MSP430F5529: about MSP430F5510 or MSP430F5529 enter LMP4 or LPM4.5

hu dahua

Part Number: MSP430F5529
Other Parts Discussed in Thread: MSP430WARE

I have a question about MSP430F5529 Low Power. when I use MSP430F5529 enter Low Power 4.5 status,The MCU current flow is 10~22uA,why not is 0.1uA.

when MCU power is 3.3V ,The MCU Low Power current flow is 22uA ，when MCU power is 1.8V,The MCU Low Power Current flow is 0.1uA. would you tell me why,Thanks.

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      //This code is about MSP430F5510 enter LPM4.5
      
      //将所有IO口配置为普通IO口
      P1DIR = 0x00;P2DIR = 0x00;P3DIR = 0x00;P4DIR = 0x00;P5DIR = 0x00;P6DIR = 0x00;
      PJDIR = 0x00;
      P1SEL = 0x00;P2SEL = 0x00;P3SEL = 0x00;P4SEL = 0x00;P5SEL = 0x00;P6SEL = 0x00;
      // 端口配置为下拉
//        P1REN = 0x00;//disabled Pullup or pulldown
//        P2REN = 0x00;
//        P3REN = 0x00;
//        P4REN = 0x00;
//        P5REN = 0x00;
//        P6REN = 0x00;
        // 端口配置为上拉
       P1REN = 0xFF;//disabled Pullup or pulldown
       P2REN = 0xFF;
       P3REN = 0xFF;
       P4REN = 0xFF;
       P5REN = 0xFF;
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

      //This code is about MSP430F5510 enter LPM4.5
      
      //将所有IO口配置为普通IO口
      P1DIR = 0x00;P2DIR = 0x00;P3DIR = 0x00;P4DIR = 0x00;P5DIR = 0x00;P6DIR = 0x00;
      PJDIR = 0x00;
      P1SEL = 0x00;P2SEL = 0x00;P3SEL = 0x00;P4SEL = 0x00;P5SEL = 0x00;P6SEL = 0x00;

      // 端口配置为下拉
//        P1REN = 0x00;//disabled Pullup or pulldown
//        P2REN = 0x00;
//        P3REN = 0x00;
//        P4REN = 0x00;
//        P5REN = 0x00;
//        P6REN = 0x00;

        // 端口配置为上拉
       P1REN = 0xFF;//disabled Pullup or pulldown
       P2REN = 0xFF;
       P3REN = 0xFF;
       P4REN = 0xFF;
       P5REN = 0xFF;
       P6REN = 0xFF;

      GPIO_ExtInt_Init();

//      UCSCTL4=UCSCTL4&(~(SELS_7|SELM_7))|SELS_1|SELM_1;
     //将SMCLK和MCLK配置为VLOCLK

      UCSCTL8 &= ~MCLKREQEN;
      UCSCTL8 &= ~ACLKREQEN;
      UCSCTL8 &= ~SMCLKREQEN;
      UCSCTL8 &= ~MODOSCREQEN;


      /* UCSCTL4&(~(SELS_7|SELM_7))这一语句相当于先把SELS和SELM清零*/
//   UCSCTL4=UCSCTL4&(~(SELS_7|SELM_7|SELA_7))|SELS_1|SELM_1;
  //将SMCLK和MCLK配置为VLOCLK

      PMMCTL0_H = PMMPW_H;                // Open PMM Registers for write
      PMMCTL0_L |= PMMREGOFF;             // and set PMMREGOFF

       SVSMLCTL &= ~SVMLE;   //关闭SVML模块
      SVSMLCTL &= ~SVSLE;   //关闭SVS模块

      SVSMHCTL &= ~SVSHE;
      SVSMHCTL &= ~SVMHE;

      PM5CTL0 &= ~LOCKLPM5;       //清除LOCKLPM5，解除端口状态锁定 锁定所有端口状态，
                                  //   必须在此之前将所有端口的状态改变为最低功耗，锁定。

      PMMCTL0_H = 0;     // Lock PMM Registers

    
      __bis_SR_register(LPM4_bits + GIE);

over 1 year ago

0 Brandon Fisher94 over 1 year ago

TI__Mastermind 28070 points

Hi hu dahua,

Are all your input pins floating? That can be a source of additional leakage current.

I would try the LPM4 example from MSP430ware: https://dev.ti.com/tirex/explore/node?node=A__ABnxftBNTycCTxYb16r91w__msp430ware__IOGqZri__LATEST

That will tell us quickly if its a configuration/hardware or a software thing. That example configures all the pins as outputs driven low, so be aware of that if you have any pins in your system that would cause contention with.

Best Regards,
Brandon Fisher

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MSP430F5529: about MSP430F5510 or MSP430F5529 enter LMP4 or LPM4.5