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MSP430G2444 low power mode

hwteam skpp
Prodigy 120 points
Other Parts Discussed in Thread: MSP430G2444

Hi,

   I am using MSP430G2444 in my design. I want to run an internal timer in this device in LPM3 mode. Do i need to connect a 32.768Khz crystal to this device? If so where to connect, to the main crystal input (P2.7 and P2.6) or to any other pin? In normal operation it runs with internal oscillator.

  • 0
    TI__Guru 56650 points

    Hi,

    In LPM3, basically the ACLK is the only clock which will be active. Looking into the User's Guide, ACLK can be either source from an external oscillator at LFXT1, or internal VLOCLK.

    The MSP430G2444 has an internal VLO oscillator, it is basically low power-low cost internal oscillator but it has the drawbacks in the frequency precision (defined between 4-12 kHz) in the datasheet. So if your application doesn't need any precision timer, you can use the internal VLO.  There is also an app note for calibrating VLO clock: http://www.ti.com/lit/an/slaa340a/slaa340a.pdf

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