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CC254x POwer Savings and 32KHz XO Accuracy

One of the CC254x support documents suggests using a 32.768 kHz external oscillator with 40 ppm frequency accuracy to achieve aggressive power savings.  Is there a measure of the attainable power savings if a higher accuracy 32.768 kHz oscillator was used?

 I was planning on getting access to a 5 ppm 32.768 kHz XO (SiT1552) if the additional cost of using this XO will result in extending battery life in our medical activity monitor device.

Will appreciate some guidance on this approach and other related power saving schemes.

Thanks.

-JP

  • Hi Jehangir,

    The savings that can acheived really depends on how long intervals you will sleep in PM2. For very long sleep times, the more accurate xtal can provide measurable savings provided that the stack is optimized for it.

    Please make sure you take aging into account as well with the xtal ppm.

    Peder

  • Hi Peder,

    Thanks for the quick response.  You do make a good point about aging -  I'll take this in to consideration. 

    Is there any documentation you can point me to that will allow me to quantify the power savings for specific PM2 sleep times with a 5 ppm XO? 

    Any help in optimizing the stack to take advantage of the higher accuracy 32 kHz clock will be appreciated.

    Thanks,

    -JP