CC1100ERGPR datasheet(59/97 Pages) TI

59 / 97 page

CC1100E

SWRS082

Page 59 of 92

28.5

Low Cost Systems

As the

CC1100E provides 1.2 - 500 kBaud multi-

channel performance without any external

SAW or loop filters, a very low cost system

can be made.

A HC-49 type SMD crystal is used in the

CC1100E EM reference designs ([3] and 0).

The crystal package strongly influences the

price. In a size constrained PCB design, a

smaller, but more expensive, crystal may be

used.

28.6

Battery Operated Systems

In low power applications, the SLEEP state

with the crystal oscillator core switched off

should be used when the

CC1100E

is not

active. It is possible to leave the crystal

oscillator core running in the SLEEP state if

start-up time is critical. The WOR functionality

should be used in low power applications.

28.7

Increasing Output Power

In some applications it may be necessary to

extend the link range. Adding an external

power amplifier is the most effective way of

doing this. The power amplifier should be

inserted between the antenna and the balun

and matching circuit. Two T/R switches are

needed to disconnect the PA in RX mode, see

details in Figure 28.

Figure 28: Block Diagram of the

CC1100E Usage with External Power Amplifier

29 Configuration Registers

The configuration of the

CC1100E is done by

programming 8-bit registers. The optimum

configuration data based on selected system

parameters are most easily found by using the

SmartRF



Studio

software

[8].

Complete

descriptions of the registers are given in the

following tables. After chip reset, all the

registers have default values as shown in the

tables. The optimum register setting might

differ from the default value. After a reset, all

registers that shall be different from the default

value therefore needs to be programmed

through the SPI interface.

There are 13 command strobe registers, listed

in Table 38. Accessing these registers will

initiate the change of an internal state or

mode. There are 47 normal 8-bit configuration

registers listed in Table 39. Many of these

registers are for test purposes only, and need

not be written for normal operation of the

CC1100E.

There are also 12 status registers that are

listed in Table 40. These registers, which are

read-only, contain information about the status

of the

CC1100E.

The two FIFOs are accessed through one 8-bit

while read operations read from the RX FIFO.

During the header byte transfer and while

writing data to a register or the TX FIFO, a

status byte is returned on the SO line. This

status byte is described in Table 21 on page

27.

CC1100E

Balun

and

Matching

Filter

Antenna

T/R

switch

T/R

switch

CC1100ERGPR Datasheet(PDF) 59 Page - Texas Instruments

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