CC1021-RTR1 datasheet(64/92 Pages) TI

64 / 92 page

CC1021

SWRS045

Page 64 of 91

Precaution should be used when placing

the microcontroller in order to avoid noise

interfering with the RF circuitry.

The recommended CC1021 PCB layout is

the

same

for

the

CC1020. A

CC1020/1070DK Development Kit with a

fully assembled CC1020EMX Evaluation

Module is available. It is strongly advised

that this reference layout is followed very

closely in

order

get

the

best

performance. The layout Gerber files are

available from the Chipcon web site.

25.

Antenna Considerations

CC1021 can be used together with various

types of antennas. The most common

antennas for short-range communication

are monopole, helical and loop antennas.

Monopole

antennas

are

resonant

antennas with a length corresponding to

one quarter of the electrical wavelength

(λ/4). They are very easy to design and

can be implemented simply as a ìpiece of

wireî or even integrated onto the PCB.

Non-resonant monopole antennas shorter

than λ/4 can also be used, but at the

expense of range. In size and cost critical

applications such an antenna may very

well be integrated onto the PCB.

Helical antennas can be thought of as a

combination of a monopole and a loop

antenna. They are a good compromise in

size critical applications. But helical

antennas tend to be more difficult to

optimize than the simple monopole.

Loop antennas are easy to integrate into

the PCB, but are less effective due to

difficult impedance matching because of

their very low radiation resistance.

For low power applications the λ/4-

monopole antenna is recommended due

to its simplicity as well as providing the

best range.

The length of the λ/4-monopole antenna is

given by:

L = 7125 / f

where f is in MHz, giving the length in cm.

An antenna for 868 MHz should be 8.2

cm, and 16.4 cm for 433 MHz.

The antenna should be connected as

close as possible to the IC. If the antenna

is located away from the input pin the

antenna should be matched to the feeding

transmission line (50 Ω).

For a more thorough background on

antennas, please refer to Application Note

AN003 SRD Antennas available from the

Chipcon web site.

26.

Configuration Registers

The configuration of CC1021 is done by

programming

the

8-bit

configuration

registers. The configuration data based on

selected system parameters are most

easily found by using the SmartRF Studio

software. Complete descriptions of the

registers are given in the following tables.

After a RESET is programmed, all the

registers have default values. The TEST

registers also get default values after a

RESET, and should not be altered by the

user.

Chipcon recommends using the register

settings found using the SmartRF Studio

software. These are the register settings

that Chipcon can guarantee across

temperature, voltage and process. Please

check the Chipcon web site for regularly

updates to the SmartRF Studio software.

CC1021-RTR1 Datasheet(PDF) 64 Page - Texas Instruments

CC1021-RTR1 Datasheet(HTML) 64 Page - Texas Instruments

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