CC2550-RTY1 datasheet(48/62 Pages) TI2

48 / 62 page

CC2550

SWRS039B

Page 48 of 58

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 [4].

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. Digital bit vector

defining the charge pump output current, on an exponential scale:

IOUT=I0·2

FSCAL3[3:0]/4

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

VCO_CORE_H_EN

R/W

Choose high (1) / low (0) VCO

4:0

FSCAL2[5:0]

(0x0A)

R/W

Frequency synthesizer calibration result register. VCO current

calibration result and override value

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. Capacitor array

setting for VCO coarse tuning.

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 in the transceiver version

4:0

FSCAL0[4:0]

(0x0D)

R/W

Frequency synthesizer calibration control. The value to use in

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