CC113LRGPR datasheet(32/87 Pages) TI2

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channel

RSSI

FILTER _ LENGTH

2 BW

8 2

CC113L

SWRS108B – MAY 2011 – REVISED JUNE 2014

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5.12 Received Signal Qualifiers and RSSI

CC113L has several qualifiers that can be used to increase the likelihood that a valid sync word is

detected:

•

Sync Word Qualifier

•

RSSI

•

Carrier Sense

5.12.1 Sync Word Qualifier

If sync word detection is enabled in the MDMCFG2 register, the CC113L will not start filling the RX FIFO

and perform the packet filtering described in Section 5.10.2 before a valid sync word has been detected.

The sync word qualifier mode is set by MDMCFG2.SYNC_MODE and is summarized in Table 5-8. Carrier

sense described in Section 5.12.3.

Table 5-8. Sync Word Qualifier Mode

MDMCFG2.SYNC_MODE

Sync Word Qualifier Mode

000

No preamble/sync

001

15/16 sync word bits detected

010

16/16 sync word bits detected

011

30/32 sync word bits detected

100

No preamble/sync + carrier sense above threshold

101

15/16 + carrier sense above threshold

110

16/16 + carrier sense above threshold

111

30/32 + carrier sense above threshold

5.12.2 RSSI

The RSSI value is an estimate of the signal power level in the chosen channel. This value is based on the

current gain setting in the RX chain and the measured signal level in the channel.

In RX mode, the RSSI value can be read continuously from the RSSI status register until the demodulator

detects a sync word (when sync word detection is enabled). At that point the RSSI readout value is frozen

until the next time the chip enters the RX state.

NOTE

It takes some time from the radio enters RX mode until a valid RSSI value is present in the

RSSI register. See DN505 SWRA114 for details on how the RSSI response time can be

estimated.

The RSSI value is given in dBm with a ½-dB resolution. The RSSI update rate, fRSSI, depends on the

receiver filter bandwidth (BWchannel is defined in Section 5.8) and AGCCTRL0.FILTER_LENGTH.

(6)

If PKTLEN.APPEND_STATUS is enabled, the last RSSI value of the packet is automatically added to the

first byte appended after the payload.

Detailed Description

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