CC2500-RTR1 datasheet(76/99 Pages) TI1

76 / 99 page

CC2500

SWRS040C

Page 76 of 89

0x1C: AGCCTRL1 – AGC Control

Bit

Field Name

Reset

R/W

Description

Reserved

AGC_LNA_PRIORITY

R/W

Selects between two different strategies for LNA and LNA2

gain adjustment. When 1, the LNA gain is decreased first.

When 0, the LNA2 gain is decreased to minimum before

decreasing LNA gain.

5:4

CARRIER_SENSE_REL_THR[1:0]

0 (00)

R/W

Sets the relative change threshold for asserting carrier

sense.

Setting

Carrier sense relative threshold

0 (00)

Relative carrier sense threshold disabled

1 (01)

6 dB increase in RSSI value

2 (10)

10 dB increase in RSSI value

3 (11)

14 dB increase in RSSI value

3:0

CARRIER_SENSE_ABS_THR[3:0]

(0000)

R/W

Sets the absolute RSSI threshold for asserting carrier

sense. The 2’s complement signed threshold is programmed

in steps of 1 dB and is relative to the MAGN_TARGET

setting.

Setting

Carrier sense absolute threshold

(Equal to channel filter amplitude when AGC

has not decreased gain)

-8 (1000)

Absolute carrier sense threshold disabled

-7 (1001)

7 dB below MAGN_TARGET setting

…

-1 (1111)

1 dB below MAGN_TARGET setting

0 (0000)

At MAGN_TARGET setting

1 (0001)

1 dB above MAGN_TARGET setting

…

7 (0111)

7 dB above MAGN_TARGET setting

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