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MSP-TS430PN80USB rev1.2 current consumption with MSP430F5529 in LPM3

Other Parts Discussed in Thread: MSP-TS430PN80USB, MSP430F5529, TEST

Hello,

I've purchased the MSP-TS430PN80USB EVM Board with MSP430F5529. I'm using this board as a referance for develop my project.Because my project is very sensible to current consumption, i'd like to know what is the overall current consumption of the board under these conditions:

- Board Power supply : 3 V
- Msp430F5529 set in LPM3 (CPUOFF = 1, SCG0 = 1, SCG1 = 1, OSCOFF = 0).
- ACLK = low frequency crystal operation (XTS = 0, XT1DRIVEx = 0).
  fACLK = 32768 Hz, fMCLK = fSMCLK = default DCO = 1.042 MHz
  USB disabled (VUSBEN = 0, SLDOEN = 0)
- Usb unconnected.

According to my test, the current consumption is about 31 uA, that is in contrast to the value declared on MSP430F5529 datasheet (3.9 uA). Here is the code I used to program  uC :

  WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer
 
  // Enable XT1
  P5SEL |= BIT4+BIT5;                       // Port select XT1
  UCSCTL6 &= ~(XT1OFF);                     // XT1 On
  UCSCTL6 |= XCAP_3;                        // Internal load cap

  // Loop until XT1 & DCO stabilizes
  do
  {
    UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG + DCOFFG);
                                            // Clear XT2,XT1,DCO fault flags
    SFRIFG1 &= ~OFIFG;                      // Clear fault flags
  }while (SFRIFG1&OFIFG);                   // Test oscillator fault flag

  UCSCTL6 &= ~(XT1DRIVE_3);                 // Xtal is now stable, reduce drive
                                            // strength
  // Port Configuration
  P1OUT = 0x00;P2OUT = 0x00;P3OUT = 0x00;P4OUT = 0x00;P5OUT = 0x00;P6OUT = 0x00;
  P7OUT = 0x00;P8OUT = 0x00;PJOUT = 0x00;
  P1DIR = 0xFF;P2DIR = 0xFF;P3DIR = 0xFF;P4DIR = 0xFF;P5DIR = 0xFF;P6DIR = 0xFF;
  P7DIR = 0xFF;P8DIR = 0xFF;PJDIR = 0xFF;

  // Disable VUSB LDO and SLDO
  USBKEYPID   =     0x9628;           // set USB KEYandPID to 0x9628
                                      // access to USB config registers enabled 
  USBPWRCTL &= ~(SLDOEN+VUSBEN);      // Disable the VUSB LDO and the SLDO
  USBKEYPID   =    0x9600;            // access to USB config registers disabled 

  // Disable SVS
  PMMCTL0_H = PMMPW_H;                // PMM Password
  SVSMHCTL &= ~(SVMHE+SVSHE);         // Disable High side SVS
  SVSMLCTL &= ~(SVMLE+SVSLE);         // Disable Low side SVS

  __bis_SR_register(LPM3_bits);       // Enter LPM3
  __no_operation();                   // For debugger


Is there somthing wrong in the procedure I used to set uC in stand by mode (LPM3) ? If you have any suggestions to reduce this current  consumption , please let me know.

Thank you.

  • Dear Luca

    when i had set port configuration like u my current consumption was high.

    I think port configuration isnt necessary for unused pins.

    I have a problem about current consumption,too.

    please read it and help me

    thanx

     

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