CC1070-RTR1 datasheet(40/57 Pages) TI2

40 / 57 page

CC1070

SWRS043A

Page 40 of 54

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

TI web site.

24 Configuration Registers

The configuration of

CC1070 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.

TI recommends using the register settings

found

using

the

SmartRF®

Studio

software. These are the register settings

that TI specifies across temperature,

voltage and process. Please check the TI

web site for regularly updates to the

SmartRF® Studio software.

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