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CC1110 at 400 MHz with example_sw_swrc088c

berry mccormick
Prodigy 20 points
Other Parts Discussed in Thread: CC1101

I have a CC1110EM version 1.11 (433MHz) and a SmartRF04EB version 1.9.  I downloaded and compiled the example_sw_swrc088c code.  I need to run the CC1110 in the 400-406 MHz Met Band, but when I edit the smartrf_CC1110.h file with the values for FREQ2-FREQ0, the CC1110EM doesn't want to go below 415MHz. 

 

Anything above 415 MHz works just as it should, and anything below 415 MHz gives me 415 MHz out.  That is true until you program it with less than 364MHz, at which point it works as it should in the low frequency band.

 

If I program the CC1110EM using Smart RF studio, I can get the board to operate at 400 MHz.  However, if I copy that file (export the register settings from Smart RF studio) and pit it in place of the smartrf_CC1110.h file, the system will come up at 415 MHz.

 

Any clues?

 

 

  • 0
    TI__Mastermind 39860 points

    I guess you only changed FREQ2-0. You also need to set TEST0 to 0x0B when operating at 402 MHz. You get the right settings from SmartRF Studio.

     

    There are 2 VCO's in the CC1101 and which one to use depends on the RF frequency.

    When TEST0.VCO_SEL_CAL_EN = 0 the user selects which VCO to use through FSCAL2.VCO_CORE_H_EN.  

    When TEST0.VCO_SEL_CAL_EN = 1 the CC1101 automatically selects which VCO to use (and this is always the lower VCO). FSCAL2.VCO_CORE_H_EN is then don’t care

     

    Freq. range 300 - 348

    freq >= 322.88    =>    TEST0.VCO_SEL_CAL_EN = 0    &    FSCAL2.VCO_CORE_H_EN = 1

    freq < 322.88     =>    TEST0.VCO_SEL_CAL_EN = 1    &    FSCAL2.VCO_CORE_H_EN = don’t care (Studio uses 1)                       

    Freq. range 400- 464

    freq >= 430.5     =>    TEST0.VCO_SEL_CAL_EN = 0    &    FSCAL2.VCO_CORE_H_EN = 1

    freq < 430.5      =>    TEST0.VCO_SEL_CAL_EN = 1    &    FSCAL2.VCO_CORE_H_EN =  don’t care (Studio uses 1)     

     Freq. range 800- 928

    freq >= 861     =>    TEST0.VCO_SEL_CAL_EN = 0    &    FSCAL2.VCO_CORE_H_EN = 1

    freq < 861      =>    TEST0.VCO_SEL_CAL_EN = 1    &    FSCAL2.VCO_CORE_H_EN =  don’t care (Studio uses 1)

  • 0 in reply to Sverre
    Prodigy 20 points

    Sverre,

    That did it.

    Thanks,

     

    Berry