CC1021-RTR1 datasheet(75/92 Pages) TI

75 / 92 page

CC1021

SWRS045

Page 75 of 91

VGA3 Register (13h)

NAME

Default

value

Active

Description

VGA3[7:5]

VGA_DOWN[2:0]

Decides how much the signal strength must be above

CS_LEVEL+VGA_UP before VGA gain is decreased.

0: Gain is decreased 4.5 dB above CS_LEVEL+VGA_UP

1: Gain is decreased 6 dB above CS_LEVEL+VGA_UP

6: Gain is decreased 13.5 dB above CS_LEVEL+VGA_UP

7: Gain is decreased 15 dB above CS_LEVEL+VGA_UP

See Figure 20 on page 39 for an explanation of the

relationship between RSSI, AGC and carrier sense settings.

VGA3[4:0]

VGA_SETTING[4:0]

VGA setting to be used when receive chain is turned on

This is also the maximum gain that the AGC is allowed to use.

See Figure 20 on page 39 for an explanation of the

relationship between RSSI, AGC and carrier sense settings.

VGA4 Register (14h)

NAME

Default

value

Active

Description

VGA4[7:5]

VGA_UP[2:0]

Decides the level where VGA gain is increased if it is not

already at the maximum set by VGA_SETTING.

0: Gain is increased when signal is below CS_LEVEL

1: Gain is increased when signal is below CS_LEVEL+1.5 dB

6: Gain is increased when signal is below CS_LEVEL+9 dB

7: Gain is increased when signal below CS_LEVEL+10.5 dB

See Figure 20 on page 39 for an explanation of the

relationship between RSSI, AGC and carrier sense settings.

VGA4[4:0]

CS_LEVEL[4:0]

Reference level for Received Signal Strength Indication

(carrier sense level) and AGC.

See Figure 20 on page 39 for an explanation of the

relationship between RSSI, AGC and carrier sense settings.

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