CC2500-RTY1 datasheet(79/99 Pages) TI1

79 / 99 page

CC2500

SWRS040C

Page 79 of 89

0x22: FREND0 – Front End TX configuration

Bit

Field Name

Reset

R/W

Description

7:6

Reserved

5:4

LODIV_BUF_CURRENT_TX[1:0]

1 (01)

R/W

Adjusts current TX LO buffer (input to PA). The value to use in

this field is given by the SmartRF

 Studio software [5].

Reserved

2:0

PA_POWER[2:0]

0 (000)

R/W

Selects PA power setting. This value is an index to the

PATABLE. In OOK mode, this selects the PATABLE index to

use when transmitting a ‘1’. PATABLE index zero is used in

OOK when transmitting a ‘0’.

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].

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[4:0]

(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.

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