CC1100-RTR1 datasheet(82/100 Pages) TI1

82 / 100 page

CC1100

SWRS038D

Page 82 of 92

0x21: FREND1 – Front End RX Configuration

Bit

Field Name

Reset

R/W

Description

7:6

LNA_CURRENT[1:0]

1 (01)

R/W

Adjusts front-end LNA PTAT current output

5:4

LNA2MIX_CURRENT[1:0]

1 (01)

R/W

Adjusts front-end PTAT outputs

3:2

LODIV_BUF_CURRENT_RX[1:0]

1 (01)

R/W

Adjusts current in RX LO buffer (LO input to mixer)

1:0

MIX_CURRENT[1:0]

2 (10)

R/W

Adjusts current in mixer

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 (0x01)

R/W

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

use in this field is given by the SmartRF® Studio software

[7].

Reserved

2:0

PA_POWER[2:0]

0 (0x00)

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. In OOK/ASK mode, this selects the PATABLE

index to use when transmitting a ‘1’. PATABLE index zero

is used in OOK/ASK when transmitting a ‘0’. The PATABLE

settings from index ‘0’ to the PA_POWER value are used for

ASK TX shaping, and 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 (0x02)

R/W

Frequency synthesizer calibration configuration. The value

to write in this field before calibration is given by the

SmartRF® Studio software.

5:4

CHP_CURR_CAL_EN[1:0]

2 (0x02)

R/W

Enable charge pump calibration stage when 1

3:0

FSCAL3[3:0]

9 (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

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