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CC1101: 433 MHz SmartRF Settings

Ulf Knoblich
Intellectual 415 points
Other Parts Discussed in Thread: TEST2, CC1101

Hi,

is there anything to consider when using SmartRF to generate 433 MHz Settings? We just use the 868 MHz setting and just change the frequency to 433 MHz. But as e.g. the FREQ_IF register is not changed (and we see strange behavior in RX) in wonder if this the correct way to generate the settings.

Regards

Ulf

  • 0
    TI__Mastermind 39860 points
    You are correct. Use one of the "typical setting" 868 MHz settings and simply change the RF frequency to 433 MHz. If your system parameters are not covered by one of the "typical settings" choose the setting with the RX filter BW closest (upwards) to the one you intend to use and then change data rate, deviation, etc.. Reason is that only those registers that are calculated based on your manual entry (e.g MDMCFG when changing data rate and RX filter BW) will change. FREND1, AGCCTRLx, FSCTRL1 and a few other registers settings are not calculated by SmartRF Studio, but they still need to be set according to the RX BW used.

    What you need to do is to select the "typical setting", which closest matches the RX filter BW you are going to use as the FREND1, AGCCTRL, FSCTRL1, TEST2, TEST1, and FIFOTHR settings to use depend on the RX BW. As an example, assuming the desired RX BW is 162.5 kHz you should start with the the 76.8 kbps preferred setting (232 kHz RX BW) and change the data rate, deviation, RX BW, and modulation format manually you get the right settings.
  • 0 in reply to Sverre
    Intellectual 415 points
    Thank you Sverre,
    just for completeness: could you also comment on FREQ_IF? By reading the manual i am not sure if FREQ_IF is either an absolute or relative value...
    Ulf
  • 0 in reply to Ulf Knoblich
    TI__Guru**** 317180 points

    FREQ_IF is independent of frequency band.

    What "strange" things did you see in Rx since you ask?

  • 0 in reply to TER
    Intellectual 415 points
    Hi,
    we are facing problems with a chinese radio module using the cc1101 and see a large variance regarding link quality even if the modules are OK when doing conducted measurements. We will do further tests in order to seperate potential software problems first. No further questions so far, you can close this thread.
    Thanks