SWRA682 December   2020 CC1310 , CC1312PSIP , CC1312R , CC1314R10 , CC1350 , CC1352P , CC1352P7 , CC1352R

 

  1.   Trademarks
  2. 1 Introduction
  3. 2 Recommended Test Setup
  4. 3 Overrides
  5. 4 Find the Needed RX BW
  6. 5 How to Set the Deviation
  7. 6 Theoretical Sensitivity
  8. 7 Determine AGC_REF Level
  9. 8 Determine Anti-Aliasing BW
  10. 9 Determine PA Ramp Settings
  11. 10Intermediate Frequency (IF)
  12. 11LNA Ib Offset
  13. 12Sensitivity and Selection of Sync Word
  14. 13Narrowband
    1. 13.1 Frequency Offset Tolerance
    2. 13.2 Low Datarate
    3. 13.3 Phase Noise
  15. 14RSSI Offset

14 RSSI Offset

The RSSI value calculated by the chip has to be adjusted by an offset to give out a number that represents the input power in dBm.

To find the RSSI offset: Set the radio in RX. Apply a CW where the power in to the chip is stepped from -130 dBm to 10 dBm in 1 dB step. For each step, read the RSSI value using the RF_getRssi() function. It is recommended to do the measurements on several boards since the RSSI results have some chip to chip variation.

The RSSI offset is set by the following override:

(uint32_t)0x00XX88A3

where XX is the offset in two’s complement.

The RSSI offset is measured and given as an override for the settings given in SmartRFStudio. Using a different RF frontend than for the board the settings are measured for could change the RSSI offset. A typical example is if a Front End Module (FEM) is added since the LNA in the FEM adds gain.