CC1010-RTR1 datasheet(114/152 Pages) TI

114 / 152 page

CC1010

SWRS047

Page 114 of 152

the result of the calibration is stored in the

TEST0 (VCO capacitance array setting)

and TEST2 (Charge pump current setting)

registers. The access of these registers

depend on the RFMAIN.F_REG bit as

there are two physical registers mapped to

the same address, one for frequency A

and one for frequency B. The calibration

result can be read back from TEST0 and

TEST2,

and

later

written

back

TEST5.VCO_AO(3:0)

and

TEST5.CHP_CO(4:0)

respectively.

TEST5.VCO_OVERRIDE

and

TEST6.CHP_OVERRIDE must be set in

order to make the override values to take

effect.

The rest of the TESTn registers are not

needed for normal operation of

CC1010, but

are included here for completeness.

CAL (0xE5) - PLL Calibration Control Register

Bit

Name

R/W

Reset value

Description

CAL_START

R/W

↑ 1 : Calibration started

0 : Calibration inactive

Calibration is started after a positive transition on

CAL_START. CAL_START must manually be

written to 0 after calibration is complete (read the

CAL_COMPLETE flag)

CAL_DUAL

R/W

1 : Store calibration in both A and B (dual

calibration)

0 : Store calibration in A or B defined by

RFMAIN.F_REG

CAL_WAIT

R/W

1 : Normal Calibration Wait Time (Recommended)

0 : Half Calibration Wait Time

The calibration time is proportional to the internal

reference frequency fREF. See the main text.

CAL_CURRENT

R/W

1 : Calibration Current Doubled

0 : Normal Calibration Current (Recommended)

CAL_COMPLETE

Status bit which is set when the calibration is

complete

2:0

CAL_ITERATE

R/W

101

Iteration start value for calibration DAC

000 - 101: Not used

110 : Normal start value

111 : Not used

TEST6 (0xFF) – PLL Test Register 6

Bit

Name

R/W

Reset value

Description

LOOPFILTER_TP1

R/W

Testpoint 1 select

0 : CHP_OUT tied to GND

1 : Select testpoint 1 to CHP_OUT

LOOPFILTER_TP2

R/W

Testpoint 2 select

0 : CHP_OUT tied to GND

1 : Select testpoint 2 to CHP_OUT

CHP_OVERRIDE

R/W

Charge pump current override enable

0 : use calibrated value. Used in RX mode

1 : use CHP_CO[4:0] value. Used in TX mode

4:0

CHP_CO(4:0)

R/W

0x10

Charge pump current DAC override value,

applied when

CHP_OVERRIDE is high. Use

0x1B in TX mode.

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