected is an external oscillator and the power supplies needed to turn the chip on. Still only goes to 110uA. I don't believe my supplies are taking up 108uA or Q current. This is literally the only code in the project. What could I still possibly be doing wrong here??

 HAL_Delay(5000);

 HAL_Delay(5000);

 HAL_Delay(5000);

 HAL_Delay(5000);

 HAL_Delay(5000);

 //GO TO SLEEP HERE

 //HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN4); //disable wakeup pin

 __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU); //clear WU flag

 __HAL_PWR_CLEAR_FLAG(PWR_FLAG_SB);

 //HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN4_LOW); //enable WU pin

 HAL_DisableDBGStandbyMode();

 HAL_DisableDomain3DBGStandbyMode();

 HAL_PWR_DisableBkUpAccess();

 HAL_PWR_DisablePVD();

 HAL_SuspendTick();

 HAL_PWR_EnterSTANDBYMode();