Single-Chip Low Power RF Transceiver for Narrowband Systems ...
Single-Chip Low Power RF Transceiver for Narrowband Systems ...
Single-Chip Low Power RF Transceiver for Narrowband Systems ...
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WakeupCC1020ToRx<br />
SetupCC1020Rx<br />
SetupCC1020PD<br />
<strong>Power</strong> Down mode<br />
Turn on crystal oscillator c ore<br />
MAIN: PD_MODE=1, FS _PD=1, XOSC_PD=0, BIAS_PD=1<br />
Wait 1.2 ms*<br />
Turn on bias generator. MAIN: BIAS_PD=0<br />
Wait 150 us<br />
Turn on frequency synthesizer<br />
MAIN: RXTX=0, F_REG=0, FS_PD=0<br />
Wait until lock detected from LOCK pin<br />
or STATUS register<br />
Turn on RX: MAIN: PD_MODE = 0<br />
18. On-Off Keying (OOK)<br />
RX TX<br />
RX or TX?<br />
CC1021<br />
*Time to wait depends<br />
on the crystal frequency<br />
and the load capacitance<br />
Wait until lock detected from LOCK pin<br />
or STATUS register<br />
Turn on TX: MAIN: PD_MODE = 0<br />
Set PA_POWER<br />
RX mode TX mode<br />
Turn off RX/TX:<br />
MAIN: PD_MODE = 1, FS_PD=1,<br />
XOSC_PD=1, BIAS_ PD=1<br />
PA_POWER=00h<br />
<strong>Power</strong> Down mode<br />
Turn on frequency synthesizer<br />
MAIN: RXTX=1, F_REG=1, FS_PD=0<br />
Figure 31. Sequence <strong>for</strong> activating<br />
RX or TX mode<br />
The data modulator can also provide OOK<br />
(On-Off Keying) modulation. OOK is an<br />
ASK (Amplitude Shift Keying) modulation<br />
using<br />
100% modulation depth. OOK<br />
modulation is enabled in RX and in TX by<br />
setting TXDEV_M[3:0] = 0000 in the<br />
WakeupCC1020ToTx<br />
SetupCC1020Tx<br />
SetupCC1020PD<br />
DEVIATION register. An OOK eye<br />
diagram is shown in Figure<br />
32.<br />
The data demodulator can also per<strong>for</strong>m<br />
OOK demodulation.<br />
The demodulation is<br />
done by<br />
comparing the signal level with<br />
SWRS045B Page 56 of 89
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