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Advertising Interval Power Consumption

Kevin Lockwood
Expert 1035 points

Other Parts Discussed in Thread: CC2540

I am using a CC2540.  By default the advertising interval is set to 100msec by Ti.  Meaning if Advertising is enabled for only 1 seconds, 10 total advertisements should go out on each channel.  This is 30 total advertisements in 1 second.  This seems excessively high for a default setting unless I'm completely missing something.   I notice that the Sniffer picks up 10 advertisements on each channel which verifies my earlier assertion.  It seems that this would lead to extremely high power consumption for somewhat default settings if advertising is enabled every 5~10seconds.  I feel like I must be missing something here with all the assertions of +1 year battery life.  I've read the app note on power consumption but it was related to connection events, not a full advertising interval across all three channels.  Can anyone chime in on proper modelling of an advertisement interval? Thanks for the help in advance guys.

  • 0
    Mastermind 8695 points

    What device are you asking about? It seems like you understand everything well, but you want to know standard practices. 

  • 0 in reply to Peter Borenstein
    Expert 1035 points

    Sorry, I should have included that.  I am using a CC2540.   I am trying optimize the power consumption of a project I have inherited.   I was trying to model the power consumption of a device simply left to advertise, but as I developed my model it seems to suggest much high power consumption then I observe in real application.  Therefore figured I had made some wrong assumptions in my model.  

  • 0 in reply to Kevin Lockwood
    Mastermind 8695 points

    Oh sorry. I assumed you were using a TI device (sensor tag or keyfob) since you mentioned the TI apps. Lowering the advertising interval and packet size saves power, but I assume you already know that. What's interesting is that the majority of the power consumed isn't in sending off the packets, but the amount of time that the core is on. Unfortunately the advertisement process seems to be a black box.

    I'm eager to hear what TI has to say.