CC2430 Datasheet, PDF (186/234 Pages) Texas Instruments – A True System-on-Chip solution for 2.4 GHz IEEE 802.15.4 / ZigBee-TM

CC2430
Figure 55: Modulated spectrum plot
14.31 System Considerations and
Guidelines
defined by [1] to spread the output power,
thereby making the communication link
more robust even in a noisy environment.
14.31.1 SRD regulations
International regulations and national laws
regulate the use of radio receivers and
transmitters. SRDs (Short Range Devices)
for license free operation are allowed to
operate in the 2.4 GHz band worldwide.
The most important regulations are ETSI
EN 300 328 and EN 300 440 (Europe),
FCC CFR-47 part 15.247 and 15.249
(USA), and ARIB STD-T66 (Japan).
14.31.2 Frequency hopping and multi-
channel systems
With CC2430 it is also possible to combine
both DSSS and FHSS (frequency hopping
spread spectrum) in a proprietary non-
IEEE 802.15.4 system. This is achieved by
reprogramming the operating frequency
(see the Frequency and Channel
Programming section on page 183) before
enabling RX or TX. A frequency
synchronization scheme must then be
implemented within the proprietary MAC
layer to make the transmitter and receiver
operate on the same RF channel.
14.31.3 Data burst transmissions
The 2.4 GHz band is shared by many
systems both in industrial, office and home
environments. CC2430 uses direct
sequence spread spectrum (DSSS) as
The data buffering in CC2430 lets the user
have a lower data rate link between the
CPU and the radio module than the RF bit
rate of 250 kbps. This allows the CPU to
CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A
Page 186 of 232