How to measure power consumption for Nucleo-144 board?

[Dick Lin]

I am trying to measure the power consumption for Nucleo-144 board.

Here is my config

• External power supply 8V
• JP6 to VIN
• Connect Fluke multimeter to power supply
• Connect multimeter to CN8 pin 15
• Connect ST-Link
• Call HAL_PWR_EnterSTANDBYMode() or LL_PWR_SetPowerMode(LL_PWR_MODE_SHUTDOWN) force system going standby/shutdown mode.

Is the config correct? I am trying to disable most of the buses before standby. The system doesn't seems go to standby mode since after the call, I am still able to run from IDE.

Is there anything I am missing here?

Thx

HAL_ADCEx_DisableVoltageRegulator(&hadc1);

// HAL_CAN_RequestSleep(&hcan1);

HAL_CAN_Stop(&hcan1);

LL_SPI_Disable(hspi1.Instance);

LL_SPI_Disable(hspi2.Instance);

LL_USART_Disable(huart1.Instance);

LL_USART_Disable(huart2.Instance);

LL_USART_Disable(huart4.Instance);

__HAL_RCC_SPI1_CLK_DISABLE();

__HAL_RCC_SPI2_CLK_DISABLE();

__HAL_RCC_CAN1_CLK_DISABLE();

__HAL_RCC_USART1_CLK_DISABLE();

__HAL_RCC_USART2_CLK_DISABLE();

__HAL_RCC_UART4_CLK_DISABLE();

__HAL_RCC_I2C1_CLK_DISABLE();

__HAL_RCC_I2C2_CLK_DISABLE();

__HAL_RCC_RTCAPB_CLK_DISABLE();

// Disable all used wakeup sources: WKUP pin

HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN2);

HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN3);

// Clear all related wakeup flags

/* Clear PWR wake up Flag */

__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);

__GPIOA_CLK_DISABLE();

__GPIOB_CLK_DISABLE();

__GPIOC_CLK_DISABLE();

__GPIOD_CLK_DISABLE();

__GPIOE_CLK_DISABLE();

__PWR_CLK_DISABLE();

SysTick->CTRL=0x00;

// HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN2);

// HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN3);

__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);

HAL_PWR_EnterSTANDBYMode();

[Dick Lin]

It's interesting. Following GPIO clock disable code actually make system not going to standby mode. I am not sure what's happening. Thx

__GPIOA_CLK_DISABLE();

__GPIOB_CLK_DISABLE();

__GPIOC_CLK_DISABLE();

__GPIOD_CLK_DISABLE();

__GPIOE_CLK_DISABLE();

__PWR_CLK_DISABLE();

SysTick->CTRL=0x00;

[Tesla DeLorean]

Have you tried using an ammeter across the pins normally occupied by JP5? The IDD Jumper

[Dick Lin]

I got 16 mA for both standby and shutdown mode. The value should be much lower. Is the config not right or something else ? Thx

[Dick Lin]

Yeah, IDD works as expected, down to 0.38 mA in standby mode. Now I am moving to our own board, seems SPI disable function doesn't seems functional well. Thx

[Dick Lin]

I can only go down to 2 mA for the standby mode for our board. I am not sure if there is anything missing.

I am pretty sure the only thing power with 3.3 VL is the MCU. We removed external flash, EEPROM. No other component is powered.

Any thoughts what might be missing?

Thx

[Tesla DeLorean]

Not really, I can't commit resources to low-power issues. You should talk with the FAE supporting your design, and perhaps contact the local sales office if your account doesn't have one.

[Dick Lin]

One thing I am working on is the GPIO pin before going standby mode. Should I program it to RESET or high impedance or is this matter? Thx

[Dick Lin]

One thing I noticed is the UART port. Even I already disable UART, CLOCK, the TX/RX pin still consume power. Not sure what's going on. Thx

LL_USART_Disable(huart1.Instance);

LL_USART_Disable(huart2.Instance);

LL_USART_Disable(huart4.Instance);

__HAL_RCC_SPI1_CLK_DISABLE();

__HAL_RCC_SPI2_CLK_DISABLE();

__HAL_RCC_CAN1_CLK_DISABLE();

__HAL_RCC_USART1_CLK_DISABLE();

__HAL_RCC_USART2_CLK_DISABLE();

__HAL_RCC_UART4_CLK_DISABLE();

  // USART1 GPIO Configuration

  // PB6   ------> USART1_TX

  // PA10   ------> USART1_RX

GPIO_InitStruct.Pin = GPIO_PIN_10;

GPIO_InitStruct.Mode = GPIO_MODE_INPUT;

GPIO_InitStruct.Pull = GPIO_NOPULL;

HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

GPIO_InitStruct.Pin = GPIO_PIN_6;

GPIO_InitStruct.Mode = GPIO_MODE_INPUT;

HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_RESET);

HAL_GPIO_WritePin(GPIOA, GPIO_PIN_10, GPIO_PIN_RESET);

[Dick Lin]

Finally figured out the 2 mA was eaten by the JTAG/ST-LINK connection, Removed the JTAG connector will bring the power consumption down to 0.01 mA. Thx