CC2500-RTR1 datasheet(42/84 Pages) TI

42 / 84 page

CC2500

PRELIMINARY Data Sheet (Rev.1.2)

SWRS040A

Page 42 of 83

If the chip is programmed to enter power-down

mode, (SPWD strobe issued), the power will be

turned off after CSn goes high. The power and

crystal oscillator will be turned on again when

CSn

goes low.

The voltage regulator output should only be

used for driving the

CC2500.

24 Output Power Programming

The RF output power level from the device has

two levels of programmability, as illustrated in

Figure 21. Firstly, the special PATABLE

output power settings. Secondly, the 3-bit

FREND0.PA_POWER

value

selects

the

PATABLE

entry

use.

This

two-level

functionality provides flexible PA power ramp

up and ramp down at the start and end of

transmission. All the PA power settings in the

PATABLE

from

index

the

FREND0.PA_POWER

value are used.

The power ramping at the start and at the end

of a packet can be turned off by setting

FREND0.PA_POWER

to 0 and then program

the desired output power to index 0 in the

PATABLE

Table 31 contains recommended PATABLE

settings

for

various

output

levels

and

frequency bands. See Section 10.6 on page

23 for PATABLE programming details.

PATABLE

must be programmed in burst mode

if you want to write to other entries than

PATABLE[0].

e.g 6

PA_POWER[2:0]

in FREND0 register

PATABLE(0)[7:0]

PATABLE(1)[7:0]

PATABLE(2)[7:0]

PATABLE(3)[7:0]

PATABLE(4)[7:0]

PATABLE(5)[7:0]

PATABLE(6)[7:0]

PATABLE(7)[7:0]

Index into PATABLE(7:0)

The PA uses this

setting.

Settings 0 to PA_POWER are

used during ramp-up at start of

transmission and ramp-down at

end of transmission, and for

OOK modulation.

The SmartRF® Studio software

should be used to obtain optimum

PATABLE settings for various

output powers.

Figure 21: PA_POWER and PATABLE

Default power setting

Output power,

typical [dBm]

Current consumption,

typical [mA]

0xC6

-11.8

11.1

Table 30: Output power and current consumption for default PATABLE setting

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