CC1110Fx / CC1111Fx
The calibration can be initiated automatically or
manually. The synthesizer can be
command strobe is activated in the IDLE
mode.
automatically calibrated each time the
synthesizer is turned on, or each time the
synthesizer is turned off automatically. This is
configured with the MCSM0.FS_AUTOCAL
register setting. In manual mode, the
calibration is initiated when the SCAL
Note that the calibration values are maintained
in power-down modes PM1/2/3, so the
calibration is still valid after waking up from
these power-down modes (unless supply
voltage or temperature has changed
significantly).
14.15 Output Power Programming
The RF output power level from the device has
two levels of programmability, as illustrated in
The power ramping at the start and at the end
of a packet can be turned off by setting
FREND0.PA_POWER to zero and then program
the desired output power to PA_TABLE0
register.
Figure
55.
Firstly,
the
PA_TABLE7-
PA_TABLE0registers can hold up to eight user
selected output power settings. Secondly, the
3-bit FREND0.PA_POWER value selects the
PA_TABLE7-PA_TABLE0 register to use. This
two-level functionality provides flexible PA
power ramp up and ramp down at the start and
end of transmission, as well as ASK
modulation shaping. All the PA power settings
in the PA_TABLE7-PA_TABLE0 registers,
If OOK modulation is used, the logic 0 and
logic 1 power levels shall be programmed to
index 0 and 1 respectively, i.e. PA_TABLE0
and PA_TABLE1.
Table 73 contains recommended PA_TABLE
settings for various output levels and
frequency bands. Using PA settings from 0x68
to 0x6F is not recommended.
from index
0 up to the index set by
FREND0.PA_POWER,values are used.
315 MHz
433 MHz
Current
868 MHz
Current
915 MHz
Current
Output
Power
[dBm]
Current
Setting Consumption, Setting Consumption, Setting Consumption, Setting Consumption,
Typ. [mA]
Typ. [mA]
Typ. [mA]
Typ. [mA]
-30
-20
-15
-10
-5
0x12
0x0D
0x1C
0x34
0x2B
0x51
0x85
0xCB
0xC2
14
15
16
17
19
19
22
25
31
0x12
0x0E
0x1D
0x34
0x2C
0x60
0x84
0xC8
0xC0
15
16
16
18
20
20
23
28
33
0x03
0x0E
0x1E
0x27
0x8F
0x50
0x84
0xCB
0xC2
16
17
17
19
19
21
25
31
36
0x03
0x0D
0x1D
0x26
0x57
0x8E
0x83
0xC7
0xC0
16
16
17
18
18
21
25
31
36
0
5
7
10
Table 73: Optimum PA_TABLE Settings for Various Output Power Levels and Frequency Bands
14.16 Shaping and PA Ramping
With ASK modulation, up to eight power
settings are used for shaping. The modulator
contains a counter that counts up when
transmitting a one and down when transmitting
a zero. The counter counts at a rate equal to 8
times the symbol rate. The counter saturates
at FREND0.PA_POWER and 0 respectively.
This counter value can be viewed as an index
for a lookup table in the power table (see
Figure 55). Thus, in order to utilize the whole
table, FREND0.PA_POWER should be 7 when
ASK is active. The shaping of the ASK signal
is dependent on the configuration of
PA_TABLE7-PA_TABLE0 registers. Figure 56
shows some examples of ASK shaping.
SWRS033E
Page 204 of 239
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