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

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