CC2550_13 Datasheet, PDF (30/61 Pages) Texas Instruments – Low-Cost Low-Power 2.4 GHz RF Transmitter

CC2550
21 Output Power Programming
The RF output power level from the device has
two levels of programmability, as illustrated in
Figure 18.
The RF output power level from the device is
programmed through the PATABLE register.
• If 2-FSK, GFSK or MSK modulation is
used the desired output power is
programmed to index 0 in the PATABLE
register (PATABLE(0)[7:0]). The 3-bit
FREND0.PA_POWER value shall be set to 0
(reset default value).
• If OOK modulation is used the desired
output power for the logic 0 and logic 1
power levels are programmed to index 0
and index 1 in the PATABLE register
respectively (PATABLE(0)[7:0] and
PATABLE(1)[7:0]).
The
3-bit
FREND0.PA_POWER value shall be set to
1.
Table 20 contains recommended PATABLE
settings for various output levels and
frequency bands. See Section 10.6 on page
17 for PATABLE programming details. The
SmartRF^® Studio software [4] should be used
to obtain optimum PATABLE settings for
various output powers.
PATABLE must be programmed in burst mode
if writing to other entries than PATABLE(0)
(OOK modulation). Note that all content of the
PATABLE is lost when entering the SLEEP
state.
Figure 18: PA_POWER and PATABLE
SWRS039B
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