• State
  • Locked Locked
  • Replies 5 replies
  • Subscribers 43 subscribers
  • Views 1724 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

CC3200 battery performance evaluation

Srinath Vaddepally1
Expert 1020 points

Other Parts Discussed in Thread: CC3200

Hi,

I am trying to evaluate the CC3200 performance  with a 800mAh Li Po battery. My understanding of this battery capacity is that, Li Po can supply 800mA / sec for up to 3600 sec.

Now CC3200 Spec says ..

" Calibration is performed sparingly, typically when coming out of Hibernate and only if temperature has changed by more than 20°C or the time elapsed from prior, calibration is greater than 24 hours "

Considering 


Calibration peak currents 700mA  (Worst case scenario)

MCU active / MCU Sleep / MCU LPDS  TX ~~ 270 mA & RX ~~60mA (approximate numbers) , Total power consumption ~~ 350mA 

=> 20 transactions  / day = 20 x 350mA = 700 x 10mA 

Total power consumption / day =  700 x 11mA  (and calibration is done for every 24 hours). Ignoring leakage currents and idle currents

idealy 800mAH capacity Li Po battery should  last for  ( 850 x 3600) / ( 700 x 11mA0  ~~375 days i.e year.

Can you please correct if I am wrong on these numbers ? Appreciate your response on this.


Thanks,

Srinath

 

  • 0
    Expert 1020 points

    Hi,

    In above calculations, I just considered Tx / Rx power consumption & Calibration currents. Is there any thing else, should I worry about in estimating the CC3200 battery performance.

    Please advise.

    Thanks,

    Srinath

  • 0 in reply to Srinath Vaddepally1
    Prodigy 190 points

    I have roughly the same choices to make as you but with a CC3000. I'd like to use a primary cell but when I look at the peak currents (over 200mA) this doesn't look like a runner.

    What I do see is that self discharge rates for a LiPo battery could reduce your calculations significantly so you should consider those too. The information seems to say "very good self discharge rates of 3% per month" but in our usage scenarios that's still a loss of 36%/year!

  • 0 in reply to Srinath Vaddepally1
    TI__Intellectual 1630 points

    Srinath,

    You are right that for lifetime evaluation you should consider your battery capacity and your average current.

    I am afraid that your average current calculation is a bit simplified.

    When considering a current profile, you should consider the different current levels for different operating modes and also the amount of time spent in each mode (hibernate, sleep, TX, RX, etc'). If you have a repetitive use case for example, every one hour you hibernate for 59min and then exit hibernate, connect, transmit, receive, etc' you may calculate the average current for single cycle.

    Since calibration happens only once a day (assuming temperature is mostly stable), its contribution over battery lifetime in any usecase is not significant. You should make sure that the system can supports the calibration peak current.

    Regards

    Ben 

  • 0 in reply to Ben Gilboa
    Prodigy 10 points

    Hi ，Ben

        I want to kown why the cc3200 have to calibration itself, what had happened while calibration,?

    thanks for your support.

  • 0 in reply to zhjun chu
    Intellectual 680 points
    Hi All,

    What happen when calibration takes place? and at which stage it will happen?

    Thanks & Regards
    Santhoj