CC2500-RTR1 datasheet(73/84 Pages) TI

73 / 84 page

CC2500

PRELIMINARY Data Sheet (Rev.1.2)

SWRS040A

Page 73 of 83

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.

Reserved

2:0

PA_POWER[2:0]

0 (000)

R/W

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

PATABLE, which can be programmed with up to 8 different PA

settings. The PATABLE settings from index ‘0’ to the

PA_POWER value are used for power ramp-up/ramp-down at

the start/end of transmission in all TX modulation formats.

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.

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