Is the 4mA increase in current consumption expected when we just enable the wide bus operation in uSD card...












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In a product which requires power consumption to be minimum as possible, we are employing a STM32L496 as MCU. In recent days, we were trying to bring down the power consumption of the overall device. We observed that immediately after enabling the wide bus operation using the HAL function in uSD card, the current consumed increases by ~4mA. (uSD card is attached when this function is called).



Is this current increase expected?
Is there anything wrong in the below provided sequence of initializing the SDMMC interface and uSD card?
Kindly please help us to analyze the issue and bring down the current consumed if this is not expected increase.



Details:



MCU : STM32L496
Core supply : External SMPS (1.2V).
Core frequency : 20 MHz


SDMMC pin configuration:



All data pins, command and clock pins are in alternate function push pull mode with no internal pull up. External clamp IC (ECLAMP2410P) is used in between the SDMMC interface and uSD card connector.



SDMMC init code:



uint8_t sd_init(void)
{
uint8_t sd_state = MSD_OK;

/* uSD device interface configuration */
g_uSd_handle.Instance = SDMMC1;
g_uSd_handle.Init.ClockEdge = SDMMC_CLOCK_EDGE_RISING;
g_uSd_handle.Init.ClockBypass = SDMMC_CLOCK_BYPASS_DISABLE;
g_uSd_handle.Init.ClockPowerSave = SDMMC_CLOCK_POWER_SAVE_ENABLE;
g_uSd_handle.Init.BusWide = SDMMC_BUS_WIDE_1B;
g_uSd_handle.Init.HardwareFlowControl = SDMMC_HARDWARE_FLOW_CONTROL_ENABLE;
g_uSd_handle.Init.ClockDiv = SDMMC_TRANSFER_CLK_DIV;

/* Msp SD initialization */

/* HAL SD initialization */
if (HAL_SD_Init(&g_uSd_handle) != HAL_OK)
{
sd_state = MSD_ERROR;
}

// Current increase is observed after the execution of below code segment


/* Configure SD Bus width */
if (sd_state == MSD_OK)
{
/* Enable wide operation */
if (HAL_SD_ConfigWideBusOperation(&g_uSd_handle, SDMMC_BUS_WIDE_4B) != HAL_OK)
{
sd_state = MSD_ERROR;
}
else
{
sd_state = MSD_OK;
}
}

return sd_state;
}









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put on hold as off-topic by Ramhound, Twisty Impersonator, Mokubai Jan 7 at 13:51


This question appears to be off-topic. The users who voted to close gave this specific reason:


  • "This question is not about computer hardware or software, within the scope defined in the help center." – Ramhound, Twisty Impersonator, Mokubai

If this question can be reworded to fit the rules in the help center, please edit the question.


















    0















    In a product which requires power consumption to be minimum as possible, we are employing a STM32L496 as MCU. In recent days, we were trying to bring down the power consumption of the overall device. We observed that immediately after enabling the wide bus operation using the HAL function in uSD card, the current consumed increases by ~4mA. (uSD card is attached when this function is called).



    Is this current increase expected?
    Is there anything wrong in the below provided sequence of initializing the SDMMC interface and uSD card?
    Kindly please help us to analyze the issue and bring down the current consumed if this is not expected increase.



    Details:



    MCU : STM32L496
    Core supply : External SMPS (1.2V).
    Core frequency : 20 MHz


    SDMMC pin configuration:



    All data pins, command and clock pins are in alternate function push pull mode with no internal pull up. External clamp IC (ECLAMP2410P) is used in between the SDMMC interface and uSD card connector.



    SDMMC init code:



    uint8_t sd_init(void)
    {
    uint8_t sd_state = MSD_OK;

    /* uSD device interface configuration */
    g_uSd_handle.Instance = SDMMC1;
    g_uSd_handle.Init.ClockEdge = SDMMC_CLOCK_EDGE_RISING;
    g_uSd_handle.Init.ClockBypass = SDMMC_CLOCK_BYPASS_DISABLE;
    g_uSd_handle.Init.ClockPowerSave = SDMMC_CLOCK_POWER_SAVE_ENABLE;
    g_uSd_handle.Init.BusWide = SDMMC_BUS_WIDE_1B;
    g_uSd_handle.Init.HardwareFlowControl = SDMMC_HARDWARE_FLOW_CONTROL_ENABLE;
    g_uSd_handle.Init.ClockDiv = SDMMC_TRANSFER_CLK_DIV;

    /* Msp SD initialization */

    /* HAL SD initialization */
    if (HAL_SD_Init(&g_uSd_handle) != HAL_OK)
    {
    sd_state = MSD_ERROR;
    }

    // Current increase is observed after the execution of below code segment


    /* Configure SD Bus width */
    if (sd_state == MSD_OK)
    {
    /* Enable wide operation */
    if (HAL_SD_ConfigWideBusOperation(&g_uSd_handle, SDMMC_BUS_WIDE_4B) != HAL_OK)
    {
    sd_state = MSD_ERROR;
    }
    else
    {
    sd_state = MSD_OK;
    }
    }

    return sd_state;
    }









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    put on hold as off-topic by Ramhound, Twisty Impersonator, Mokubai Jan 7 at 13:51


    This question appears to be off-topic. The users who voted to close gave this specific reason:


    • "This question is not about computer hardware or software, within the scope defined in the help center." – Ramhound, Twisty Impersonator, Mokubai

    If this question can be reworded to fit the rules in the help center, please edit the question.
















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      0








      In a product which requires power consumption to be minimum as possible, we are employing a STM32L496 as MCU. In recent days, we were trying to bring down the power consumption of the overall device. We observed that immediately after enabling the wide bus operation using the HAL function in uSD card, the current consumed increases by ~4mA. (uSD card is attached when this function is called).



      Is this current increase expected?
      Is there anything wrong in the below provided sequence of initializing the SDMMC interface and uSD card?
      Kindly please help us to analyze the issue and bring down the current consumed if this is not expected increase.



      Details:



      MCU : STM32L496
      Core supply : External SMPS (1.2V).
      Core frequency : 20 MHz


      SDMMC pin configuration:



      All data pins, command and clock pins are in alternate function push pull mode with no internal pull up. External clamp IC (ECLAMP2410P) is used in between the SDMMC interface and uSD card connector.



      SDMMC init code:



      uint8_t sd_init(void)
      {
      uint8_t sd_state = MSD_OK;

      /* uSD device interface configuration */
      g_uSd_handle.Instance = SDMMC1;
      g_uSd_handle.Init.ClockEdge = SDMMC_CLOCK_EDGE_RISING;
      g_uSd_handle.Init.ClockBypass = SDMMC_CLOCK_BYPASS_DISABLE;
      g_uSd_handle.Init.ClockPowerSave = SDMMC_CLOCK_POWER_SAVE_ENABLE;
      g_uSd_handle.Init.BusWide = SDMMC_BUS_WIDE_1B;
      g_uSd_handle.Init.HardwareFlowControl = SDMMC_HARDWARE_FLOW_CONTROL_ENABLE;
      g_uSd_handle.Init.ClockDiv = SDMMC_TRANSFER_CLK_DIV;

      /* Msp SD initialization */

      /* HAL SD initialization */
      if (HAL_SD_Init(&g_uSd_handle) != HAL_OK)
      {
      sd_state = MSD_ERROR;
      }

      // Current increase is observed after the execution of below code segment


      /* Configure SD Bus width */
      if (sd_state == MSD_OK)
      {
      /* Enable wide operation */
      if (HAL_SD_ConfigWideBusOperation(&g_uSd_handle, SDMMC_BUS_WIDE_4B) != HAL_OK)
      {
      sd_state = MSD_ERROR;
      }
      else
      {
      sd_state = MSD_OK;
      }
      }

      return sd_state;
      }









      share|improve this question









      New contributor




      HariP is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.












      In a product which requires power consumption to be minimum as possible, we are employing a STM32L496 as MCU. In recent days, we were trying to bring down the power consumption of the overall device. We observed that immediately after enabling the wide bus operation using the HAL function in uSD card, the current consumed increases by ~4mA. (uSD card is attached when this function is called).



      Is this current increase expected?
      Is there anything wrong in the below provided sequence of initializing the SDMMC interface and uSD card?
      Kindly please help us to analyze the issue and bring down the current consumed if this is not expected increase.



      Details:



      MCU : STM32L496
      Core supply : External SMPS (1.2V).
      Core frequency : 20 MHz


      SDMMC pin configuration:



      All data pins, command and clock pins are in alternate function push pull mode with no internal pull up. External clamp IC (ECLAMP2410P) is used in between the SDMMC interface and uSD card connector.



      SDMMC init code:



      uint8_t sd_init(void)
      {
      uint8_t sd_state = MSD_OK;

      /* uSD device interface configuration */
      g_uSd_handle.Instance = SDMMC1;
      g_uSd_handle.Init.ClockEdge = SDMMC_CLOCK_EDGE_RISING;
      g_uSd_handle.Init.ClockBypass = SDMMC_CLOCK_BYPASS_DISABLE;
      g_uSd_handle.Init.ClockPowerSave = SDMMC_CLOCK_POWER_SAVE_ENABLE;
      g_uSd_handle.Init.BusWide = SDMMC_BUS_WIDE_1B;
      g_uSd_handle.Init.HardwareFlowControl = SDMMC_HARDWARE_FLOW_CONTROL_ENABLE;
      g_uSd_handle.Init.ClockDiv = SDMMC_TRANSFER_CLK_DIV;

      /* Msp SD initialization */

      /* HAL SD initialization */
      if (HAL_SD_Init(&g_uSd_handle) != HAL_OK)
      {
      sd_state = MSD_ERROR;
      }

      // Current increase is observed after the execution of below code segment


      /* Configure SD Bus width */
      if (sd_state == MSD_OK)
      {
      /* Enable wide operation */
      if (HAL_SD_ConfigWideBusOperation(&g_uSd_handle, SDMMC_BUS_WIDE_4B) != HAL_OK)
      {
      sd_state = MSD_ERROR;
      }
      else
      {
      sd_state = MSD_OK;
      }
      }

      return sd_state;
      }






      sd-card power-consumption






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      share|improve this question




      share|improve this question








      edited Jan 7 at 12:06









      Ahmed Ashour

      1,146611




      1,146611






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      asked Jan 7 at 11:53









      HariPHariP

      12




      12




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      New contributor





      HariP is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






      HariP is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.




      put on hold as off-topic by Ramhound, Twisty Impersonator, Mokubai Jan 7 at 13:51


      This question appears to be off-topic. The users who voted to close gave this specific reason:


      • "This question is not about computer hardware or software, within the scope defined in the help center." – Ramhound, Twisty Impersonator, Mokubai

      If this question can be reworded to fit the rules in the help center, please edit the question.




      put on hold as off-topic by Ramhound, Twisty Impersonator, Mokubai Jan 7 at 13:51


      This question appears to be off-topic. The users who voted to close gave this specific reason:


      • "This question is not about computer hardware or software, within the scope defined in the help center." – Ramhound, Twisty Impersonator, Mokubai

      If this question can be reworded to fit the rules in the help center, please edit the question.






















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