CC1010-RTR1 datasheet(132/152 Pages) TI

132 / 152 page

CC1010

SWRS047

Page 132 of 152

configured to control an external LNA,

RX/TX switch or power amplifier.

19.6 Frequency hopping spread

spectrum systems

Due to the very fast frequency shift

properties of the PLL, the

CC1010 is very

suitable for frequency hopping systems.

Hop rates of 10-1000 hops/s are usually

used depending on the bit rate and the

amount of data to be sent during each

transmission. The two frequency registers

(FREQ_A and FREQ_B) are designed such

that

the

‘next’

frequency

can

programmed while the ‘present’ frequency

is used. The switching between the two

frequencies

done

through

the

RFMAIN.F_REG control bit. Frequency

hopping improves the reliability and

increases the security of a wireless link.

The US ISM band at 902 – 928 MHz is

very

suitable

for

frequency

hopping

protocols. The FCC regulations allow the

use of transmitted output powers up to 1W

if frequency hopping is used and certain

requirements

are

met.

Please

see

application note AN001 SRD regulations

for licence free transceiver operation for

more information about this and other

radio regulations issues.

19.7 Software

Chipcon provides world-class software

support for the

CC1010.

The HAL (Hardware Abstraction Library)

library provides easy-to-use functions and

macros to access the

CC1010 hardware

without having to access SFRs directly. It

also

provides

functions

simple

communications routines.

The CUL (Chipcon Utility Library) library

contains

sophisticated

communication routines with support for

CRC

checking,

automatic

acknowledgment and retransmission.

Both libraries are supplied with full source

code, and are documented in the

CC1010

IDE User Manual.

Chipcon also supplies a wide range of

examples for the

CC1010. These examples

include simple examples, which show off

the various features of the

CC1010, as well

as examples showing RF communication

and more sophisticated application-related

examples. Source code as well as pre-

compiled HEX files are available for all

examples. A ZIP file including all examples

and documentation is available from the

Chipcon web pages. Make sure to check

the web pages regularly, as improvements

to existing examples as well as all-new

examples are added as they are available.

19.8 Development tools

Chipcon

supplies

full-featured

development kit for the

CC1010 that

includes everything you need to start and

finish your design. The development kit is

documented in the CC1010DK User

Manual.

The

development

kit

includes

evaluation version of the Keil C compiler;

this is limited to a code size of 2 kBytes. If

the

user

wishes

compile

larger

programs, a full version of the compiler

must be purchased from Keil. The Keil

development environment supports in-

circuit debugging using the second serial

port.

The

CC1010 is supported by several

compiler vendors. More information about

compiler support can be found on

Chipcon’s web pages.

19.9 PA “splattering”

In systems where the PA is turned on and

off rapidly, for example in a system that

switches rapidly between RX and TX, so-

called “splattering” may occur. This will

result in a very wide RF spectrum that may

intrude into neighbouring channels or

extend out of band. To minimise this

effect, Chipcon recommends that the

PA_POW register be used to turn the PA

gradually on and off. The optimal pattern is

to follow the sequence 0x00, 0x01, 0x1E,

0x8F, 0xEF when going from RX to TX

and consequently using 0xEF, 0x8F,

0x1E, 0x01, 0x00 when going from TX to

RX. PA_POW should be left set to 0x00 in

RX mode and 0xEF in TX mode.

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