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CC1310: How to set the frequency below 430MHz?

jack chen2
Expert 1240 points

Part Number: CC1310

Hi All,

My test hardware is CC1350-4 Launchpad, I want to test the frequency setting of 420 to 430 Mhz.

When I use SmartRF studio7, If set to 430 Mhz, it will display a warning color in the frequency field, but the radio still worked.

If the frequency setting is lower than 429Mhz, the radio does not work.

After check the settings on smartRF studio, the IoDivider is different. Is there any override command should add to the settings?

BR,

Jack

  • 0
    Guru 26200 points
    Hello Jack,

    datasheet shows the device characteristics for a range from 431 MHz to 527 MHz.
    Everything out out of this range is out of specification and is not supported.
    You can deal with RF setup to try to set frequencies out of this range.
    The lowest possible frequency you can calculate according to setup information provided within www.ti.com/.../swcu117h.pdf
  • 0
    TI__Mastermind 39860 points
    You need to set the divider to 12. In the override editor change the following 0x18000280 to 0x18000180. This sets the LO divider to 12.

    Later revision of Studio will set the LO divider to the correct value also for frequencies below 431 MHz.

    If you use the code export you should change to
    // Synth: Set divider bias to disabled
    HW32_ARRAY_OVERRIDE(0x405C,1),
    // Synth: Set divider bias to disabled (specific for loDivider=12)
    (uint32_t)0x18000180,