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CC430F5137: LPM3 XT1 and VLO Mode Power Consumption

servet ayok
Prodigy 95 points
Part Number: CC430F5137

Hello,

In CC430F5137 datasheet, it is written that current consumption in LPM3 XT1 mode is 2uA and in LPM3 VLO mode is 1.1uA for PMMCOREV = 0 (Page 20). We verified it.

However, it is also written that XT1 current consumption is 75nA at lowest drive setting.

So, why is there 0.9uA difference between LPM3 XT1 and LPM3 VLO modes since XT1 only consumes 75nA? What is the source of 825nA?

Is there a way to further reduce current consumption in LPM3 XT1 mode?

Regards.

  • 0
    TI__Mastermind 49692 points

    Hello,

    The difference in current consumption is most likely due to the extra circuitry required for operating the XT1, such as the integrated load capacitors, oscillator fault detection, etc. Keep in mind that the VLO operates at a lower frequency of approximately 10kHz and doesn't have fault detection circuitry. To achieve the lowest current consumption in LPM3 using XT1, you'll want to use the lowest drive strength possible for the selected effective load capacitance. Please see Footnote 4 on page 27 in the datasheet for the recommended settings versus load capacitance.

    MSP430 Workshop Series 7 of 12 - Low-Power Optimization

    Regards,

    James