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CC1310: TX Power Setting when using 1190

VICTOR VALENCIA
Expert 1070 points
Part Number: CC1310
Other Parts Discussed in Thread: CC1190,

I am trying to get a better understanding of how the output power is configured using the 1310/1190

combination.  The 1190 data sheet indicates that the maximum input power is 10 dBm.  It also

indicates that with HGM true and an input power of 5 dBm the output power is 26.5 dBm.

If I use RF Studio and configure for LAUNCHXL-CC1310-CC1190-US and look at the exported code

I see that .txPower in CMD_PROP_RADIO_DIV_SETUP is set to a value of 0x00CE.  Is it

true that this value equates to a 1310 output power of 5 dBm (since this is the input required for 26.5 dBm output

from the 1190)?

If that's true then why is the exported .txPower value set to 0x18C6 if I choose the 1310-alone configuration with 5 dBm output

power?

  • 0
    TI__Guru**** 317180 points
    Note that the SAW filter used gives ~3 dB loss meaning that you can't look directly at the CC1310 power settings to find the input power on CC1190. The txpower numbers are a result of measurements and should be used.
  • 0 in reply to TER
    Expert 1070 points
    Hi TER,

    That's good to know. If we wanted to perform the same measurements on our system to determine
    the optimal values (assuming they are different than TI's) would I go about that?

    What's really confusing to me is how to determine the txPower values that equate to the 1310
    output power. Is there a description of the encoding of the txPower value?

    Victor
  • 0 in reply to VICTOR VALENCIA
    TI__Guru**** 317180 points
    This thread: e2e.ti.com/.../612071 describe txpower.

    Note that for CC1190, full temperature compensation is not possible due to how the PAs are designed so in the txpower settings provided for CC1310-CC1190, temp comp is turned off.