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CC1101 TX in OOK MOde

Jeff Yu
Expert 2110 points
Other Parts Discussed in Thread: CC1101

HI i SUCCEESS in TX/RX in GFSK MODE, however when switching to TX MODE, and using GDO0 as async. output, nothing out, 


i have a glance of the application note but only DN022 for it, anymore simple example of application note that can be useful, i read some post that say need to set PATABLE[1], however, i havenot seen such a hints in the CC1101 datasheet.

Thanks

Jeff

  • 0
    TI__Guru**** 317180 points
    I have read you post a few times and I'm still not sure what you are asking about. From the heading I assume you are trying to use CC1101 with OOK. To do this you have to write the Logic '1' value and the Logic '0' value into PATABLE(1:0) What other issues did you see?
  • 0 in reply to TER
    TI__Guru* 79441 points

    This is stated in the data sheet in section 24:

    "If OOK modulation is used, the logic 0 and logic 1 power levels shall be programmed to index 0 and 1 respectively."

    Remember that the PATABLE must be programmed in burst mode if you want to write to other entries than PATABLE[0].

    Siri

  • 0 in reply to Siri
    Expert 2110 points

    Hi thank yor all help.

    I finally was successful in using CC1101 to work in OOK/Ascyn. mode.

    While it comes in anyother question that is MY BOSS ask me have option to use TX in  WIDE/NARROW BAND( i guess OOK is not able to set that right?)

    Thanks

    Jeff

  • 0 in reply to Jeff Yu
    TI__Guru**** 317180 points

    OOK is normally used only for legacy products, one of the reasons is the poor spectral efficiency. If you want something that is narrowband you should use GFSK. It's also dependent on what you define as narrow-band since CC1101 is not a narrow band device. (Narrow band is typically defined as channels 12.5 kHz or 25 kHz wide.

    What is your overall spec?

  • 0 in reply to TER
    Expert 2110 points

    Thanks. Do you mean that the OOK only work on wideband ?

    Just to reassure because i was successful in setting the CC1101 in OOK & GFSK,

    and that in GFSK mode i can set the fdev and RX filter bandwidth to adjust it is wideband or narrowband( is it correct that the fdev and RX filter is the factor ?).

    While in OOK , i dunno why you say it is wideband?

    Hope that you can help.

    Thanks a lot

    Jeff

  • 0 in reply to Jeff Yu
    TI__Guru**** 317180 points

    What do you define as wideband and narrowband in your system?

  • 0 in reply to TER
    Expert 2110 points

    thanks for quick reply.

    narrowband: modulation bandwidth 3db from peak within 25kHz

    thanks

    Jeff

  • 0 in reply to Jeff Yu
    TI__Guru**** 317180 points

    With OOK you will not achieve this. A OOK spectrum is very wide with high side-lobes (it looks like a SINC).


    The signal bandwidth is set by modulation format, datarate and deviation. For FSK the signal bandwidth is datarate+2*deviation (conservative calculation), GFSK is narrower.