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參數(shù)資料
| 型號： | 1200 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC20 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, QLP-20 |
| 文件頁數(shù)： | 30/70頁 |
| 文件大小： | 841K |
| 代理商： | 1200 |
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Chipcon
SmartRF CC1100
Chipcon AS
SmartRF
CC1100 Preliminary Data Sheet (rev. 1.0) 2005-04-25
Page 36 of 68
that the absolute maximum ratings and
are not exceeded. The voltage regulator for
the
digital
core
requires
one
external
decoupling capacitor.
Setting the CSn pin low turns on the voltage
regulator to the digital core and starts the
crystal oscillator. The SO pin on the SPI
interface must go low before using the serial
interface (setup time is TBD).
On initial power up, the MCU must set CSn low
and issue the reset command strobe SRES.
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
CC1100.
32 Output Power Programming
The RF output power level from the device has
two levels of programmability, as illustrated in
Figure 15. Firstly, the special PATABLE
register can hold up to eight user selected
output power settings. Secondly, the 3-bit
value
selects
the
PATABLE
entry
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. In each case, all the PA power
settings in the PATABLE from index 0 up to the
value are used.
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 ASK/OOK
modulation.
The SmartRF
Studio software
should be used to
get optimum
PATABLE settings
for various output
powers.
Figure 15: PA_POWER and PATABLE
The power ramping at the start and at the end
of a packet can be turned off by setting
to
zero
and
then
programming the desired output power to
index zero in the PATABLE.
Table 24 contains recommended PATABLE
settings
for
various
output
levels
and
for PATABLE programming details.
Table 25 contains output power and current
consumption for default PATABLE setting
(0xC6).
With ASK modulation, the 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
and 0 respectively. This
counter value is used as an index for a lookup
in the power table. 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 the
PATABLE
.
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