CC2430-RTR1-F32Z datasheet(187/234 Pages) TI

187 / 234 page

CC2430

CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A

Page 187 of 232

buffer data at its own speed, reducing the

workload and timing requirements. DMA

transfers may be used to efficiently move

data to and from the radio FIFOs.

The relatively high data rate of

CC2430

also

reduces

the

average

power

consumption compared to the 868 / 915

MHz bands defined by [1], where only 20 /

40 kbps are available.

CC2430 may be

powered up a smaller portion of the time,

so that the average power consumption is

reduced for a given amount of data to be

transferred.

14.31.4 Crystal accuracy and drift

A crystal accuracy of ±40 ppm is required

for compliance with IEEE 802.15.4 [1].

This accuracy must also take ageing and

temperature drift into consideration.

A crystal with low temperature drift and

low aging could be used without further

compensation. A trimmer capacitor in the

crystal oscillator circuit (in parallel with

C191 in Figure 6) could be used to set the

initial frequency accurately.

For non-IEEE 802.15.4 systems, the

robust demodulator in

CC2430 allows up to

120 ppm total frequency offset between

the transmitter and receiver. This could

e.g. relax the accuracy requirement to 60

ppm for each of the devices.

Optionally in a star network topology, the

FFD could be equipped with a more

accurate crystal thereby relaxing the

requirement on the RFD. This can make

sense in systems where the RFDs ship in

higher volumes than the FFDs.

14.31.5 Communication robustness

CC2430 provides very good adjacent,

alternate and co channel rejection, image

frequency

suppression

and

blocking

properties. The

CC2430 performance is

significantly better than the requirements

imposed by [1]. These are highly important

parameters for reliable operation in the 2.4

GHz band, since an increasing number of

devices/systems are using this license free

frequency band.

14.31.6 Communication security

The

hardware

encryption

and

authentication operations in

CC2430 enable

secure communication, which is required

for many applications. Security operations

require a lot of data processing, which is

costly in an 8-bit microcontroller system.

The hardware support within

CC2430

enables a high level of security with

minimum CPU processing requirements.

14.31.7 Low cost systems

As the

CC2430 provides 250 kbps multi-

channel performance without any external

filters, a very low cost system can be

made (e.g. two layer PCB with single-

sided component mounting).

A differential antenna will eliminate the

need for a balun, and the DC biasing can

be achieved in the antenna topology.

14.31.8 Battery operated systems

In low power applications, the

CC2430

should be placed in the low-power modes

PM2 or PM3 when not being active. Ultra

low power consumption may be achieved

since the voltage regulators are turned off.

14.31.9 BER / PER measurements

CC2430 includes test modes where data is

received infinitely and output to pins. The

required test modes are selected with the

bits

MDMCTRL1L.TX_MODE[1:0]

and

MDMCTRL1L.RX_MODE[1:0].

These

modes may be used for Bit Error Rate

(BER)

measurements.

However,

the

following precautions must be taken to

perform such a measurement:

•

A preamble and SFD sequence

must be used, even if pseudo

random data is transmitted, since

receiving the DSSS modulated

signal

requires

symbol

synchronization,

not

bit

synchronization like e.g. in 2FSK

systems.

The

SYNCWORDH:SYNCWORDL may be

set to another value to fit to the

measurement setup if necessary.

•

The data transmitted over air must

be spread according to [1] and the

description on page 165. This

means that the transmitter used

during measurements must be

able to do spreading of the bit

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