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Can i use only a carrier to wake up CC1101?

Ushan Karunathilaka
Intellectual 695 points
Other Parts Discussed in Thread: CC1101

Hello TI experts,

I m using CC1101 in my design and i want it to wake up during WOR mode.

I m using GFSK modulation.

Can i wake it up by only transmitting a carrier,

if YES, how to set the CC1101 to transmit only a carrier?

Thanks,

Ushan

  • 0
    TI__Mastermind 18780 points

    Hi,

    Yes you can wake you from WOR with a carrier transmitted. I am however not sure what you will gain on this, what is your application? To get the correct settings for how to send a carrier with the cc1101, I recommend using SmartRF Studio. Under the Contineous TX tab, you can choose an unmodulated carrier.

  • 0 in reply to CHS
    Intellectual 695 points

    Hi,

    I have tried unmodulated using smartRFstudio and WOR was working perfectly. however there is an drawback of this.

    it wakes up if there is an activity in closer channel. 

    I m using default setting (38.4k maximum sensitivity) provided by SmartRFStudio and base frequecy is 903Mhz and channel is 9.

    it wakes up if there is a transmission in channel 12.

    in order to minimize false wake up, i configure the GDIO to wake up if there is a sync word match.

    now there are no false alarms however , it takes lot of time to wake it up.

    is there any way to transmit only the two byte preamble and sync word?

  • 0 in reply to Ushan Karunathilaka
    TI__Mastermind 18780 points

    If you use synchronous serieal mode (for settings, see the continuous TX tab in smartRF studio), you can send exaclty what you want, also tow byte preamble and a sync word.  If you use packet/FIFO mode you will need to add a dummy byte in the FIFO to send more than just preamble.

     

    Charlotte

  • 0 in reply to CHS
    Intellectual 695 points

    Thanks CHS,

    One more thing regarding WOR.

    It would be good if i can wake the individual devices selectively. therefore what i did was that i used a unique sync word per node in my star network (I have maximum of 256 nodes in one star cluster)

    If a perticular node has to be woken up, preamble and sync word of that node will be transmitted by the host. 

    I found that this is working properly.

    is this a good practice?

    Thanks,

    Ushan

  • 0 in reply to Ushan Karunathilaka
    TI__Mastermind 18780 points

    Hi,

    I would not recommend this solution no, as you will then get many non-optimal sync words. I would rather recommend adding one more byte and use adress filtering.

     

    Charlotte