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ASchm.4
ASchm.4
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November 24, 2020
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Difference between voltage regulator modes in stop mode [STM32F413VGTx]

  • November 24, 2020
  • 3 replies
  • 2383 views

Question seems simple enough, but i cant find any information on this in the datasheet or refman:

When i put the mcu in stop-mode using the hal driver, i call this function:

HAL_PWR_EnterSTOPMode(PWR_MAINREGULATOR_ON, PWR_STOPENTRY_WFI);

The first parameter of this function can be either PWR_MAINREGULATOR_ON or PWR_LOWPOWERREGULATOR_ON.

The function seems to set the LPDS bit in PWR_CR register based on that parameter. According to the reference manual, this means:

0: Voltage regulator on during Stop mode.

1: Low-power Voltage regulator on during Stop mode.

That is not enough information to decide what i should go with for my application.

"Low-power Voltage regulator" implies that the MCU consumes less power in this mode. How much less? And what is the down-side of using the Low-power Voltage regulator?

    Best answer by TDK

    It increases the wakeup latency. I couldn't see any other downside.

    0693W000005Ch61QAC.png

    3 replies

    TDK
    TDKAnswer
    Super User
    November 26, 2020

    It increases the wakeup latency. I couldn't see any other downside.

    0693W000005Ch61QAC.png

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    ASchm.4
    ASchm.4Author
    Associate
    December 1, 2020

    Cool. im ok with that. Thanks for your reply

    Robmar
    Robmar
    Senior II
    March 12, 2024

    I can't find one working code example from STM, all are out of date, function and flag names out of date, or missing files for certain HAL definitions such as PWR_CPUCR_RETDS_CD

    Another ST-Mess!

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