CC2500 datasheet(49/76 Pages) TI

49 / 76 page

CC2500

Preliminary Data Sheet (rev.1.1.)

SWRS040

Page 49 of 77

transmitted in the same bandwidth using

GFSK.

30.7 Low Cost Systems

As the

CC2500 provides 500 kbps multi-

channel performance without any external

filters, a very low cost system can be made.

A differential antenna will eliminate the need

for a balun, and the DC biasing can be

achieved in the antenna topology, see Figure

A HC-49 type SMD crystal is used in the

CC2500EM reference design. Note that the

crystal package strongly influences the price.

In a size constrained PCB design a smaller,

but more expensive, crystal may be used.

30.8 Battery Operated Systems

In low power applications, the SLEEP state

with the crystal oscillator core switched off

should be used when the

CC2500 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.

30.9 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 two

T/R switches are needed to disconnect the PA

in RX mode. See Figure 23.

Figure 23. Block diagram of

CC2500 usage with external power amplifier

31 Configuration Registers

The configuration of

CC2500 is done by

programming 8-bit 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

chip reset, all the registers have default values

as shown in the tables.

There are 14 Command Strobe Registers,

listed in Table 34. Accessing these registers

will initiate the change of an internal state or

mode. There are 47 normal 8-bit Configuration

Registers, listed in Table 35. Many of these

registers are for test purposes only, and need

not be written for normal operation of

CC2500.

There are also 12 Status registers, which are

listed in Table 36. These registers, which are

read-only, contain information about the status

CC2500.

The two FIFOs are accessed through one 8-bit

while read operations read from the RX FIFO.

During the address transfer and while writing

to a register or the TX FIFO, a status byte is

CC2500

Balun

Filter

Antenna

T/R switch

CC2500 Datasheet(PDF) 49 Page - Texas Instruments

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