CC1021-RTR1 datasheet(56/92 Pages) TI

56 / 92 page

CC1021

SWRS045

Page 56 of 91

Turn on crystal oscillator core

MAIN: PD_MODE=1, FS_PD=1, XOSC_PD=0, BIAS_PD=1

Wait 1.2 ms*

Power Down mode

*Time to wait depends

on the crystal frequency

and the load capacitance

Wait until lock detected from LOCK pin

or STATUS register

Turn on RX: MAIN: PD_MODE = 0

Wait until lock detected from LOCK pin

or STATUS register

Turn on TX: MAIN: PD_MODE = 0

Set PA_POWER

RX mode

TX mode

Turn off RX/TX:

MAIN: PD_MODE = 1, FS_PD=1,

XOSC_PD=1, BIAS_PD=1

PA_POWER=00h

Power Down mode

Turn on frequency synthesizer

MAIN: RXTX=0, F_REG=0, FS_PD=0

Turn on frequency synthesizer

MAIN: RXTX=1, F_REG=1, FS_PD=0

RX or TX?

Turn on bias generator. MAIN: BIAS_PD=0

Wait 150 us

Turn on crystal oscillator core

MAIN: PD_MODE=1, FS_PD=1, XOSC_PD=0, BIAS_PD=1

Wait 1.2 ms*

Power Down mode

*Time to wait depends

on the crystal frequency

and the load capacitance

Wait until lock detected from LOCK pin

or STATUS register

Turn on RX: MAIN: PD_MODE = 0

Wait until lock detected from LOCK pin

or STATUS register

Turn on TX: MAIN: PD_MODE = 0

Set PA_POWER

Wait until lock detected from LOCK pin

or STATUS register

Turn on RX: MAIN: PD_MODE = 0

Wait until lock detected from LOCK pin

or STATUS register

Turn on TX: MAIN: PD_MODE = 0

Set PA_POWER

RX mode

TX mode

RX mode

TX mode

Turn off RX/TX:

MAIN: PD_MODE = 1, FS_PD=1,

XOSC_PD=1, BIAS_PD=1

PA_POWER=00h

Power Down mode

Turn on frequency synthesizer

MAIN: RXTX=0, F_REG=0, FS_PD=0

Turn on frequency synthesizer

MAIN: RXTX=1, F_REG=1, FS_PD=0

Turn on frequency synthesizer

MAIN: RXTX=0, F_REG=0, FS_PD=0

Turn on frequency synthesizer

MAIN: RXTX=1, F_REG=1, FS_PD=0

RX or TX?

Turn on bias generator. MAIN: BIAS_PD=0

Wait 150 us

Figure 31. Sequence for activating RX or TX mode

18.

On-Off Keying (OOK)

The data modulator can also provide OOK

(On-Off Keying) modulation. OOK is an

ASK (Amplitude Shift Keying) modulation

using 100% modulation depth. OOK

modulation is enabled in RX and in TX by

setting TXDEV_M[3:0] = 0000 in the

DEVIATION

OOK

eye

diagram is shown in Figure 32.

The data demodulator can also perform

OOK demodulation. The demodulation is

done by comparing the signal level with

CC1021-RTR1 Datasheet(PDF) 56 Page - Texas Instruments

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