CC2500-RTR1 datasheet(70/84 Pages) TI

70 / 84 page

CC2500

PRELIMINARY Data Sheet (Rev.1.2)

SWRS040A

Page 70 of 83

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 LNA 2

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

When 0, the LNA 2 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-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

CC2500-RTR1 数据表(PDF) 70 Page - Texas Instruments

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