CC1020-RTR1 datasheet(33/95 Pages) TI1

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CC1020

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SWRS046H – NOVEMBER 2006 – REVISED MARCH 2015

0.5 ms of delay between each RSSI read.

12. Write XP – 2 × DX to PHASE_COMP register.

13. Wait at least 3 ms. Measure signal strength Y0 as filtered average of 8 reads from RSSI register with

0.5 ms of delay between each RSSI read.

14. Set AP = 2 × (Y0 – Y2 + Y4) – (Y1 + Y3).

15.

If AP > 0 then

set DP = ROUND ( 7 × DX × (2 × (Y0 – Y4) + Y1 – Y3) / (10 × AP))

else

if Y0 + Y1 > Y3 + Y4 then

set DP = DX

else

set DP = –DX.

16.

If DP > DX then

set DP = DX

else

if DP < –DX then set DP = –DX.

17. Set XP = XP + DP.

18. Write XP to PHASE_COMP register.

19.

If XG + 2 × DX < 127 then

write XG + 2 × DX to GAIN_COMP register

else

write 127 to GAIN_COMP register.

20. Wait at least 3 ms. Measure signal strength Y4 as filtered average of 8 reads from RSSI register with

0.5 ms of delay between each RSSI read.

21. Write XG + DX to GAIN_COMP register.

22. Wait at least 3 ms. Measure signal strength Y3 as filtered average of 8 reads from RSSI register with

0.5 ms of delay between each RSSI read.

23. Write XG to GAIN_COMP register.

24. Wait at least 3 ms. Measure signal strength Y2 as filtered average of 8 reads from RSSI register with

0.5 ms of delay between each RSSI read.

25. Write XG – DX to GAIN_COMP register.

26. Wait at least 3 ms. Measure signal strength Y1 as filtered average of 8 reads from RSSI register with

0.5 ms of delay between each RSSI read.

27. Write XG – 2 × DX to GAIN_COMP register.

28. Wait at least 3 ms. Measure signal strength Y0 as filtered average of 8 reads from RSSI register with

0.5 ms of delay between each RSSI read.

29. Set AG = 2 × (Y0 – Y2 + Y4) – (Y1 + Y3).

30.

If AG > 0 then

set DG = ROUND (7 × DX × (2 × (Y0 – Y4) + Y1 – Y3) / (10 × AG)

else

if Y0 + Y1 > Y3 + Y4 then

set DG = DX

else

set DG = –DX.

31.

If DG > DX then

set DG = DX

else

if DG < –DX then set DG = –DX

32. Set XG = XG + DG.

33. If DX > 1 then go to step 2.

34. Write XP to PHASE_COMP register and XG to GAIN_COMP register.

If repeated calibration gives varying results, try to change the input level or increase the number of RSSI

reads N. A good starting point is N = 8. As accuracy is more important in the last fine-calibration steps, it

can be worthwhile to increase N for each loop iteration.

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