M261的主电源切换方法

1万 · 2020-2-20 18:26

在手册360页有提到选择位的寄存器位置。
然后查看头文件，找到DCDC关键字。

/*---------------------------------------------------------------------------------------------------------*/

/*  PLCTL constant definitions. (Write-Protection Register)                                                */

/*---------------------------------------------------------------------------------------------------------*/

#define SYS_PLCTL_PLSEL_PL0     (0x0UL<<SYS_PLCTL_PLSEL_Pos)   /*!< Set power level to power level 0 */

#define SYS_PLCTL_PLSEL_PL1     (0x1UL<<SYS_PLCTL_PLSEL_Pos)   /*!< Set power level to power level 1 */

#define SYS_PLCTL_MVRS_LDO      (0x0UL<<SYS_PLCTL_MVRS_Pos)    /*!< Set main voltage regulator type to LDO */

#define SYS_PLCTL_MVRS_DCDC     (0x1UL<<SYS_PLCTL_MVRS_Pos)    /*!< Set main voltage regulator type to DCDC */

然后找对应的.c

复制

/**

  * [url=home.php?mod=space&uid=247401]@brief[/url]      Set Main Voltage Regulator Type

  * @param[in]  u32PowerRegulator is main voltage regulator type. Including :

  *             - \ref SYS_PLCTL_MVRS_LDO

  *             - \ref SYS_PLCTL_MVRS_DCDC

  * @retval     0  main voltage regulator type setting is not finished

  * @retval     1  main voltage regulator type setting is finished

  * [url=home.php?mod=space&uid=1543424]@Details[/url]    This function set main voltage regulator type.

  *             The main voltage regulator type setting to DCDC cannot finished if the inductor is not detected.

  *             The register write-protection function should be disabled before using this function.

  */

uint32_t SYS_SetPowerRegulator(uint32_t u32PowerRegulator)

{

    int32_t i32TimeOutCnt = 400;

    uint32_t u32Ret = 1U;

    uint32_t u32PowerRegStatus;



    /* Get main voltage regulator type status */

    u32PowerRegStatus = SYS->PLSTS & SYS_PLSTS_CURMVR_Msk;



    /* Set main voltage regulator type */

    if((u32PowerRegulator == SYS_PLCTL_MVRS_DCDC) && (u32PowerRegStatus == SYS_PLSTS_CURMVR_LDO))

    {



        /* Set main voltage regulator type to DCDC if status is LDO */

        SYS->PLCTL |= SYS_PLCTL_MVRS_Msk;



        /* Wait induction detection and main voltage regulator type change ready */

        while((SYS->PLSTS & SYS_PLSTS_CURMVR_Msk) != SYS_PLSTS_CURMVR_DCDC)

        {

            if(i32TimeOutCnt-- <= 0)

            {

                u32Ret = 0U;    /* Main voltage regulator type change time-out */

                break;

            }

        }



    }

    else if(u32PowerRegulator == SYS_PLCTL_MVRS_LDO)

    {



        /* Set main voltage regulator type to LDO if status is DCDC */

        SYS->PLCTL &= (~SYS_PLCTL_MVRS_Msk);



        /* Wait main voltage regulator type change ready */

        while((SYS->PLSTS & SYS_PLSTS_CURMVR_Msk) != SYS_PLSTS_CURMVR_LDO)

        {

            if(i32TimeOutCnt-- <= 0)

            {

                u32Ret = 0U;    /* Main voltage regulator type change time-out */

                break;

            }

        }



    }



    /* Clear main voltage regulator type change error flag */

    if(SYS->PLSTS & SYS_PLSTS_MVRCERR_Msk)

    {

        SYS->PLSTS = SYS_PLSTS_MVRCERR_Msk;

        u32Ret = 0U;

    }



    return u32Ret;

}

1万 · 2020-2-20 18:27

这样就可以在LDO和DCDC之间选择了，可以降低功耗。

1万 · 2020-2-20 18:28

Regarding the power consumption of the NuMicro® M261/M262/M263 series, 97 μA/MHz (LDO mode) and 45 μA/MHz (DC-DC mode) in normal run mode, 2.8 μA in Standby Power-down mode, and less than 2μA in Deep Power-down mode without VBAT. It’s low power, wide supply voltage and fast wake-up features make it suitable for battery-powered IoT applications.

只看该作者 · 2020-2-20 20:09

我分别运行了下面和代码，延时30秒后测电流，运行时电流2.5ma,掉电后差不多0.7ma，几乎相同呀，看资料不是区别差不多2倍吗？什么原因呀？

SYS_SetPowerRegulator(SYS_PLCTL_MVRS_LDO);

SYS_SetPowerRegulator(SYS_PLCTL_MVRS_DCDC);

1万 · 2020-2-20 22:49

nbiot 发表于 2020-2-20 20:09
我分别运行了下面和代码，延时30秒后测电流，运行时电流2.5ma,掉电后差不多0.7ma，几乎相同呀，看资料不是 ...

45 μA/MHz

你的是多少MHz速度

1万 · 2020-2-20 22:49

掉电不彻底？

只看该作者 · 2020-2-21 11:08

6MHz