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CC3200 Power Supply / Battery Question

Philip Kristament
Prodigy 220 points
Other Parts Discussed in Thread: CC3200

With a specific wearable device which absolutely MUST use WiFi as opposed to Bluetooth Low Energy I keep on coming up against power supply issues for the CC3200. Whereas I know I can definately use 3 X AAA Alkaline batteries to power the device as they output sufficient peak current to allow for the peak calibration current with VBAT of 3.3V = 450 mA for 24 ms, and the TX with power level of 0 = 272 mA, I'd much rather use a single Lithium-ion battery.

Problem eees, they appear from my research to not put out sufficient peak current.

The rational solution would be to have a capacitor on the other side of my planned buck/boost that would not only smooth the power supply but also provide for the necesssary peak current requirements.

However with my very limited knowledge of such things I arrived at a capacitor of 36 mF minimum.  All very well until I went looking for one.  I found a 10,000 Uf at Digikey of which I would need four.  They only cost U.S $230 for one of them.  Droopy ears ensued.  Not only kills the idea from a cost perspective but their huge into the bargain.

Is it the case that I have missed something that would allow me to use my desired single cell Lithium-ion battery or am I stuck with 3 AAA's?

Any input would be greatly appreciated.

  • 0
    TI__Guru 58035 points

    Hello Philip,

    Are you trying to use the 3.6V Lithium ion battery that are used in mobile phones? They should be able to handle the peak currents required by CC3200. Could you provide more details on the battery?

    Regards,

    Dham

  • 0 in reply to Vivek Dham
    Prodigy 220 points

    Thankyou Vivek,

    You have eased a worried mind.

    As for your question vis a vis more details on the battery.  It is somewhat complicated.  Whereas origionally I had a business plan, design, software requirements etc with only one piece of electronics that required so much capacity I was waiting for Flexible Lithium-ion batteries to come on the market (“Ian M. Ward, et al., Journal of Power Sources 162(2006) 818-822.”), I now have two bits of kit, one of which will make do with the standard 1800 to 2000 mAH.

    So a cellphone battery is perfect as long as I can convince a suitable manufacturuer to include a TI Gas Gauge and associated circuitry in a custom made battery.  For this I must wait for the capital rasing side of things to be completed.  In the meantime I will continue as if things will work with a standard 3.7V cellphone-type Lithium-ion battery.

    Thanks once again.

  • 0 in reply to Philip Kristament
    TI__Guru 58035 points

    Thanks for sharing the details Philip.

    Using the flexible Lithium battery would be very interesting.

     

    Regards,

    Dham