CC2550-RTR1 datasheet(45/55 Pages) TI

45 / 55 page

CC2550

PRELIMINARY Data Sheet (Rev.1.2)

SWRS039A

Page 45 of 54

0x23: FSCAL3 – Frequency synthesizer calibration

Bit

Field Name

Reset

R/W

Description

7:6

FSCAL3[7:6]

2 (10)

R/W

Frequency synthesizer calibration configuration. The value to write

in this register before calibration is given by the SmartRF® Studio

software.

5:4

CHP_CURR_CAL_EN[1:0]

2 (10)

R/W

Disable charge pump calibration stage when 0

3:0

FSCAL3[3:0]

(1001)

R/W

Frequency synthesizer calibration result register.

Fast frequency hopping without calibration for each hop can be

done by calibrating upfront for each frequency and saving the

resulting FSCAL3, FSCAL2 and FSCAL1 register values. Between

each frequency hop, calibration can be replaced by writing the

FSCAL3, FSCAL2 and FSCAL1 register values corresponding to

the next RF frequency.

0x24: FSCAL2 – Frequency synthesizer calibration

Bit

Field Name

Reset

R/W

Description

7:6

Reserved

5:0

FSCAL2[5:0]

(0x0A)

R/W

Frequency synthesizer calibration result register.

Fast frequency hopping without calibration for each hop can be

done by calibrating upfront for each frequency and saving the

resulting FSCAL3, FSCAL2 and FSCAL1 register values. Between

each frequency hop, calibration can be replaced by writing the

FSCAL3, FSCAL2 and FSCAL1 register values corresponding to

the next RF frequency.

0x25: FSCAL1 – Frequency synthesizer calibration

Bit

Field Name

Reset

R/W

Description

7:6

Reserved

5:0

FSCAL1[5:0]

(0x20)

R/W

Frequency synthesizer calibration result register.

Fast frequency hopping without calibration for each hop can be

done by calibrating upfront for each frequency and saving the

resulting FSCAL3, FSCAL2 and FSCAL1 register values. Between

each frequency hop, calibration can be replaced by writing the

FSCAL3, FSCAL2 and FSCAL1 register values corresponding to

the next RF frequency.

0x26: FSCAL0 – Frequency synthesizer calibration

Bit

Field Name

Reset

R/W

Description

Reserved

6:5

Reserved

0 (00)

Defined on the transceiver version

4:0

FSCAL0[4:0]

(0x0D)

R/W

Frequency synthesizer calibration control. The value to use in

0x29: FSTEST – Frequency synthesizer calibration control

Bit

Field Name

Reset

R/W

Description

7:0

FSTEST[7:0]

(0x57)

R/W

For test only. Do not write to this register.

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