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SX1231
WIRELESS & SENSING PRODUCTS
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time is very short, taking only 2 bit periods. The RSSI sampling must occur during the reception of preamble in FSK, and
constant “1” reception in OOK.
Notes - RssiValue can only be read when it exceeds RssiThreshold
- RssiStart command and RssiDone flags are not usable when DAGC is turned on, see section 3.5.4.
- The receiver is capable of automatic gain calibration, in order to improve the precision of its RSSI measurements.
This function injects a known RF signal at the LNA input, and calibrates the receiver gain accordingly. This
calibration is automatically performed during the PLL start-up, making it a transparent process to the end-user
- RSSI accuracy depends on all components located between the antenna port and pin RFIO, and is therefore
limited to a few dB. Board-level calibration is advised to further improve accuracy
RSSI Chart - With AGC
0.0
-20.0
-40.0
-60.0
-80.0
-100.0
-120.0
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
Pin [dBm]
Figure 9. RSSI Dynamic Curve
3.5.10. Cordic
The Cordic task is to extract the phase and the amplitude of the modulation vector (I+j.Q). This information, still in the
digital domain is used:
?
?
Phase output: used by the FSK demodulator and the AFC blocks.
Amplitude output: used by the RSSI block, for FSK demodulation, AGC and automatic gain calibration purposes.
Real-time
Q(t)
Magnitude
Real-time Phase
I(t)
Figure 10. Cordic Extraction
Rev. 7 - June 2013
Page 30
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