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Keyfob battery

sriram hariharan
Prodigy 20 points

Other Parts Discussed in Thread: CC2540

Hello,

My keyfob battery lasted only 2 days and had to be replaced. I flashed the default keyfob hex file and did a few connect/disconnect tests. Isn't battery supposed to last a few months atleast ?

Thanks
Sriram

 

  • 0
    Expert 1890 points

    Did you left the cc debugger on it owernight?

    I had the same problem till I noticed that with cc debugger connected (even if cc debugger is not powered) drains 10-20x or even more power than without it. 

    So expect heavy power usage when you use that debugger - the battery solution is not too good for development, I've already replaced it with a normal 3.2V source ...

     

  • 0 in reply to Barna Csenteri
    TI__Expert 4060 points

    That sounds like a likely cause. When the debugger is connected, the CC2540 is prevented from entering it's sleep states (PM1, PM2, PM3), and therefore it draws a current in the mA range rather than the uA range.

    Good idea to use another power source if you are using the debugger a lot.

    Karl