CC113LRGPR datasheet(34/86 Pages) TI1

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CC113L

SWRS108B – MAY 2011 – REVISED JUNE 2014

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5.12.3.1 CS Absolute Threshold

The absolute threshold related to the RSSI value depends on the following register fields:

•

AGCCTRL2.MAX_LNA_GAIN

•

AGCCTRL2.MAX_DVGA_GAIN

•

AGCCTRL1.CARRIER_SENSE_ABS_THR

•

AGCCTRL2.MAGN_TARGET

For given AGCCTRL2.MAX_LNA_GAIN and AGCCTRL2.MAX_DVGA_GAIN settings, the absolute

threshold can be adjusted ±7 dB in steps of 1 dB using CARRIER_SENSE_ABS_THR.

The MAGN_TARGET setting is a compromise between blocker tolerance/selectivity and sensitivity. The

value sets the desired signal level in the channel into the demodulator. Increasing this value reduces the

headroom for blockers, and therefore close-in selectivity. It is strongly recommended to use SmartRF

Studio SWRC176 to generate the correct MAGN_TARGET setting. Table 5-11 show the typical RSSI

readout values at the CS threshold at 2.4 kBaud and 250 kBaud data rate respectively. The default reset

value for CARRIER_SENSE_ABS_THR = 0 (0 dB) has been used. MAGN_TARGET = 3 (33 dB) and 7

(42 dB) have been used for 2.4 kBaud and 250 kBaud data rate respectively. For other data rates, the

user must generate similar tables to find the CS absolute threshold.

Table 5-10. Typical RSSI Value in dBm at CS Threshold with MAGN_TARGET = 3

(33 dB) at 2.4 kBaud, 868 MHz

MAX_DVGA_GAIN[1:0]

000

–97.5

–91.5

–85.5

–79.5

001

–94

–88

–82.5

–76

010

–90.5

–84.5

–78.5

–72.5

011

–88

–82.5

–76.5

–70.5

MAX_LNA_GAIN[2:0]

100

–85.5

–80

–73.5

–68

101

–84

–78

–72

–66

110

–82

–76

–70

–64

111

–79

–73.5

–67

–61

Table 5-11. Typical RSSI Value in dBm at CS Threshold with MAGN_TARGET = 7

(42 dB) at 250 kBaud, 868 MHz

MAX_DVGA_GAIN[1:0]

000

−90.5

−84.5

−78.5

−72.5

001

−88

−82

−76

−70

010

−84.5

−78.5

−72

−66

011

−82.5

−76.5

−70

−64

MAX_LNA_GAIN[2:0]

100

−80.5

−74.5

−68

−62

101

−78

−72

−66

−60

110

−76.5

−70

−64

−58

111

−74.5

−68

−62

−56

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