CC1021-RTR1 datasheet(70/91 Pages) TI1

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Not Recommended for New Designs NRND

CC1021

SWRS045D – JANUARY 2006 – REVISED JANUARY 2015

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Table 5-38. VGA4 Register (14h)

DEFAULT

NAME

ACTIVE

DESCRIPTION

VALUE

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 5-17 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 5-17 for an explanation of the relationship between RSSI,

AGC and carrier sense settings.

Table 5-39. LOCK Register (15h)(1)

DEFAULT

NAME

ACTIVE

DESCRIPTION

VALUE

LOCK[7:4]

LOCK_SELECT[3:0]

—

Selection of signals to LOCK pin

0: Set to 0

1: Set to 1

2: LOCK_CONTINUOUS (active low)

3: LOCK_INSTANT (active low)

4: CARRIER_SENSE (RSSI above threshold, active low)

5: CAL_COMPLETE (active low)

6: SEQ_ERROR (active low)

7: FXOSC

8: REF_CLK

9: FILTER_CLK

10: DEC_CLK

11: PRE_CLK

12: DS_CLK

13: MODEM_CLK

14: VCO_CAL_COMP

15: F_COMP

LOCK[3]

WINDOW_WIDTH

—

Selects lock window width

0: Lock window is 2 prescaler clock cycles wide

1: Lock window is 4 prescaler clock cycles wide

Recommended setting: WINDOW_WIDTH=0.

LOCK[2]

LOCK_MODE

—

Selects lock detector mode

0: Counter restart mode

1: Up/Down counter mode

Recommended setting: LOCK_MODE=0.

LOCK[1:0]

LOCK_ACCURACY[1:0]

—

Selects lock accuracy (counter threshold values)

0: Declare lock at counter value 127, out of lock at value 111

1: Declare lock at counter value 255, out of lock at value 239

2: Declare lock at counter value 511, out of lock at value 495

3: Declare lock at counter value 1023, out of lock at value 1007

(1)

Set LOCK_SELECT=2 to use the LOCK pin as a lock indicator.

Detailed Description

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