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MSP430FR5969: Current consumption when using the HFXT crystal

Part Number: MSP430FR5969
Other Parts Discussed in Thread: ENERGYTRACE,

Hello.

 

I have a question.

I would like to know if there are data measured in a situation similar to the setting like the following.

When I use the 4MHz HFXT crystal and set MCLK at 1MHz, measurement result was 369 uA on average.

I measured MSP430FR5969 launchpad using EnergyTrace.

Register settings are as follows:

 

int main(void)

{

  WDTCTL = WDTPW | WDTHOLD;

 

  P1DIR = 0xFF;

  P1OUT = 0;

  P2DIR = 0xFF;

  P2OUT = 0;

  P3DIR = 0xFF;

  P3OUT = 0;

  //P3SEL1 |= BIT4;

  P4DIR = 0xFF;

  P4OUT = 0;

  PJOUT = 0;

  PJSEL0 |= BIT6 + BIT7;                

  PJDIR = 0xFFFF;

 

  PM5CTL0 &= ~LOCKLPM5;

 

  CSCTL0_H = CSKEY >> 8;                  

  CSCTL2 = SELA__VLOCLK + SELM__HFXTCLK + SELS__HFXTCLK;

  CSCTL3 = DIVM__4 + DIVS__1;                   

  CSCTL4 = 0x0409;

 

  do

  {

    CSCTL5 &= ~(LFXTOFFG | HFXTOFFG);                 

    SFRIFG1 &= ~OFIFG;

  }while (SFRIFG1&OFIFG);                  

 

  CSCTL0_H = 0;                           

 

  while (1);

}

 

Is my measured current value valid?

 

Regards,

Uchida-k

  • Hi Uchida,

    Please take a look at Section 5.4 and Table 5-5 from the datasheet. Referring to these, your number of 369uA seems reasonable. Let me know if you have any further questions.

    Best regards,

    Caleb Overbay

  • Hello Uchida-k,

    HFXT current consumption is 75 uA for 4 MHz crystals according to Table 5-5 of the datasheet, and active mode current consumption at 1 MHz is around 200 MHz (Section 5.4). The VLO also consumes 100 nA (Table 5-7) but this value is null, the remaining current is most likely explained by your LaunchPad connections and the execution of EnergyTrace in your debugger. Please refer to SLAA650 and SLAA603 for more information.

    Regards,
    Ryan

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