CC2550-RTY1 datasheet(28/55 Pages) TI

28 / 55 page

CC2550

PRELIMINARY Data Sheet (Rev.1.2)

SWRS039A

Page 28 of 54

Output Power Programming

The RF output power level from the device has

two levels of programmability, as illustrated in

Figure 18. 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

and

then

programming the desired output power to

index 0 in the PATABLE.

Table 20 contains recommended PATABLE

settings

for

various

output

levels

and

frequency bands. See Section 10.6 on page

16 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 18: PA_POWER and PATABLE

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